text: // manifesto v2.2.21 https://github.com/iiif-commons/manifesto
  (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.manifesto = f()}})(function(){var define,module,exports;return (function(){function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s}return e})()({1:[function(require,module,exports){
  (function (global){
  
  var Manifesto;
  (function (Manifesto) {
      var StringValue = /** @class */ (function () {
          function StringValue(value) {
              this.value = "";
              if (value) {
                  this.value = value.toLowerCase();
              }
          }
          StringValue.prototype.toString = function () {
              return this.value;
          };
          return StringValue;
      }());
      Manifesto.StringValue = StringValue;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var AnnotationMotivation = /** @class */ (function (_super) {
          __extends(AnnotationMotivation, _super);
          function AnnotationMotivation() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          AnnotationMotivation.prototype.bookmarking = function () {
              return new AnnotationMotivation(AnnotationMotivation.BOOKMARKING.toString());
          };
          AnnotationMotivation.prototype.classifying = function () {
              return new AnnotationMotivation(AnnotationMotivation.CLASSIFYING.toString());
          };
          AnnotationMotivation.prototype.commenting = function () {
              return new AnnotationMotivation(AnnotationMotivation.COMMENTING.toString());
          };
          AnnotationMotivation.prototype.describing = function () {
              return new AnnotationMotivation(AnnotationMotivation.DESCRIBING.toString());
          };
          AnnotationMotivation.prototype.editing = function () {
              return new AnnotationMotivation(AnnotationMotivation.EDITING.toString());
          };
          AnnotationMotivation.prototype.highlighting = function () {
              return new AnnotationMotivation(AnnotationMotivation.HIGHLIGHTING.toString());
          };
          AnnotationMotivation.prototype.identifying = function () {
              return new AnnotationMotivation(AnnotationMotivation.IDENTIFYING.toString());
          };
          AnnotationMotivation.prototype.linking = function () {
              return new AnnotationMotivation(AnnotationMotivation.LINKING.toString());
          };
          AnnotationMotivation.prototype.moderating = function () {
              return new AnnotationMotivation(AnnotationMotivation.MODERATING.toString());
          };
          AnnotationMotivation.prototype.painting = function () {
              return new AnnotationMotivation(AnnotationMotivation.PAINTING.toString());
          };
          AnnotationMotivation.prototype.questioning = function () {
              return new AnnotationMotivation(AnnotationMotivation.QUESTIONING.toString());
          };
          AnnotationMotivation.prototype.replying = function () {
              return new AnnotationMotivation(AnnotationMotivation.REPLYING.toString());
          };
          AnnotationMotivation.prototype.tagging = function () {
              return new AnnotationMotivation(AnnotationMotivation.TAGGING.toString());
          };
          AnnotationMotivation.prototype.transcribing = function () {
              return new AnnotationMotivation(AnnotationMotivation.TRANSCRIBING.toString());
          };
          AnnotationMotivation.BOOKMARKING = new AnnotationMotivation("oa:bookmarking");
          AnnotationMotivation.CLASSIFYING = new AnnotationMotivation("oa:classifying");
          AnnotationMotivation.COMMENTING = new AnnotationMotivation("oa:commenting");
          AnnotationMotivation.DESCRIBING = new AnnotationMotivation("oa:describing");
          AnnotationMotivation.EDITING = new AnnotationMotivation("oa:editing");
          AnnotationMotivation.HIGHLIGHTING = new AnnotationMotivation("oa:highlighting");
          AnnotationMotivation.IDENTIFYING = new AnnotationMotivation("oa:identifying");
          AnnotationMotivation.LINKING = new AnnotationMotivation("oa:linking");
          AnnotationMotivation.MODERATING = new AnnotationMotivation("oa:moderating");
          AnnotationMotivation.PAINTING = new AnnotationMotivation("sc:painting");
          AnnotationMotivation.QUESTIONING = new AnnotationMotivation("oa:questioning");
          AnnotationMotivation.REPLYING = new AnnotationMotivation("oa:replying");
          AnnotationMotivation.TAGGING = new AnnotationMotivation("oa:tagging");
          AnnotationMotivation.TRANSCRIBING = new AnnotationMotivation("oad:transcribing");
          return AnnotationMotivation;
      }(Manifesto.StringValue));
      Manifesto.AnnotationMotivation = AnnotationMotivation;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Behavior = /** @class */ (function (_super) {
          __extends(Behavior, _super);
          function Behavior() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          Behavior.prototype.autoadvance = function () {
              return new Behavior(Behavior.AUTOADVANCE.toString());
          };
          Behavior.prototype.nonav = function () {
              return new Behavior(Behavior.NONAV.toString());
          };
          Behavior.AUTOADVANCE = new Behavior("auto-advance");
          Behavior.NONAV = new Behavior("no-nav");
          return Behavior;
      }(Manifesto.StringValue));
      Manifesto.Behavior = Behavior;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var IIIFResourceType = /** @class */ (function (_super) {
          __extends(IIIFResourceType, _super);
          function IIIFResourceType() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          IIIFResourceType.prototype.annotation = function () {
              return new IIIFResourceType(IIIFResourceType.ANNOTATION.toString());
          };
          IIIFResourceType.prototype.canvas = function () {
              return new IIIFResourceType(IIIFResourceType.CANVAS.toString());
          };
          IIIFResourceType.prototype.collection = function () {
              return new IIIFResourceType(IIIFResourceType.COLLECTION.toString());
          };
          IIIFResourceType.prototype.manifest = function () {
              return new IIIFResourceType(IIIFResourceType.MANIFEST.toString());
          };
          IIIFResourceType.prototype.range = function () {
              return new IIIFResourceType(IIIFResourceType.RANGE.toString());
          };
          IIIFResourceType.prototype.sequence = function () {
              return new IIIFResourceType(IIIFResourceType.SEQUENCE.toString());
          };
          IIIFResourceType.ANNOTATION = new IIIFResourceType("annotation");
          IIIFResourceType.CANVAS = new IIIFResourceType("canvas");
          IIIFResourceType.COLLECTION = new IIIFResourceType("collection");
          IIIFResourceType.MANIFEST = new IIIFResourceType("manifest");
          IIIFResourceType.RANGE = new IIIFResourceType("range");
          IIIFResourceType.SEQUENCE = new IIIFResourceType("sequence");
          return IIIFResourceType;
      }(Manifesto.StringValue));
      Manifesto.IIIFResourceType = IIIFResourceType;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var ManifestType = /** @class */ (function (_super) {
          __extends(ManifestType, _super);
          function ManifestType() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          ManifestType.prototype.empty = function () {
              return new ManifestType(ManifestType.EMPTY.toString());
          };
          ManifestType.prototype.manuscript = function () {
              return new ManifestType(ManifestType.MANUSCRIPT.toString());
          };
          ManifestType.prototype.monograph = function () {
              return new ManifestType(ManifestType.MONOGRAPH.toString());
          };
          ManifestType.EMPTY = new ManifestType("");
          ManifestType.MANUSCRIPT = new ManifestType("manuscript");
          ManifestType.MONOGRAPH = new ManifestType("monograph");
          return ManifestType;
      }(Manifesto.StringValue));
      Manifesto.ManifestType = ManifestType;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var RenderingFormat = /** @class */ (function (_super) {
          __extends(RenderingFormat, _super);
          function RenderingFormat() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          RenderingFormat.prototype.pdf = function () {
              return new RenderingFormat(RenderingFormat.PDF.toString());
          };
          RenderingFormat.prototype.doc = function () {
              return new RenderingFormat(RenderingFormat.DOC.toString());
          };
          RenderingFormat.prototype.docx = function () {
              return new RenderingFormat(RenderingFormat.DOCX.toString());
          };
          RenderingFormat.PDF = new RenderingFormat("application/pdf");
          RenderingFormat.DOC = new RenderingFormat("application/msword");
          RenderingFormat.DOCX = new RenderingFormat("application/vnd.openxmlformats-officedocument.wordprocessingml.document");
          return RenderingFormat;
      }(Manifesto.StringValue));
      Manifesto.RenderingFormat = RenderingFormat;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var MediaType = /** @class */ (function (_super) {
          __extends(MediaType, _super);
          function MediaType() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          MediaType.prototype.jpg = function () {
              return new MediaType(MediaType.JPG.toString());
          };
          MediaType.prototype.mp4 = function () {
              return new MediaType(MediaType.MP4.toString());
          };
          MediaType.prototype.pdf = function () {
              return new MediaType(MediaType.PDF.toString());
          };
          MediaType.prototype.threejs = function () {
              return new MediaType(MediaType.THREEJS.toString());
          };
          MediaType.prototype.webm = function () {
              return new MediaType(MediaType.WEBM.toString());
          };
          MediaType.JPG = new MediaType("image/jpeg");
          MediaType.MP4 = new MediaType("video/mp4");
          MediaType.PDF = new MediaType("application/pdf");
          MediaType.THREEJS = new MediaType("application/vnd.threejs+json");
          MediaType.WEBM = new MediaType("video/webm");
          return MediaType;
      }(Manifesto.StringValue));
      Manifesto.MediaType = MediaType;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var ResourceType = /** @class */ (function (_super) {
          __extends(ResourceType, _super);
          function ResourceType() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          ResourceType.prototype.canvas = function () {
              return new ResourceType(ResourceType.CANVAS.toString());
          };
          ResourceType.prototype.choice = function () {
              return new ResourceType(ResourceType.CHOICE.toString());
          };
          ResourceType.prototype.document = function () {
              return new ResourceType(ResourceType.DOCUMENT.toString());
          };
          ResourceType.prototype.image = function () {
              return new ResourceType(ResourceType.IMAGE.toString());
          };
          ResourceType.prototype.movingimage = function () {
              return new ResourceType(ResourceType.MOVINGIMAGE.toString());
          };
          ResourceType.prototype.physicalobject = function () {
              return new ResourceType(ResourceType.PHYSICALOBJECT.toString());
          };
          ResourceType.prototype.sound = function () {
              return new ResourceType(ResourceType.SOUND.toString());
          };
          ResourceType.prototype.text = function () {
              return new ResourceType(ResourceType.TEXT.toString());
          };
          ResourceType.CANVAS = new ResourceType("canvas");
          ResourceType.CHOICE = new ResourceType("choice");
          ResourceType.DOCUMENT = new ResourceType("document");
          ResourceType.IMAGE = new ResourceType("image");
          ResourceType.MOVINGIMAGE = new ResourceType("movingimage");
          ResourceType.PHYSICALOBJECT = new ResourceType("physicalobject");
          ResourceType.SOUND = new ResourceType("sound");
          ResourceType.TEXT = new ResourceType("textualbody");
          return ResourceType;
      }(Manifesto.StringValue));
      Manifesto.ResourceType = ResourceType;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var ServiceProfile = /** @class */ (function (_super) {
          __extends(ServiceProfile, _super);
          function ServiceProfile() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          ServiceProfile.prototype.auth1Clickthrough = function () {
              return new ServiceProfile(ServiceProfile.AUTH1CLICKTHROUGH.toString());
          };
          ServiceProfile.prototype.auth1External = function () {
              return new ServiceProfile(ServiceProfile.AUTH1EXTERNAL.toString());
          };
          ServiceProfile.prototype.auth1Kiosk = function () {
              return new ServiceProfile(ServiceProfile.AUTH1KIOSK.toString());
          };
          ServiceProfile.prototype.auth1Login = function () {
              return new ServiceProfile(ServiceProfile.AUTH1LOGIN.toString());
          };
          ServiceProfile.prototype.auth1Logout = function () {
              return new ServiceProfile(ServiceProfile.AUTH1LOGOUT.toString());
          };
          ServiceProfile.prototype.auth1Token = function () {
              return new ServiceProfile(ServiceProfile.AUTH1TOKEN.toString());
          };
          ServiceProfile.prototype.autoComplete = function () {
              return new ServiceProfile(ServiceProfile.AUTOCOMPLETE.toString());
          };
          ServiceProfile.prototype.iiif1ImageLevel1 = function () {
              return new ServiceProfile(ServiceProfile.IIIF1IMAGELEVEL1.toString());
          };
          ServiceProfile.prototype.iiif1ImageLevel2 = function () {
              return new ServiceProfile(ServiceProfile.IIIF1IMAGELEVEL2.toString());
          };
          ServiceProfile.prototype.iiif2ImageLevel1 = function () {
              return new ServiceProfile(ServiceProfile.IIIF2IMAGELEVEL1.toString());
          };
          ServiceProfile.prototype.iiif2ImageLevel2 = function () {
              return new ServiceProfile(ServiceProfile.IIIF2IMAGELEVEL2.toString());
          };
          ServiceProfile.prototype.ixif = function () {
              return new ServiceProfile(ServiceProfile.IXIF.toString());
          };
          ServiceProfile.prototype.login = function () {
              return new ServiceProfile(ServiceProfile.AUTHLOGIN.toString());
          };
          ServiceProfile.prototype.clickThrough = function () {
              return new ServiceProfile(ServiceProfile.AUTHCLICKTHROUGH.toString());
          };
          ServiceProfile.prototype.restricted = function () {
              return new ServiceProfile(ServiceProfile.AUTHRESTRICTED.toString());
          };
          ServiceProfile.prototype.logout = function () {
              return new ServiceProfile(ServiceProfile.AUTHLOGOUT.toString());
          };
          ServiceProfile.prototype.otherManifestations = function () {
              return new ServiceProfile(ServiceProfile.OTHERMANIFESTATIONS.toString());
          };
          ServiceProfile.prototype.search = function () {
              return new ServiceProfile(ServiceProfile.SEARCH.toString());
          };
          ServiceProfile.prototype.stanfordIIIFImageCompliance1 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE1.toString());
          };
          ServiceProfile.prototype.stanfordIIIFImageCompliance2 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE2.toString());
          };
          ServiceProfile.prototype.stanfordIIIFImageConformance1 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIFIMAGECONFORMANCE1.toString());
          };
          ServiceProfile.prototype.stanfordIIIFImageConformance2 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIFIMAGECONFORMANCE2.toString());
          };
          ServiceProfile.prototype.stanfordIIIF1ImageCompliance1 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE1.toString());
          };
          ServiceProfile.prototype.stanfordIIIF1ImageCompliance2 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE2.toString());
          };
          ServiceProfile.prototype.stanfordIIIF1ImageConformance1 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE1.toString());
          };
          ServiceProfile.prototype.stanfordIIIF1ImageConformance2 = function () {
              return new ServiceProfile(ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE2.toString());
          };
          ServiceProfile.prototype.token = function () {
              return new ServiceProfile(ServiceProfile.AUTHTOKEN.toString());
          };
          ServiceProfile.prototype.trackingExtensions = function () {
              return new ServiceProfile(ServiceProfile.TRACKINGEXTENSIONS.toString());
          };
          ServiceProfile.prototype.uiExtensions = function () {
              return new ServiceProfile(ServiceProfile.UIEXTENSIONS.toString());
          };
          ServiceProfile.prototype.printExtensions = function () {
              return new ServiceProfile(ServiceProfile.PRINTEXTENSIONS.toString());
          };
          ServiceProfile.prototype.shareExtensions = function () {
              return new ServiceProfile(ServiceProfile.SHAREEXTENSIONS.toString());
          };
          // image api
          ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE0 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/compliance.html#level0");
          ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE1 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/compliance.html#level1");
          ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE2 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/compliance.html#level2");
          ServiceProfile.STANFORDIIIFIMAGECONFORMANCE0 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/conformance.html#level0");
          ServiceProfile.STANFORDIIIFIMAGECONFORMANCE1 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/conformance.html#level1");
          ServiceProfile.STANFORDIIIFIMAGECONFORMANCE2 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/conformance.html#level2");
          ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE0 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level0");
          ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE1 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level1");
          ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE2 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level2");
          ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE0 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/1.1/conformance.html#level0");
          ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE1 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/1.1/conformance.html#level1");
          ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE2 = new ServiceProfile("http://library.stanford.edu/iiif/image-api/1.1/conformance.html#level2");
          ServiceProfile.IIIF1IMAGELEVEL0 = new ServiceProfile("http://iiif.io/api/image/1/level0.json");
          ServiceProfile.IIIF1IMAGELEVEL0PROFILE = new ServiceProfile("http://iiif.io/api/image/1/profiles/level0.json");
          ServiceProfile.IIIF1IMAGELEVEL1 = new ServiceProfile("http://iiif.io/api/image/1/level1.json");
          ServiceProfile.IIIF1IMAGELEVEL1PROFILE = new ServiceProfile("http://iiif.io/api/image/1/profiles/level1.json");
          ServiceProfile.IIIF1IMAGELEVEL2 = new ServiceProfile("http://iiif.io/api/image/1/level2.json");
          ServiceProfile.IIIF1IMAGELEVEL2PROFILE = new ServiceProfile("http://iiif.io/api/image/1/profiles/level2.json");
          ServiceProfile.IIIF2IMAGELEVEL0 = new ServiceProfile("http://iiif.io/api/image/2/level0.json");
          ServiceProfile.IIIF2IMAGELEVEL0PROFILE = new ServiceProfile("http://iiif.io/api/image/2/profiles/level0.json");
          ServiceProfile.IIIF2IMAGELEVEL1 = new ServiceProfile("http://iiif.io/api/image/2/level1.json");
          ServiceProfile.IIIF2IMAGELEVEL1PROFILE = new ServiceProfile("http://iiif.io/api/image/2/profiles/level1.json");
          ServiceProfile.IIIF2IMAGELEVEL2 = new ServiceProfile("http://iiif.io/api/image/2/level2.json");
          ServiceProfile.IIIF2IMAGELEVEL2PROFILE = new ServiceProfile("http://iiif.io/api/image/2/profiles/level2.json");
          // auth api
          ServiceProfile.AUTHCLICKTHROUGH = new ServiceProfile("http://iiif.io/api/auth/0/login/clickthrough");
          ServiceProfile.AUTHLOGIN = new ServiceProfile("http://iiif.io/api/auth/0/login");
          ServiceProfile.AUTHLOGOUT = new ServiceProfile("http://iiif.io/api/auth/0/logout");
          ServiceProfile.AUTHRESTRICTED = new ServiceProfile("http://iiif.io/api/auth/0/login/restricted");
          ServiceProfile.AUTHTOKEN = new ServiceProfile("http://iiif.io/api/auth/0/token");
          ServiceProfile.AUTH1CLICKTHROUGH = new ServiceProfile("http://iiif.io/api/auth/1/clickthrough");
          ServiceProfile.AUTH1EXTERNAL = new ServiceProfile("http://iiif.io/api/auth/1/external");
          ServiceProfile.AUTH1KIOSK = new ServiceProfile("http://iiif.io/api/auth/1/kiosk");
          ServiceProfile.AUTH1LOGIN = new ServiceProfile("http://iiif.io/api/auth/1/login");
          ServiceProfile.AUTH1LOGOUT = new ServiceProfile("http://iiif.io/api/auth/1/logout");
          ServiceProfile.AUTH1TOKEN = new ServiceProfile("http://iiif.io/api/auth/1/token");
          // search api
          ServiceProfile.AUTOCOMPLETE = new ServiceProfile("http://iiif.io/api/search/0/autocomplete");
          ServiceProfile.SEARCH = new ServiceProfile("http://iiif.io/api/search/0/search");
          // extensions
          ServiceProfile.TRACKINGEXTENSIONS = new ServiceProfile("http://universalviewer.io/tracking-extensions-profile");
          ServiceProfile.UIEXTENSIONS = new ServiceProfile("http://universalviewer.io/ui-extensions-profile");
          ServiceProfile.PRINTEXTENSIONS = new ServiceProfile("http://universalviewer.io/print-extensions-profile");
          ServiceProfile.SHAREEXTENSIONS = new ServiceProfile("http://universalviewer.io/share-extensions-profile");
          // other
          ServiceProfile.OTHERMANIFESTATIONS = new ServiceProfile("http://iiif.io/api/otherManifestations.json");
          ServiceProfile.IXIF = new ServiceProfile("http://wellcomelibrary.org/ld/ixif/0/alpha.json");
          return ServiceProfile;
      }(Manifesto.StringValue));
      Manifesto.ServiceProfile = ServiceProfile;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var ViewingDirection = /** @class */ (function (_super) {
          __extends(ViewingDirection, _super);
          function ViewingDirection() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          ViewingDirection.prototype.leftToRight = function () {
              return new ViewingDirection(ViewingDirection.LEFTTORIGHT.toString());
          };
          ViewingDirection.prototype.rightToLeft = function () {
              return new ViewingDirection(ViewingDirection.RIGHTTOLEFT.toString());
          };
          ViewingDirection.prototype.topToBottom = function () {
              return new ViewingDirection(ViewingDirection.TOPTOBOTTOM.toString());
          };
          ViewingDirection.prototype.bottomToTop = function () {
              return new ViewingDirection(ViewingDirection.BOTTOMTOTOP.toString());
          };
          ViewingDirection.LEFTTORIGHT = new ViewingDirection("left-to-right");
          ViewingDirection.RIGHTTOLEFT = new ViewingDirection("right-to-left");
          ViewingDirection.TOPTOBOTTOM = new ViewingDirection("top-to-bottom");
          ViewingDirection.BOTTOMTOTOP = new ViewingDirection("bottom-to-top");
          return ViewingDirection;
      }(Manifesto.StringValue));
      Manifesto.ViewingDirection = ViewingDirection;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var ViewingHint = /** @class */ (function (_super) {
          __extends(ViewingHint, _super);
          function ViewingHint() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          ViewingHint.prototype.continuous = function () {
              return new ViewingHint(ViewingHint.CONTINUOUS.toString());
          };
          ViewingHint.prototype.empty = function () {
              return new ViewingHint(ViewingHint.EMPTY.toString());
          };
          ViewingHint.prototype.individuals = function () {
              return new ViewingHint(ViewingHint.INDIVIDUALS.toString());
          };
          ViewingHint.prototype.nonPaged = function () {
              return new ViewingHint(ViewingHint.NONPAGED.toString());
          };
          ViewingHint.prototype.paged = function () {
              return new ViewingHint(ViewingHint.PAGED.toString());
          };
          ViewingHint.prototype.top = function () {
              return new ViewingHint(ViewingHint.TOP.toString());
          };
          ViewingHint.CONTINUOUS = new ViewingHint("continuous");
          ViewingHint.EMPTY = new ViewingHint("");
          ViewingHint.INDIVIDUALS = new ViewingHint("individuals");
          ViewingHint.NONPAGED = new ViewingHint("non-paged");
          ViewingHint.PAGED = new ViewingHint("paged");
          ViewingHint.TOP = new ViewingHint("top");
          return ViewingHint;
      }(Manifesto.StringValue));
      Manifesto.ViewingHint = ViewingHint;
  })(Manifesto || (Manifesto = {}));
  
  var Manifesto;
  (function (Manifesto) {
      var JSONLDResource = /** @class */ (function () {
          function JSONLDResource(jsonld) {
              this.__jsonld = jsonld;
              this.context = this.getProperty('context');
              this.id = this.getProperty('id');
          }
          JSONLDResource.prototype.getProperty = function (name) {
              var prop = null;
              if (this.__jsonld) {
                  prop = this.__jsonld[name];
                  if (!prop) {
                      // property may have a prepended '@'
                      prop = this.__jsonld['@' + name];
                  }
              }
              return prop;
          };
          return JSONLDResource;
      }());
      Manifesto.JSONLDResource = JSONLDResource;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var ManifestResource = /** @class */ (function (_super) {
          __extends(ManifestResource, _super);
          function ManifestResource(jsonld, options) {
              var _this = _super.call(this, jsonld) || this;
              _this.options = options;
              return _this;
          }
          ManifestResource.prototype.getIIIFResourceType = function () {
              return new Manifesto.IIIFResourceType(Manifesto.Utils.normaliseType(this.getProperty('type')));
          };
          ManifestResource.prototype.getLabel = function () {
              return Manifesto.TranslationCollection.parse(this.getProperty('label'), this.options.locale);
          };
          ManifestResource.prototype.getMetadata = function () {
              var _metadata = this.getProperty('metadata');
              var metadata = [];
              if (!_metadata)
                  return metadata;
              for (var i = 0; i < _metadata.length; i++) {
                  var item = _metadata[i];
                  var metadataItem = new Manifesto.MetadataItem(this.options.locale);
                  metadataItem.parse(item);
                  metadata.push(metadataItem);
              }
              return metadata;
          };
          ManifestResource.prototype.getRendering = function (format) {
              var renderings = this.getRenderings();
              // normalise format to string
              if (typeof (format) !== 'string') {
                  format = format.toString();
              }
              for (var i = 0; i < renderings.length; i++) {
                  var rendering = renderings[i];
                  if (rendering.getFormat().toString() === format) {
                      return rendering;
                  }
              }
              return null;
          };
          ManifestResource.prototype.getRenderings = function () {
              var rendering;
              // if passing a manifesto-parsed object, use the __jsonld.rendering property,
              // otherwise look for a rendering property
              if (this.__jsonld) {
                  rendering = this.__jsonld.rendering;
              }
              else {
                  rendering = this.rendering;
              }
              var renderings = [];
              if (!rendering)
                  return renderings;
              // coerce to array
              if (!Array.isArray(rendering)) {
                  rendering = [rendering];
              }
              for (var i = 0; i < rendering.length; i++) {
                  var r = rendering[i];
                  renderings.push(new Manifesto.Rendering(r, this.options));
              }
              return renderings;
          };
          ManifestResource.prototype.getService = function (profile) {
              return Manifesto.Utils.getService(this, profile);
          };
          ManifestResource.prototype.getServices = function () {
              return Manifesto.Utils.getServices(this);
          };
          ManifestResource.prototype.getThumbnail = function () {
              var thumbnail = this.getProperty('thumbnail');
              if (Array.isArray(thumbnail)) {
                  thumbnail = thumbnail[0];
              }
              if (thumbnail) {
                  return new Manifesto.Thumbnail(thumbnail, this.options);
              }
              return null;
          };
          ManifestResource.prototype.isAnnotation = function () {
              return this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.ANNOTATION.toString();
          };
          ManifestResource.prototype.isCanvas = function () {
              return this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.CANVAS.toString();
          };
          ManifestResource.prototype.isCollection = function () {
              return this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.COLLECTION.toString();
          };
          ManifestResource.prototype.isManifest = function () {
              return this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.MANIFEST.toString();
          };
          ManifestResource.prototype.isRange = function () {
              return this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.RANGE.toString();
          };
          ManifestResource.prototype.isSequence = function () {
              return this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.SEQUENCE.toString();
          };
          return ManifestResource;
      }(Manifesto.JSONLDResource));
      Manifesto.ManifestResource = ManifestResource;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Resource = /** @class */ (function (_super) {
          __extends(Resource, _super);
          function Resource(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          Resource.prototype.getFormat = function () {
              var format = this.getProperty('format');
              if (format) {
                  return new Manifesto.MediaType(format.toLowerCase());
              }
              return null;
          };
          Resource.prototype.getResources = function () {
              var resources = [];
              if (!this.__jsonld.resources)
                  return resources;
              for (var i = 0; i < this.__jsonld.resources.length; i++) {
                  var a = this.__jsonld.resources[i];
                  var annotation = new Manifesto.Annotation(a, this.options);
                  resources.push(annotation);
              }
              return resources;
          };
          Resource.prototype.getType = function () {
              var type = this.getProperty('type');
              if (type) {
                  return new Manifesto.ResourceType(Manifesto.Utils.normaliseType(type));
              }
              return null;
          };
          Resource.prototype.getWidth = function () {
              return this.getProperty('width');
          };
          Resource.prototype.getHeight = function () {
              return this.getProperty('height');
          };
          Resource.prototype.getMaxWidth = function () {
              return this.getProperty('maxWidth');
          };
          Resource.prototype.getMaxHeight = function () {
              var maxHeight = this.getProperty('maxHeight');
              // if a maxHeight hasn't been specified, default to maxWidth.
              // maxWidth in essence becomes maxEdge
              if (!maxHeight) {
                  return this.getMaxWidth();
              }
              return null;
          };
          return Resource;
      }(Manifesto.ManifestResource));
      Manifesto.Resource = Resource;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Canvas = /** @class */ (function (_super) {
          __extends(Canvas, _super);
          function Canvas(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          // http://iiif.io/api/image/2.1/#canonical-uri-syntax
          Canvas.prototype.getCanonicalImageUri = function (w) {
              var id = null;
              var region = 'full';
              var rotation = 0;
              var quality = 'default';
              var width = w;
              var size;
              // if an info.json has been loaded
              if (this.externalResource && this.externalResource.data && this.externalResource.data['@id']) {
                  id = this.externalResource.data['@id'];
                  if (!width) {
                      width = this.externalResource.data.width;
                  }
                  if (this.externalResource.data['@context']) {
                      if (this.externalResource.data['@context'].indexOf('/1.0/context.json') > -1 ||
                          this.externalResource.data['@context'].indexOf('/1.1/context.json') > -1 ||
                          this.externalResource.data['@context'].indexOf('/1/context.json') > -1) {
                          quality = 'native';
                      }
                  }
              }
              else {
                  // info.json hasn't been loaded yet
                  var images = this.getImages();
                  if (images && images.length) {
                      var firstImage = images[0];
                      var resource = firstImage.getResource();
                      var services = resource.getServices();
                      if (!width) {
                          width = resource.getWidth();
                      }
                      if (services.length) {
                          var service = services[0];
                          id = service.id;
                          quality = Manifesto.Utils.getImageQuality(service.getProfile());
                      }
                      else if (width === resource.getWidth()) {
                          // if the passed width is the same as the resource width
                          // i.e. not looking for a thumbnail
                          // return the full size image.
                          // used for download options when loading static images.
                          return resource.id;
                      }
                  }
                  // todo: should this be moved to getThumbUri?
                  if (!id) {
                      var thumbnail = this.getProperty('thumbnail');
                      if (thumbnail) {
                          if (typeof (thumbnail) === 'string') {
                              return thumbnail;
                          }
                          else {
                              if (thumbnail['@id']) {
                                  return thumbnail['@id'];
                              }
                              else if (thumbnail.length) {
                                  return thumbnail[0].id;
                              }
                          }
                      }
                  }
              }
              size = width + ',';
              // trim off trailing '/'
              if (id && id.endsWith('/')) {
                  id = id.substr(0, id.length - 1);
              }
              var uri = [id, region, size, rotation, quality + '.jpg'].join('/');
              return uri;
          };
          Canvas.prototype.getMaxDimensions = function () {
              var maxDimensions = null;
              var profile;
              if (this.externalResource.data && this.externalResource.data.profile) {
                  profile = this.externalResource.data.profile;
                  if (Array.isArray(profile)) {
                      profile = profile.en().where(function (p) { return p["maxWidth" || "maxwidth"]; }).first();
                      if (profile) {
                          maxDimensions = new Manifesto.Size(profile.maxWidth, profile.maxHeight ? profile.maxHeight : profile.maxWidth);
                      }
                  }
              }
              return maxDimensions;
          };
          // Presentation API 3.0
          Canvas.prototype.getContent = function () {
              var content = [];
              var items = this.__jsonld.items || this.__jsonld.content;
              if (!items)
                  return content;
              // should be contained in an AnnotationPage
              var annotationPage = null;
              if (items.length) {
                  annotationPage = new Manifesto.AnnotationPage(items[0], this.options);
              }
              if (!annotationPage) {
                  return content;
              }
              var annotations = annotationPage.getItems();
              for (var i = 0; i < annotations.length; i++) {
                  var a = annotations[i];
                  var annotation = new Manifesto.Annotation(a, this.options);
                  content.push(annotation);
              }
              return content;
          };
          Canvas.prototype.getDuration = function () {
              return this.getProperty('duration');
          };
          Canvas.prototype.getImages = function () {
              var images = [];
              if (!this.__jsonld.images)
                  return images;
              for (var i = 0; i < this.__jsonld.images.length; i++) {
                  var a = this.__jsonld.images[i];
                  var annotation = new Manifesto.Annotation(a, this.options);
                  images.push(annotation);
              }
              return images;
          };
          Canvas.prototype.getIndex = function () {
              return this.getProperty('index');
          };
          Canvas.prototype.getOtherContent = function () {
              var _this = this;
              var otherContent = Array.isArray(this.getProperty('otherContent')) ?
                  this.getProperty('otherContent') :
                  [this.getProperty('otherContent')];
              var canonicalComparison = function (typeA, typeB) {
                  if (typeof typeA !== 'string' || typeof typeB !== 'string') {
                      return false;
                  }
                  return typeA.toLowerCase() === typeA.toLowerCase();
              };
              var otherPromises = otherContent
                  .filter(function (otherContent) { return otherContent && canonicalComparison(otherContent['@type'], 'sc:AnnotationList'); })
                  .map(function (annotationList, i) { return ((new Manifesto.AnnotationList(annotationList['label'] || "Annotation list " + i, annotationList, _this.options))); })
                  .map(function (annotationList) { return annotationList.load(); });
              return Promise.all(otherPromises);
          };
          // Prefer thumbnail service to image service if supplied and if
          // the thumbnail service can provide a satisfactory size +/- x pixels.
          // this is used to get thumb URIs *before* the info.json has been requested
          // and populate thumbnails in a viewer.
          // the publisher may also provide pre-computed fixed-size thumbs for better performance.
          //getThumbUri(width: number): string {
          //
          //    var uri;
          //    var images: IAnnotation[] = this.getImages();
          //
          //    if (images && images.length) {
          //        var firstImage = images[0];
          //        var resource: IResource = firstImage.getResource();
          //        var services: IService[] = resource.getServices();
          //
          //        for (let i = 0; i < services.length; i++) {
          //            var service: IService = services[i];
          //            var id = service.id;
          //
          //            if (!_endsWith(id, '/')) {
          //                id += '/';
          //            }
          //
          //            uri = id + 'full/' + width + ',/0/' + Utils.getImageQuality(service.getProfile()) + '.jpg';
          //        }
          //    }
          //
          //    return uri;
          //}
          //getType(): CanvasType {
          //    return new CanvasType(this.getProperty('@type').toLowerCase());
          //}
          Canvas.prototype.getWidth = function () {
              return this.getProperty('width');
          };
          Canvas.prototype.getHeight = function () {
              return this.getProperty('height');
          };
          return Canvas;
      }(Manifesto.Resource));
      Manifesto.Canvas = Canvas;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var IIIFResource = /** @class */ (function (_super) {
          __extends(IIIFResource, _super);
          function IIIFResource(jsonld, options) {
              var _this = _super.call(this, jsonld, options) || this;
              _this.index = -1;
              _this.isLoaded = false;
              var defaultOptions = {
                  defaultLabel: '-',
                  locale: 'en-GB',
                  resource: _this,
                  pessimisticAccessControl: false
              };
              _this.options = Object.assign(defaultOptions, options);
              return _this;
          }
          IIIFResource.prototype.getAttribution = function () {
              var attribution = this.getProperty('attribution');
              if (attribution) {
                  return Manifesto.TranslationCollection.parse(attribution, this.options.locale);
              }
              return [];
          };
          IIIFResource.prototype.getDescription = function () {
              var description = this.getProperty('description');
              if (description) {
                  return Manifesto.TranslationCollection.parse(description, this.options.locale);
              }
              return [];
          };
          IIIFResource.prototype.getIIIFResourceType = function () {
              return new Manifesto.IIIFResourceType(Manifesto.Utils.normaliseType(this.getProperty('type')));
          };
          IIIFResource.prototype.getLogo = function () {
              var logo = this.getProperty('logo');
              if (!logo)
                  return null;
              if (typeof (logo) === 'string')
                  return logo;
              return logo['@id'];
          };
          IIIFResource.prototype.getLicense = function () {
              return Manifesto.Utils.getLocalisedValue(this.getProperty('license'), this.options.locale);
          };
          IIIFResource.prototype.getNavDate = function () {
              return new Date(this.getProperty('navDate'));
          };
          IIIFResource.prototype.getRelated = function () {
              return this.getProperty('related');
          };
          IIIFResource.prototype.getSeeAlso = function () {
              return this.getProperty('seeAlso');
          };
          IIIFResource.prototype.getLabel = function () {
              var label = this.getProperty('label');
              if (label) {
                  return Manifesto.TranslationCollection.parse(label, this.options.locale);
              }
              return [];
          };
          IIIFResource.prototype.getDefaultLabel = function () {
              return Manifesto.TranslationCollection.getValue(this.getLabel());
          };
          IIIFResource.prototype.getDefaultTree = function () {
              this.defaultTree = new Manifesto.TreeNode('root');
              this.defaultTree.data = this;
              return this.defaultTree;
          };
          IIIFResource.prototype.isCollection = function () {
              if (this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.COLLECTION.toString()) {
                  return true;
              }
              return false;
          };
          IIIFResource.prototype.isManifest = function () {
              if (this.getIIIFResourceType().toString() === Manifesto.IIIFResourceType.MANIFEST.toString()) {
                  return true;
              }
              return false;
          };
          IIIFResource.prototype.load = function () {
              var that = this;
              return new Promise(function (resolve, reject) {
                  if (that.isLoaded) {
                      resolve(that);
                  }
                  else {
                      var options_1 = that.options;
                      options_1.navDate = that.getNavDate();
                      var id = that.__jsonld.id;
                      if (!id) {
                          id = that.__jsonld['@id'];
                      }
                      Manifesto.Utils.loadResource(id).then(function (data) {
                          that.parentLabel = Manifesto.TranslationCollection.getValue(that.getLabel(), options_1.locale);
                          var parsed = Manifesto.Deserialiser.parse(data, options_1);
                          that = Object.assign(that, parsed);
                          that.index = options_1.index;
                          resolve(that);
                      });
                  }
              });
          };
          return IIIFResource;
      }(Manifesto.ManifestResource));
      Manifesto.IIIFResource = IIIFResource;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Manifest = /** @class */ (function (_super) {
          __extends(Manifest, _super);
          function Manifest(jsonld, options) {
              var _this = _super.call(this, jsonld, options) || this;
              _this.index = 0;
              _this._allRanges = null;
              _this.items = [];
              _this._topRanges = [];
              if (_this.__jsonld.structures && _this.__jsonld.structures.length) {
                  var topRanges = _this._getTopRanges();
                  for (var i = 0; i < topRanges.length; i++) {
                      var range = topRanges[i];
                      _this._parseRanges(range, String(i));
                  }
              }
              return _this;
          }
          Manifest.prototype.getBehavior = function () {
              if (this.getProperty('behavior')) {
                  return new Manifesto.Behavior(this.getProperty('behavior'));
              }
              return null;
          };
          Manifest.prototype.getDefaultTree = function () {
              _super.prototype.getDefaultTree.call(this);
              this.defaultTree.data.type = Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.MANIFEST.toString());
              if (!this.isLoaded) {
                  return this.defaultTree;
              }
              var topRanges = this.getTopRanges();
              // if there are any ranges in the manifest, default to the first 'top' range or generated placeholder
              if (topRanges.length) {
                  topRanges[0].getTree(this.defaultTree);
              }
              Manifesto.Utils.generateTreeNodeIds(this.defaultTree);
              return this.defaultTree;
          };
          Manifest.prototype._getTopRanges = function () {
              var topRanges = [];
              if (this.__jsonld.structures && this.__jsonld.structures.length) {
                  for (var i = 0; i < this.__jsonld.structures.length; i++) {
                      var json = this.__jsonld.structures[i];
                      if (json.viewingHint === Manifesto.ViewingHint.TOP.toString()) {
                          topRanges.push(json);
                      }
                  }
                  // if no viewingHint="top" range was found, create a default one
                  if (!topRanges.length) {
                      var range = {};
                      range.ranges = this.__jsonld.structures;
                      topRanges.push(range);
                  }
              }
              return topRanges;
          };
          Manifest.prototype.getTopRanges = function () {
              return this._topRanges;
          };
          Manifest.prototype._getRangeById = function (id) {
              if (this.__jsonld.structures && this.__jsonld.structures.length) {
                  for (var i = 0; i < this.__jsonld.structures.length; i++) {
                      var r = this.__jsonld.structures[i];
                      if (r['@id'] === id || r.id === id) {
                          return r;
                      }
                  }
              }
              return null;
          };
          //private _parseRangeCanvas(json: any, range: IRange): void {
          // todo: currently this isn't needed
          //var canvas: IJSONLDResource = new JSONLDResource(json);
          //range.items.push(<IManifestResource>canvas);
          //}
          Manifest.prototype._parseRanges = function (r, path, parentRange) {
              var range;
              var id = null;
              if (typeof (r) === 'string') {
                  id = r;
                  r = this._getRangeById(id);
              }
              if (!r) {
                  console.warn("Range:", id, "does not exist");
                  return;
              }
              range = new Manifesto.Range(r, this.options);
              range.parentRange = parentRange;
              range.path = path;
              if (!parentRange) {
                  this._topRanges.push(range);
              }
              else {
                  parentRange.items.push(range);
              }
              var items = r.items || r.members;
              if (items) {
                  for (var i = 0; i < items.length; i++) {
                      var item = items[i];
                      // todo: use an ItemType constant?
                      if (item['@type'] && item['@type'].toLowerCase() === 'sc:range' || item['type'] && item['type'].toLowerCase() === 'range') {
                          this._parseRanges(item, path + '/' + i, range);
                      }
                      else if (item['@type'] && item['@type'].toLowerCase() === 'sc:canvas' || item['type'] && item['type'].toLowerCase() === 'canvas') {
                          // store the ids on the __jsonld object to be used by Range.getCanvasIds()
                          if (!range.canvases) {
                              range.canvases = [];
                          }
                          var id_1 = item.id || item['@id'];
                          range.canvases.push(id_1);
                      }
                  }
              }
              else if (r.ranges) {
                  for (var i = 0; i < r.ranges.length; i++) {
                      this._parseRanges(r.ranges[i], path + '/' + i, range);
                  }
              }
          };
          Manifest.prototype.getAllRanges = function () {
              if (this._allRanges != null)
                  return this._allRanges;
              this._allRanges = [];
              var topRanges = this.getTopRanges();
              for (var i = 0; i < topRanges.length; i++) {
                  var topRange = topRanges[i];
                  if (topRange.id) {
                      this._allRanges.push(topRange); // it might be a placeholder root range
                  }
                  var subRanges = topRange.getRanges();
                  this._allRanges = this._allRanges.concat(subRanges.en().traverseUnique(function (range) { return range.getRanges(); }).toArray());
              }
              return this._allRanges;
          };
          Manifest.prototype.getRangeById = function (id) {
              var ranges = this.getAllRanges();
              for (var i = 0; i < ranges.length; i++) {
                  var range = ranges[i];
                  if (range.id === id) {
                      return range;
                  }
              }
              return null;
          };
          Manifest.prototype.getRangeByPath = function (path) {
              var ranges = this.getAllRanges();
              for (var i = 0; i < ranges.length; i++) {
                  var range = ranges[i];
                  if (range.path === path) {
                      return range;
                  }
              }
              return null;
          };
          Manifest.prototype.getSequences = function () {
              if (this.items.length) {
                  return this.items;
              }
              // IxIF mediaSequences overrode sequences, so need to be checked first.
              // deprecate this when presentation 3 ships
              var items = this.__jsonld.mediaSequences || this.__jsonld.sequences;
              if (items) {
                  for (var i = 0; i < items.length; i++) {
                      var s = items[i];
                      var sequence = new Manifesto.Sequence(s, this.options);
                      this.items.push(sequence);
                  }
              }
              else if (this.__jsonld.items) {
                  var sequence = new Manifesto.Sequence(this.__jsonld.items, this.options);
                  this.items.push(sequence);
              }
              return this.items;
          };
          Manifest.prototype.getSequenceByIndex = function (sequenceIndex) {
              return this.getSequences()[sequenceIndex];
          };
          Manifest.prototype.getTotalSequences = function () {
              return this.getSequences().length;
          };
          Manifest.prototype.getManifestType = function () {
              var service = this.getService(Manifesto.ServiceProfile.UIEXTENSIONS);
              if (service) {
                  return new Manifesto.ManifestType(service.getProperty('manifestType'));
              }
              return new Manifesto.ManifestType('');
          };
          Manifest.prototype.getTrackingLabel = function () {
              var service = this.getService(Manifesto.ServiceProfile.TRACKINGEXTENSIONS);
              if (service) {
                  return service.getProperty('trackingLabel');
              }
              return '';
          };
          Manifest.prototype.isMultiSequence = function () {
              return this.getTotalSequences() > 1;
          };
          Manifest.prototype.isPagingEnabled = function () {
              return this.getViewingHint().toString() === Manifesto.ViewingHint.PAGED.toString();
          };
          Manifest.prototype.getViewingDirection = function () {
              if (this.getProperty('viewingDirection')) {
                  return new Manifesto.ViewingDirection(this.getProperty('viewingDirection'));
              }
              return Manifesto.ViewingDirection.LEFTTORIGHT;
          };
          Manifest.prototype.getViewingHint = function () {
              if (this.getProperty('viewingHint')) {
                  return new Manifesto.ViewingHint(this.getProperty('viewingHint'));
              }
              return Manifesto.ViewingHint.EMPTY;
          };
          return Manifest;
      }(Manifesto.IIIFResource));
      Manifesto.Manifest = Manifest;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Collection = /** @class */ (function (_super) {
          __extends(Collection, _super);
          function Collection(jsonld, options) {
              var _this = _super.call(this, jsonld, options) || this;
              _this.items = [];
              _this._collections = null;
              _this._manifests = null;
              jsonld.__collection = _this;
              return _this;
          }
          Collection.prototype.getCollections = function () {
              if (this._collections) {
                  return this._collections;
              }
              return this._collections = this.items.en().where(function (m) { return m.isCollection(); }).toArray();
          };
          Collection.prototype.getManifests = function () {
              if (this._manifests) {
                  return this._manifests;
              }
              return this._manifests = this.items.en().where(function (m) { return m.isManifest(); }).toArray();
          };
          Collection.prototype.getCollectionByIndex = function (collectionIndex) {
              var collections = this.getCollections();
              if (!collections[collectionIndex]) {
                  throw new Error("Collection index is outside range of array");
              }
              var collection = collections[collectionIndex];
              collection.options.index = collectionIndex;
              // id for collection MUST be dereferenceable
              return collection.load();
          };
          Collection.prototype.getManifestByIndex = function (manifestIndex) {
              var manifests = this.getManifests();
              if (!manifests[manifestIndex]) {
                  throw new Error("Manifest index is outside range of array");
              }
              var manifest = manifests[manifestIndex];
              manifest.options.index = manifestIndex;
              return manifest.load();
          };
          Collection.prototype.getTotalCollections = function () {
              return this.getCollections().length;
          };
          Collection.prototype.getTotalManifests = function () {
              return this.getManifests().length;
          };
          Collection.prototype.getTotalItems = function () {
              return this.items.length;
          };
          Collection.prototype.getViewingDirection = function () {
              if (this.getProperty('viewingDirection')) {
                  return new Manifesto.ViewingDirection(this.getProperty('viewingDirection'));
              }
              return Manifesto.ViewingDirection.LEFTTORIGHT;
          };
          /**
           * Get a tree of sub collections and manifests, using each child manifest's first 'top' range.
           */
          Collection.prototype.getDefaultTree = function () {
              _super.prototype.getDefaultTree.call(this);
              this.defaultTree.data.type = Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.COLLECTION.toString());
              this._parseManifests(this);
              this._parseCollections(this);
              Manifesto.Utils.generateTreeNodeIds(this.defaultTree);
              return this.defaultTree;
          };
          Collection.prototype._parseManifests = function (parentCollection) {
              if (parentCollection.getManifests() && parentCollection.getManifests().length) {
                  for (var i = 0; i < parentCollection.getManifests().length; i++) {
                      var manifest = parentCollection.getManifests()[i];
                      var tree = manifest.getDefaultTree();
                      tree.label = manifest.parentLabel || Manifesto.TranslationCollection.getValue(manifest.getLabel(), this.options.locale) || 'manifest ' + (i + 1);
                      tree.navDate = manifest.getNavDate();
                      tree.data.id = manifest.id;
                      tree.data.type = Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.MANIFEST.toString());
                      parentCollection.defaultTree.addNode(tree);
                  }
              }
          };
          Collection.prototype._parseCollections = function (parentCollection) {
              if (parentCollection.getCollections() && parentCollection.getCollections().length) {
                  for (var i = 0; i < parentCollection.getCollections().length; i++) {
                      var collection = parentCollection.getCollections()[i];
                      var tree = collection.getDefaultTree();
                      tree.label = collection.parentLabel || Manifesto.TranslationCollection.getValue(collection.getLabel(), this.options.locale) || 'collection ' + (i + 1);
                      tree.navDate = collection.getNavDate();
                      tree.data.id = collection.id;
                      tree.data.type = Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.COLLECTION.toString());
                      parentCollection.defaultTree.addNode(tree);
                      this._parseCollections(collection);
                  }
              }
          };
          return Collection;
      }(Manifesto.IIIFResource));
      Manifesto.Collection = Collection;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Range = /** @class */ (function (_super) {
          __extends(Range, _super);
          function Range(jsonld, options) {
              var _this = _super.call(this, jsonld, options) || this;
              _this._ranges = null;
              _this.canvases = null;
              _this.items = [];
              return _this;
          }
          Range.prototype.getCanvasIds = function () {
              if (this.__jsonld.canvases) {
                  return this.__jsonld.canvases;
              }
              else if (this.canvases) {
                  return this.canvases;
              }
              return [];
          };
          // getCanvases(): ICanvas[] {
          //     if (this._canvases) {
          //         return this._canvases;
          //     }
          //     return this._canvases = <ICanvas[]>this.items.en().where(m => m.isCanvas()).toArray();
          // }
          Range.prototype.getRanges = function () {
              if (this._ranges) {
                  return this._ranges;
              }
              return this._ranges = this.items.en().where(function (m) { return m.isRange(); }).toArray();
          };
          Range.prototype.getBehavior = function () {
              if (this.getProperty('behavior')) {
                  return new Manifesto.Behavior(this.getProperty('behavior'));
              }
              return null;
          };
          Range.prototype.getViewingDirection = function () {
              if (this.getProperty('viewingDirection')) {
                  return new Manifesto.ViewingDirection(this.getProperty('viewingDirection'));
              }
              return null;
          };
          Range.prototype.getViewingHint = function () {
              if (this.getProperty('viewingHint')) {
                  return new Manifesto.ViewingHint(this.getProperty('viewingHint'));
              }
              return null;
          };
          Range.prototype.getTree = function (treeRoot) {
              treeRoot.data = this;
              this.treeNode = treeRoot;
              var ranges = this.getRanges();
              if (ranges && ranges.length) {
                  for (var i = 0; i < ranges.length; i++) {
                      var range = ranges[i];
                      var node = new Manifesto.TreeNode();
                      treeRoot.addNode(node);
                      this._parseTreeNode(node, range);
                  }
              }
              Manifesto.Utils.generateTreeNodeIds(treeRoot);
              return treeRoot;
          };
          Range.prototype._parseTreeNode = function (node, range) {
              node.label = Manifesto.TranslationCollection.getValue(range.getLabel(), this.options.locale);
              node.data = range;
              node.data.type = Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.RANGE.toString());
              range.treeNode = node;
              var ranges = range.getRanges();
              if (ranges && ranges.length) {
                  for (var i = 0; i < ranges.length; i++) {
                      var childRange = ranges[i];
                      var behavior = childRange.getBehavior();
                      if (behavior && behavior.toString() === Manifesto.Behavior.NONAV.toString()) {
                          continue;
                      }
                      else {
                          var childNode = new Manifesto.TreeNode();
                          node.addNode(childNode);
                          this._parseTreeNode(childNode, childRange);
                      }
                  }
              }
          };
          return Range;
      }(Manifesto.ManifestResource));
      Manifesto.Range = Range;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Rendering = /** @class */ (function (_super) {
          __extends(Rendering, _super);
          function Rendering(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          Rendering.prototype.getFormat = function () {
              return new Manifesto.RenderingFormat(this.getProperty('format'));
          };
          return Rendering;
      }(Manifesto.ManifestResource));
      Manifesto.Rendering = Rendering;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Sequence = /** @class */ (function (_super) {
          __extends(Sequence, _super);
          function Sequence(jsonld, options) {
              var _this = _super.call(this, jsonld, options) || this;
              _this.items = [];
              _this._thumbnails = null;
              return _this;
          }
          Sequence.prototype.getCanvases = function () {
              if (this.items.length) {
                  return this.items;
              }
              var items = this.__jsonld.canvases || this.__jsonld.elements;
              if (items) {
                  for (var i = 0; i < items.length; i++) {
                      var c = items[i];
                      var canvas = new Manifesto.Canvas(c, this.options);
                      canvas.index = i;
                      this.items.push(canvas);
                  }
              }
              else if (this.__jsonld) {
                  for (var i = 0; i < this.__jsonld.length; i++) {
                      var c = this.__jsonld[i];
                      var canvas = new Manifesto.Canvas(c, this.options);
                      canvas.index = i;
                      this.items.push(canvas);
                  }
              }
              return this.items;
          };
          Sequence.prototype.getCanvasById = function (id) {
              for (var i = 0; i < this.getTotalCanvases(); i++) {
                  var canvas = this.getCanvasByIndex(i);
                  // normalise canvas id
                  var canvasId = Manifesto.Utils.normaliseUrl(canvas.id);
                  if (Manifesto.Utils.normaliseUrl(id) === canvasId) {
                      return canvas;
                  }
              }
              return null;
          };
          Sequence.prototype.getCanvasByIndex = function (canvasIndex) {
              return this.getCanvases()[canvasIndex];
          };
          Sequence.prototype.getCanvasIndexById = function (id) {
              for (var i = 0; i < this.getTotalCanvases(); i++) {
                  var canvas = this.getCanvasByIndex(i);
                  if (canvas.id === id) {
                      return i;
                  }
              }
              return null;
          };
          Sequence.prototype.getCanvasIndexByLabel = function (label, foliated) {
              label = label.trim();
              if (!isNaN(label)) {
                  label = parseInt(label, 10).toString(); // trim any preceding zeros.
                  if (foliated)
                      label += 'r'; // default to recto
              }
              var doublePageRegExp = /(\d*)\D+(\d*)/;
              var match, regExp, regStr, labelPart1, labelPart2;
              for (var i = 0; i < this.getTotalCanvases(); i++) {
                  var canvas = this.getCanvasByIndex(i);
                  // check if there's a literal match
                  if (Manifesto.TranslationCollection.getValue(canvas.getLabel(), this.options.locale) === label) {
                      return i;
                  }
                  // check if there's a match for double-page spreads e.g. 100-101, 100_101, 100 101
                  match = doublePageRegExp.exec(label);
                  if (!match)
                      continue;
                  labelPart1 = match[1];
                  labelPart2 = match[2];
                  if (!labelPart2)
                      continue;
                  regStr = "^" + labelPart1 + "\\D+" + labelPart2 + "$";
                  regExp = new RegExp(regStr);
                  if (regExp.test(canvas.getLabel().toString())) {
                      return i;
                  }
              }
              return -1;
          };
          Sequence.prototype.getLastCanvasLabel = function (alphanumeric) {
              for (var i = this.getTotalCanvases() - 1; i >= 0; i--) {
                  var canvas = this.getCanvasByIndex(i);
                  var label = Manifesto.TranslationCollection.getValue(canvas.getLabel(), this.options.locale);
                  if (alphanumeric) {
                      var regExp = /^[a-zA-Z0-9]*$/;
                      if (regExp.test(label)) {
                          return label;
                      }
                  }
                  else if (label) {
                      return label;
                  }
              }
              return this.options.defaultLabel;
          };
          Sequence.prototype.getLastPageIndex = function () {
              return this.getTotalCanvases() - 1;
          };
          Sequence.prototype.getNextPageIndex = function (canvasIndex, pagingEnabled) {
              var index;
              if (pagingEnabled) {
                  var indices = this.getPagedIndices(canvasIndex);
                  if (this.getViewingDirection().toString() === Manifesto.ViewingDirection.RIGHTTOLEFT.toString()) {
                      index = indices[0] + 1;
                  }
                  else {
                      index = indices[indices.length - 1] + 1;
                  }
              }
              else {
                  index = canvasIndex + 1;
              }
              if (index > this.getLastPageIndex()) {
                  return -1;
              }
              return index;
          };
          Sequence.prototype.getPagedIndices = function (canvasIndex, pagingEnabled) {
              var indices = [];
              if (!pagingEnabled) {
                  indices.push(canvasIndex);
              }
              else {
                  if (this.isFirstCanvas(canvasIndex) || this.isLastCanvas(canvasIndex)) {
                      indices = [canvasIndex];
                  }
                  else if (canvasIndex % 2) {
                      indices = [canvasIndex, canvasIndex + 1];
                  }
                  else {
                      indices = [canvasIndex - 1, canvasIndex];
                  }
                  if (this.getViewingDirection().toString() === Manifesto.ViewingDirection.RIGHTTOLEFT.toString()) {
                      indices = indices.reverse();
                  }
              }
              return indices;
          };
          Sequence.prototype.getPrevPageIndex = function (canvasIndex, pagingEnabled) {
              var index;
              if (pagingEnabled) {
                  var indices = this.getPagedIndices(canvasIndex);
                  if (this.getViewingDirection().toString() === Manifesto.ViewingDirection.RIGHTTOLEFT.toString()) {
                      index = indices[indices.length - 1] - 1;
                  }
                  else {
                      index = indices[0] - 1;
                  }
              }
              else {
                  index = canvasIndex - 1;
              }
              return index;
          };
          Sequence.prototype.getStartCanvasIndex = function () {
              var startCanvas = this.getStartCanvas();
              if (startCanvas) {
                  // if there's a startCanvas attribute, loop through the canvases and return the matching index.
                  for (var i = 0; i < this.getTotalCanvases(); i++) {
                      var canvas = this.getCanvasByIndex(i);
                      if (canvas.id === startCanvas)
                          return i;
                  }
              }
              // default to first canvas.
              return 0;
          };
          // todo: deprecate
          Sequence.prototype.getThumbs = function (width, height) {
              console.warn('getThumbs will be deprecated, use getThumbnails instead');
              var thumbs = [];
              var totalCanvases = this.getTotalCanvases();
              for (var i = 0; i < totalCanvases; i++) {
                  var canvas = this.getCanvasByIndex(i);
                  var thumb = new Manifesto.Thumb(width, canvas);
                  thumbs.push(thumb);
              }
              return thumbs;
          };
          Sequence.prototype.getThumbnails = function () {
              if (this._thumbnails != null)
                  return this._thumbnails;
              this._thumbnails = [];
              var canvases = this.getCanvases();
              for (var i = 0; i < canvases.length; i++) {
                  var thumbnail = canvases[i].getThumbnail();
                  if (thumbnail) {
                      this._thumbnails.push(thumbnail);
                  }
              }
              return this._thumbnails;
          };
          Sequence.prototype.getStartCanvas = function () {
              return this.getProperty('startCanvas');
          };
          Sequence.prototype.getTotalCanvases = function () {
              return this.getCanvases().length;
          };
          Sequence.prototype.getViewingDirection = function () {
              if (this.getProperty('viewingDirection')) {
                  return new Manifesto.ViewingDirection(this.getProperty('viewingDirection'));
              }
              else if (this.options.resource.getViewingDirection) {
                  return this.options.resource.getViewingDirection();
              }
              return Manifesto.ViewingDirection.LEFTTORIGHT;
          };
          Sequence.prototype.getViewingHint = function () {
              if (this.getProperty('viewingHint')) {
                  return new Manifesto.ViewingHint(this.getProperty('viewingHint'));
              }
              return Manifesto.ViewingHint.EMPTY;
          };
          Sequence.prototype.isCanvasIndexOutOfRange = function (canvasIndex) {
              return canvasIndex > this.getTotalCanvases() - 1;
          };
          Sequence.prototype.isFirstCanvas = function (canvasIndex) {
              return canvasIndex === 0;
          };
          Sequence.prototype.isLastCanvas = function (canvasIndex) {
              return canvasIndex === this.getTotalCanvases() - 1;
          };
          Sequence.prototype.isMultiCanvas = function () {
              return this.getTotalCanvases() > 1;
          };
          Sequence.prototype.isPagingEnabled = function () {
              return this.getViewingHint().toString() === Manifesto.ViewingHint.PAGED.toString();
          };
          // checks if the number of canvases is even - therefore has a front and back cover
          Sequence.prototype.isTotalCanvasesEven = function () {
              return this.getTotalCanvases() % 2 === 0;
          };
          return Sequence;
      }(Manifesto.ManifestResource));
      Manifesto.Sequence = Sequence;
  })(Manifesto || (Manifesto = {}));
  
  var Manifesto;
  (function (Manifesto) {
      var Deserialiser = /** @class */ (function () {
          function Deserialiser() {
          }
          Deserialiser.parse = function (manifest, options) {
              if (typeof manifest === 'string') {
                  manifest = JSON.parse(manifest);
              }
              return this.parseJson(manifest, options);
          };
          Deserialiser.parseJson = function (json, options) {
              var resource;
              // have options been passed for the manifest to inherit?
              if (options) {
                  if (options.navDate && !isNaN(options.navDate.getTime())) {
                      json.navDate = options.navDate.toString();
                  }
              }
              if (json['@type']) {
                  switch (json['@type']) {
                      case 'sc:Collection':
                          resource = this.parseCollection(json, options);
                          break;
                      case 'sc:Manifest':
                          resource = this.parseManifest(json, options);
                          break;
                      default:
                          return null;
                  }
              }
              else {
                  // presentation 3
                  switch (json['type']) {
                      case 'Collection':
                          resource = this.parseCollection(json, options);
                          break;
                      case 'Manifest':
                          resource = this.parseManifest(json, options);
                          break;
                      default:
                          return null;
                  }
              }
              // Top-level resource was loaded from a URI, so flag it to prevent
              // unnecessary reload:
              resource.isLoaded = true;
              return resource;
          };
          Deserialiser.parseCollection = function (json, options) {
              var collection = new Manifesto.Collection(json, options);
              if (options) {
                  collection.index = options.index || 0;
              }
              else {
                  collection.index = 0;
              }
              this.parseCollections(collection, options);
              this.parseManifests(collection, options);
              this.parseItems(collection, options);
              return collection;
          };
          Deserialiser.parseCollections = function (collection, options) {
              var items;
              if (collection.__jsonld.collections) {
                  items = collection.__jsonld.collections;
              }
              else if (collection.__jsonld.items) {
                  items = collection.__jsonld.items.en().where(function (m) { return m.type.toLowerCase() === 'collection'; }).toArray();
              }
              if (items) {
                  for (var i = 0; i < items.length; i++) {
                      if (options) {
                          options.index = i;
                      }
                      var item = this.parseCollection(items[i], options);
                      item.index = i;
                      item.parentCollection = collection;
                      collection.items.push(item);
                  }
              }
          };
          Deserialiser.parseManifest = function (json, options) {
              var manifest = new Manifesto.Manifest(json, options);
              return manifest;
          };
          Deserialiser.parseManifests = function (collection, options) {
              var items;
              if (collection.__jsonld.manifests) {
                  items = collection.__jsonld.manifests;
              }
              else if (collection.__jsonld.items) {
                  items = collection.__jsonld.items.en().where(function (m) { return m.type.toLowerCase() === 'manifest'; }).toArray();
              }
              if (items) {
                  for (var i = 0; i < items.length; i++) {
                      var item = this.parseManifest(items[i], options);
                      item.index = i;
                      item.parentCollection = collection;
                      collection.items.push(item);
                  }
              }
          };
          Deserialiser.parseItem = function (json, options) {
              if (json['@type']) {
                  if (json['@type'].toLowerCase() === 'sc:manifest') {
                      return this.parseManifest(json, options);
                  }
                  else if (json['@type'].toLowerCase() === 'sc:collection') {
                      return this.parseCollection(json, options);
                  }
              }
              else if (json.type) {
                  if (json.type.toLowerCase() === 'manifest') {
                      return this.parseManifest(json, options);
                  }
                  else if (json.type.toLowerCase() === 'collection') {
                      return this.parseCollection(json, options);
                  }
              }
              return null;
          };
          Deserialiser.parseItems = function (collection, options) {
              var items = collection.__jsonld.members || collection.__jsonld.items;
              if (items) {
                  var _loop_1 = function (i) {
                      if (options) {
                          options.index = i;
                      }
                      var item = this_1.parseItem(items[i], options);
                      if (!item)
                          return { value: void 0 };
                      // only add to items if not already parsed from backwards-compatible collections/manifests arrays
                      if (collection.items.en().where(function (m) { return m.id === item.id; }).first()) {
                          return "continue";
                      }
                      item.index = i;
                      item.parentCollection = collection;
                      collection.items.push(item);
                  };
                  var this_1 = this;
                  for (var i = 0; i < items.length; i++) {
                      var state_1 = _loop_1(i);
                      if (typeof state_1 === "object")
                          return state_1.value;
                  }
              }
          };
          return Deserialiser;
      }());
      Manifesto.Deserialiser = Deserialiser;
      var Serialiser = /** @class */ (function () {
          function Serialiser() {
          }
          Serialiser.serialise = function (manifest) {
              // todo
              return "";
          };
          return Serialiser;
      }());
      Manifesto.Serialiser = Serialiser;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Service = /** @class */ (function (_super) {
          __extends(Service, _super);
          function Service(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          Service.prototype.getProfile = function () {
              var profile = this.getProperty('profile');
              if (!profile) {
                  profile = this.getProperty('dcterms:conformsTo');
              }
              if (Array.isArray(profile)) {
                  return new Manifesto.ServiceProfile(profile[0]);
              }
              return new Manifesto.ServiceProfile(profile);
          };
          Service.prototype.getConfirmLabel = function () {
              return Manifesto.Utils.getLocalisedValue(this.getProperty('confirmLabel'), this.options.locale);
          };
          Service.prototype.getDescription = function () {
              return Manifesto.Utils.getLocalisedValue(this.getProperty('description'), this.options.locale);
          };
          Service.prototype.getFailureDescription = function () {
              return Manifesto.Utils.getLocalisedValue(this.getProperty('failureDescription'), this.options.locale);
          };
          Service.prototype.getFailureHeader = function () {
              return Manifesto.Utils.getLocalisedValue(this.getProperty('failureHeader'), this.options.locale);
          };
          Service.prototype.getHeader = function () {
              return Manifesto.Utils.getLocalisedValue(this.getProperty('header'), this.options.locale);
          };
          Service.prototype.getServiceLabel = function () {
              return Manifesto.Utils.getLocalisedValue(this.getProperty('label'), this.options.locale);
          };
          Service.prototype.getInfoUri = function () {
              var infoUri = this.id;
              if (!infoUri.endsWith('/')) {
                  infoUri += '/';
              }
              infoUri += 'info.json';
              return infoUri;
          };
          return Service;
      }(Manifesto.ManifestResource));
      Manifesto.Service = Service;
  })(Manifesto || (Manifesto = {}));
  
  
  var Manifesto;
  (function (Manifesto) {
      // todo: deprecate
      // this is used by Sequence.getThumbs
      var Thumb = /** @class */ (function () {
          function Thumb(width, canvas) {
              this.data = canvas;
              this.index = canvas.index;
              this.width = width;
              var heightRatio = canvas.getHeight() / canvas.getWidth();
              if (heightRatio) {
                  this.height = Math.floor(this.width * heightRatio);
              }
              else {
                  this.height = width;
              }
              this.uri = canvas.getCanonicalImageUri(width);
              this.label = Manifesto.TranslationCollection.getValue(canvas.getLabel()); // todo: pass locale?
          }
          return Thumb;
      }());
      Manifesto.Thumb = Thumb;
  })(Manifesto || (Manifesto = {}));
  
  
  var Manifesto;
  (function (Manifesto) {
      var TreeNode = /** @class */ (function () {
          function TreeNode(label, data) {
              this.label = label;
              this.data = data || {};
              this.nodes = [];
          }
          TreeNode.prototype.addNode = function (node) {
              this.nodes.push(node);
              node.parentNode = this;
          };
          TreeNode.prototype.isCollection = function () {
              return this.data.type === Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.COLLECTION.toString());
          };
          TreeNode.prototype.isManifest = function () {
              return this.data.type === Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.MANIFEST.toString());
          };
          TreeNode.prototype.isRange = function () {
              return this.data.type === Manifesto.Utils.normaliseType(Manifesto.TreeNodeType.RANGE.toString());
          };
          return TreeNode;
      }());
      Manifesto.TreeNode = TreeNode;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var TreeNodeType = /** @class */ (function (_super) {
          __extends(TreeNodeType, _super);
          function TreeNodeType() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          // todo: use getters when ES3 target is no longer required.
          TreeNodeType.prototype.collection = function () {
              return new TreeNodeType(TreeNodeType.COLLECTION.toString());
          };
          TreeNodeType.prototype.manifest = function () {
              return new TreeNodeType(TreeNodeType.MANIFEST.toString());
          };
          TreeNodeType.prototype.range = function () {
              return new TreeNodeType(TreeNodeType.RANGE.toString());
          };
          TreeNodeType.COLLECTION = new TreeNodeType("collection");
          TreeNodeType.MANIFEST = new TreeNodeType("manifest");
          TreeNodeType.RANGE = new TreeNodeType("range");
          return TreeNodeType;
      }(Manifesto.StringValue));
      Manifesto.TreeNodeType = TreeNodeType;
  })(Manifesto || (Manifesto = {}));
  
  var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
      return new (P || (P = Promise))(function (resolve, reject) {
          function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
          function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
          function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
          step((generator = generator.apply(thisArg, _arguments || [])).next());
      });
  };
  var __generator = (this && this.__generator) || function (thisArg, body) {
      var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
      return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
      function verb(n) { return function (v) { return step([n, v]); }; }
      function step(op) {
          if (f) throw new TypeError("Generator is already executing.");
          while (_) try {
              if (f = 1, y && (t = y[op[0] & 2 ? "return" : op[0] ? "throw" : "next"]) && !(t = t.call(y, op[1])).done) return t;
              if (y = 0, t) op = [0, t.value];
              switch (op[0]) {
                  case 0: case 1: t = op; break;
                  case 4: _.label++; return { value: op[1], done: false };
                  case 5: _.label++; y = op[1]; op = [0]; continue;
                  case 7: op = _.ops.pop(); _.trys.pop(); continue;
                  default:
                      if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                      if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                      if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                      if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                      if (t[2]) _.ops.pop();
                      _.trys.pop(); continue;
              }
              op = body.call(thisArg, _);
          } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
          if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
      }
  };
  var http = require('http');
  var https = require('https');
  var url = require('url');
  var Manifesto;
  (function (Manifesto) {
      var Utils = /** @class */ (function () {
          function Utils() {
          }
          Utils.getMediaType = function (type) {
              type = type.toLowerCase();
              type = type.split(';')[0];
              return type.trim();
          };
          Utils.getImageQuality = function (profile) {
              var p = profile.toString();
              if (p === Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE1.toString() ||
                  p === Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE2.toString() ||
                  p === Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE1.toString() ||
                  p === Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE2.toString() ||
                  p === Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE1.toString() ||
                  p === Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE2.toString() ||
                  p === Manifesto.ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE1.toString() ||
                  p === Manifesto.ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE2.toString() ||
                  p === Manifesto.ServiceProfile.IIIF1IMAGELEVEL1.toString() ||
                  p === Manifesto.ServiceProfile.IIIF1IMAGELEVEL1PROFILE.toString() ||
                  p === Manifesto.ServiceProfile.IIIF1IMAGELEVEL2.toString() ||
                  p === Manifesto.ServiceProfile.IIIF1IMAGELEVEL2PROFILE.toString()) {
                  return 'native';
              }
              return 'default';
          };
          Utils.getInexactLocale = function (locale) {
              if (locale.indexOf('-') !== -1) {
                  return locale.substr(0, locale.indexOf('-'));
              }
              return locale;
          };
          Utils.getLocalisedValue = function (resource, locale) {
              // if the resource is not an array of translations, return the string.
              if (!Array.isArray(resource)) {
                  return resource;
              }
              // test for exact match
              for (var i = 0; i < resource.length; i++) {
                  var value_1 = resource[i];
                  var language_1 = value_1['@language'];
                  if (locale === language_1) {
                      return value_1['@value'];
                  }
              }
              // test for inexact match
              var match = locale.substr(0, locale.indexOf('-'));
              for (var i = 0; i < resource.length; i++) {
                  var value = resource[i];
                  var language = value['@language'];
                  if (language === match) {
                      return value['@value'];
                  }
              }
              return null;
          };
          Utils.generateTreeNodeIds = function (treeNode, index) {
              if (index === void 0) { index = 0; }
              var id;
              if (!treeNode.parentNode) {
                  id = '0';
              }
              else {
                  id = treeNode.parentNode.id + "-" + index;
              }
              treeNode.id = id;
              for (var i = 0; i < treeNode.nodes.length; i++) {
                  var n = treeNode.nodes[i];
                  Utils.generateTreeNodeIds(n, i);
              }
          };
          Utils.normaliseType = function (type) {
              type = type.toLowerCase();
              if (type.indexOf(':') !== -1) {
                  var split = type.split(':');
                  return split[1];
              }
              return type;
          };
          Utils.normaliseUrl = function (url) {
              url = url.substr(url.indexOf('://'));
              if (url.indexOf('#') !== -1) {
                  url = url.split('#')[0];
              }
              return url;
          };
          Utils.normalisedUrlsMatch = function (url1, url2) {
              return Utils.normaliseUrl(url1) === Utils.normaliseUrl(url2);
          };
          Utils.isImageProfile = function (profile) {
              if (Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL0PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL1PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL2PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL0PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL1PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL2PROFILE.toString())) {
                  return true;
              }
              return false;
          };
          Utils.isLevel0ImageProfile = function (profile) {
              if (Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL0PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL0.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL0PROFILE.toString())) {
                  return true;
              }
              return false;
          };
          Utils.isLevel1ImageProfile = function (profile) {
              if (Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL1PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL1.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL1PROFILE.toString())) {
                  return true;
              }
              return false;
          };
          Utils.isLevel2ImageProfile = function (profile) {
              if (Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECOMPLIANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECOMPLIANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIFIMAGECONFORMANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.STANFORDIIIF1IMAGECONFORMANCE2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF1IMAGELEVEL2PROFILE.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL2.toString()) ||
                  Utils.normalisedUrlsMatch(profile.toString(), Manifesto.ServiceProfile.IIIF2IMAGELEVEL2PROFILE.toString())) {
                  return true;
              }
              return false;
          };
          Utils.loadResource = function (uri) {
              return new Promise(function (resolve, reject) {
                  var u = url.parse(uri);
                  var req;
                  var opts = {
                      host: u.hostname,
                      port: u.port,
                      path: u.path,
                      method: "GET",
                      withCredentials: false
                  };
                  switch (u.protocol) {
                      case 'https:':
                          req = https.request(opts, function (response) {
                              var result = "";
                              response.on('data', function (chunk) {
                                  result += chunk;
                              });
                              response.on('end', function () {
                                  resolve(result);
                              });
                          });
                          req.on('error', function (error) {
                              reject(error);
                          });
                          req.end();
                          break;
                      case 'dat:':
                          var xhr_1 = new XMLHttpRequest();
                          xhr_1.onreadystatechange = function () {
                              if (xhr_1.readyState === 4) {
                                  resolve(xhr_1.response);
                              }
                          };
                          xhr_1.open("GET", uri, true);
                          xhr_1.send();
                          break;
                      default:
                          req = http.request(opts, function (response) {
                              var result = "";
                              response.on('data', function (chunk) {
                                  result += chunk;
                              });
                              response.on('end', function () {
                                  resolve(result);
                              });
                          });
                          req.on('error', function (error) {
                              reject(error);
                          });
                          req.end();
                          break;
                  }
              });
          };
          Utils.loadExternalResourcesAuth1 = function (resources, openContentProviderInteraction, openTokenService, getStoredAccessToken, userInteractedWithContentProvider, getContentProviderInteraction, handleMovedTemporarily, showOutOfOptionsMessages) {
              return new Promise(function (resolve, reject) {
                  var promises = resources.map(function (resource) {
                      return Utils.loadExternalResourceAuth1(resource, openContentProviderInteraction, openTokenService, getStoredAccessToken, userInteractedWithContentProvider, getContentProviderInteraction, handleMovedTemporarily, showOutOfOptionsMessages);
                  });
                  Promise.all(promises)
                      .then(function () {
                      resolve(resources);
                  })["catch"](function (error) {
                      reject(error);
                  });
              });
          };
          Utils.loadExternalResourceAuth1 = function (resource, openContentProviderInteraction, openTokenService, getStoredAccessToken, userInteractedWithContentProvider, getContentProviderInteraction, handleMovedTemporarily, showOutOfOptionsMessages) {
              return __awaiter(this, void 0, void 0, function () {
                  var storedAccessToken;
                  return __generator(this, function (_a) {
                      switch (_a.label) {
                          case 0: return [4 /*yield*/, getStoredAccessToken(resource)];
                          case 1:
                              storedAccessToken = _a.sent();
                              if (!storedAccessToken) return [3 /*break*/, 6];
                              return [4 /*yield*/, resource.getData(storedAccessToken)];
                          case 2:
                              _a.sent();
                              if (!(resource.status === HTTPStatusCode.OK)) return [3 /*break*/, 3];
                              return [2 /*return*/, resource];
                          case 3: 
                          // the stored token is no good for this resource
                          return [4 /*yield*/, Utils.doAuthChain(resource, openContentProviderInteraction, openTokenService, userInteractedWithContentProvider, getContentProviderInteraction, handleMovedTemporarily, showOutOfOptionsMessages)];
                          case 4:
                              // the stored token is no good for this resource
                              _a.sent();
                              _a.label = 5;
                          case 5:
                              if (resource.status === HTTPStatusCode.OK || resource.status === HTTPStatusCode.MOVED_TEMPORARILY) {
                                  return [2 /*return*/, resource];
                              }
                              throw Utils.createAuthorizationFailedError();
                          case 6: return [4 /*yield*/, resource.getData()];
                          case 7:
                              _a.sent();
                              if (!(resource.status === HTTPStatusCode.MOVED_TEMPORARILY || resource.status === HTTPStatusCode.UNAUTHORIZED)) return [3 /*break*/, 9];
                              return [4 /*yield*/, Utils.doAuthChain(resource, openContentProviderInteraction, openTokenService, userInteractedWithContentProvider, getContentProviderInteraction, handleMovedTemporarily, showOutOfOptionsMessages)];
                          case 8:
                              _a.sent();
                              _a.label = 9;
                          case 9:
                              if (resource.status === HTTPStatusCode.OK || resource.status === HTTPStatusCode.MOVED_TEMPORARILY) {
                                  return [2 /*return*/, resource];
                              }
                              throw Utils.createAuthorizationFailedError();
                      }
                  });
              });
          };
          Utils.doAuthChain = function (resource, openContentProviderInteraction, openTokenService, userInteractedWithContentProvider, getContentProviderInteraction, handleMovedTemporarily, showOutOfOptionsMessages) {
              return __awaiter(this, void 0, void 0, function () {
                  var externalService, kioskService, clickThroughService, loginService, serviceToTry, lastAttempted, kioskInteraction, contentProviderInteraction, contentProviderInteraction;
                  return __generator(this, function (_a) {
                      switch (_a.label) {
                          case 0:
                              // This function enters the flowchart at the < External? > junction
                              // http://iiif.io/api/auth/1.0/#workflow-from-the-browser-client-perspective
                              if (!resource.isAccessControlled()) {
                                  return [2 /*return*/, resource]; // no services found
                              }
                              externalService = resource.externalService;
                              if (externalService) {
                                  externalService.options = resource.options;
                              }
                              kioskService = resource.kioskService;
                              if (kioskService) {
                                  kioskService.options = resource.options;
                              }
                              clickThroughService = resource.clickThroughService;
                              if (clickThroughService) {
                                  clickThroughService.options = resource.options;
                              }
                              loginService = resource.loginService;
                              if (loginService) {
                                  loginService.options = resource.options;
                              }
                              if (!(!resource.isResponseHandled && resource.status === HTTPStatusCode.MOVED_TEMPORARILY)) return [3 /*break*/, 2];
                              return [4 /*yield*/, handleMovedTemporarily(resource)];
                          case 1:
                              _a.sent();
                              return [2 /*return*/, resource];
                          case 2:
                              serviceToTry = null;
                              lastAttempted = null;
                              // repetition of logic is left in these steps for clarity:
                              // Looking for external pattern
                              serviceToTry = externalService;
                              if (!serviceToTry) return [3 /*break*/, 4];
                              lastAttempted = serviceToTry;
                              return [4 /*yield*/, Utils.attemptResourceWithToken(resource, openTokenService, serviceToTry)];
                          case 3:
                              _a.sent();
                              return [2 /*return*/, resource];
                          case 4:
                              // Looking for kiosk pattern
                              serviceToTry = kioskService;
                              if (!serviceToTry) return [3 /*break*/, 7];
                              lastAttempted = serviceToTry;
                              kioskInteraction = openContentProviderInteraction(serviceToTry);
                              if (!kioskInteraction) return [3 /*break*/, 7];
                              return [4 /*yield*/, userInteractedWithContentProvider(kioskInteraction)];
                          case 5:
                              _a.sent();
                              return [4 /*yield*/, Utils.attemptResourceWithToken(resource, openTokenService, serviceToTry)];
                          case 6:
                              _a.sent();
                              return [2 /*return*/, resource];
                          case 7:
                              // The code for the next two patterns is identical (other than the profile name).
                              // The difference is in the expected behaviour of
                              //
                              //    await userInteractedWithContentProvider(contentProviderInteraction);
                              // 
                              // For clickthrough the opened window should close immediately having established
                              // a session, whereas for login the user might spend some time entering credentials etc.
                              // Looking for clickthrough pattern
                              serviceToTry = clickThroughService;
                              if (!serviceToTry) return [3 /*break*/, 11];
                              lastAttempted = serviceToTry;
                              return [4 /*yield*/, getContentProviderInteraction(resource, serviceToTry)];
                          case 8:
                              contentProviderInteraction = _a.sent();
                              if (!contentProviderInteraction) return [3 /*break*/, 11];
                              // should close immediately
                              return [4 /*yield*/, userInteractedWithContentProvider(contentProviderInteraction)];
                          case 9:
                              // should close immediately
                              _a.sent();
                              return [4 /*yield*/, Utils.attemptResourceWithToken(resource, openTokenService, serviceToTry)];
                          case 10:
                              _a.sent();
                              return [2 /*return*/, resource];
                          case 11:
                              // Looking for login pattern
                              serviceToTry = loginService;
                              if (!serviceToTry) return [3 /*break*/, 15];
                              lastAttempted = serviceToTry;
                              return [4 /*yield*/, getContentProviderInteraction(resource, serviceToTry)];
                          case 12:
                              contentProviderInteraction = _a.sent();
                              if (!contentProviderInteraction) return [3 /*break*/, 15];
                              // we expect the user to spend some time interacting
                              return [4 /*yield*/, userInteractedWithContentProvider(contentProviderInteraction)];
                          case 13:
                              // we expect the user to spend some time interacting
                              _a.sent();
                              return [4 /*yield*/, Utils.attemptResourceWithToken(resource, openTokenService, serviceToTry)];
                          case 14:
                              _a.sent();
                              return [2 /*return*/, resource];
                          case 15:
                              // nothing worked! Use the most recently tried service as the source of
                              // messages to show to the user.
                              if (lastAttempted) {
                                  showOutOfOptionsMessages(resource, lastAttempted);
                              }
                              return [2 /*return*/];
                      }
                  });
              });
          };
          Utils.attemptResourceWithToken = function (resource, openTokenService, authService) {
              return __awaiter(this, void 0, void 0, function () {
                  var tokenService, tokenMessage;
                  return __generator(this, function (_a) {
                      switch (_a.label) {
                          case 0:
                              tokenService = authService.getService(Manifesto.ServiceProfile.AUTH1TOKEN.toString());
                              if (!tokenService) return [3 /*break*/, 3];
                              return [4 /*yield*/, openTokenService(resource, tokenService)];
                          case 1:
                              tokenMessage = _a.sent();
                              if (!(tokenMessage && tokenMessage.accessToken)) return [3 /*break*/, 3];
                              return [4 /*yield*/, resource.getData(tokenMessage)];
                          case 2:
                              _a.sent();
                              return [2 /*return*/, resource];
                          case 3: return [2 /*return*/];
                      }
                  });
              });
          };
          Utils.loadExternalResourcesAuth09 = function (resources, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, getStoredAccessToken, handleResourceResponse, options) {
              return new Promise(function (resolve, reject) {
                  var promises = resources.map(function (resource) {
                      return Utils.loadExternalResourceAuth09(resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, getStoredAccessToken, handleResourceResponse, options);
                  });
                  Promise.all(promises)
                      .then(function () {
                      resolve(resources);
                  })["catch"](function (error) {
                      reject(error);
                  });
              });
          };
          // IIIF auth api pre v1.0
          // Keeping this around for now until the auth 1.0 implementation is stable
          Utils.loadExternalResourceAuth09 = function (resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, getStoredAccessToken, handleResourceResponse, options) {
              return new Promise(function (resolve, reject) {
                  if (options && options.pessimisticAccessControl) {
                      // pessimistic: access control cookies may have been deleted.
                      // always request the access token for every access controlled info.json request
                      // returned access tokens are not stored, therefore the login window flashes for every request.
                      resource.getData().then(function () {
                          if (resource.isAccessControlled()) {
                              // if the resource has a click through service, use that.
                              if (resource.clickThroughService) {
                                  resolve(clickThrough(resource));
                                  //} else if(resource.restrictedService) {
                                  resolve(restricted(resource));
                              }
                              else {
                                  login(resource).then(function () {
                                      getAccessToken(resource, true).then(function (token) {
                                          resource.getData(token).then(function () {
                                              resolve(handleResourceResponse(resource));
                                          })["catch"](function (message) {
                                              reject(Utils.createInternalServerError(message));
                                          });
                                      })["catch"](function (message) {
                                          reject(Utils.createInternalServerError(message));
                                      });
                                  })["catch"](function (message) {
                                      reject(Utils.createInternalServerError(message));
                                  });
                              }
                          }
                          else {
                              // this info.json isn't access controlled, therefore no need to request an access token.
                              resolve(resource);
                          }
                      })["catch"](function (message) {
                          reject(Utils.createInternalServerError(message));
                      });
                  }
                  else {
                      // optimistic: access control cookies may not have been deleted.
                      // store access tokens to avoid login window flashes.
                      // if cookies are deleted a page refresh is required.
                      // try loading the resource using an access token that matches the info.json domain.
                      // if an access token is found, request the resource using it regardless of whether it is access controlled.
                      getStoredAccessToken(resource, tokenStorageStrategy).then(function (storedAccessToken) {
                          if (storedAccessToken) {
                              // try using the stored access token
                              resource.getData(storedAccessToken).then(function () {
                                  // if the info.json loaded using the stored access token
                                  if (resource.status === HTTPStatusCode.OK) {
                                      resolve(handleResourceResponse(resource));
                                  }
                                  else {
                                      // otherwise, load the resource data to determine the correct access control services.
                                      // if access controlled, do login.
                                      Utils.authorize(resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, getStoredAccessToken).then(function () {
                                          resolve(handleResourceResponse(resource));
                                      })["catch"](function (error) {
                                          // if (resource.restrictedService){
                                          //     reject(Utils.createRestrictedError());
                                          // } else {
                                          reject(Utils.createAuthorizationFailedError());
                                          //}
                                      });
                                  }
                              })["catch"](function (error) {
                                  reject(Utils.createAuthorizationFailedError());
                              });
                          }
                          else {
                              Utils.authorize(resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, getStoredAccessToken).then(function () {
                                  resolve(handleResourceResponse(resource));
                              })["catch"](function (error) {
                                  reject(Utils.createAuthorizationFailedError());
                              });
                          }
                      })["catch"](function (error) {
                          reject(Utils.createAuthorizationFailedError());
                      });
                  }
              });
          };
          Utils.createError = function (name, message) {
              var error = new Error();
              error.message = message;
              error.name = name;
              return error;
          };
          Utils.createAuthorizationFailedError = function () {
              return Utils.createError(manifesto.StatusCodes.AUTHORIZATION_FAILED.toString(), "Authorization failed");
          };
          Utils.createRestrictedError = function () {
              return Utils.createError(manifesto.StatusCodes.RESTRICTED.toString(), "Restricted");
          };
          Utils.createInternalServerError = function (message) {
              return Utils.createError(manifesto.StatusCodes.INTERNAL_SERVER_ERROR.toString(), message);
          };
          Utils.authorize = function (resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, getStoredAccessToken) {
              return new Promise(function (resolve, reject) {
                  resource.getData().then(function () {
                      if (resource.isAccessControlled()) {
                          getStoredAccessToken(resource, tokenStorageStrategy).then(function (storedAccessToken) {
                              if (storedAccessToken) {
                                  // try using the stored access token
                                  resource.getData(storedAccessToken).then(function () {
                                      if (resource.status === HTTPStatusCode.OK) {
                                          resolve(resource); // happy path ended
                                      }
                                      else {
                                          // the stored token is no good for this resource
                                          Utils.showAuthInteraction(resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, resolve, reject);
                                      }
                                  })["catch"](function (message) {
                                      reject(Utils.createInternalServerError(message));
                                  });
                              }
                              else {
                                  // There was no stored token, but the user might have a cookie that will grant a token
                                  getAccessToken(resource, false).then(function (accessToken) {
                                      if (accessToken) {
                                          storeAccessToken(resource, accessToken, tokenStorageStrategy).then(function () {
                                              // try using the fresh access token
                                              resource.getData(accessToken).then(function () {
                                                  if (resource.status === HTTPStatusCode.OK) {
                                                      resolve(resource);
                                                  }
                                                  else {
                                                      // User has a token, but it's not good enough
                                                      Utils.showAuthInteraction(resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, resolve, reject);
                                                  }
                                              })["catch"](function (message) {
                                                  reject(Utils.createInternalServerError(message));
                                              });
                                          })["catch"](function (message) {
                                              // not able to store access token
                                              reject(Utils.createInternalServerError(message));
                                          });
                                      }
                                      else {
                                          // The user did not have a cookie that granted a token
                                          Utils.showAuthInteraction(resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, resolve, reject);
                                      }
                                  });
                              }
                          })["catch"](function (message) {
                              reject(Utils.createInternalServerError(message));
                          });
                      }
                      else {
                          // this info.json isn't access controlled, therefore there's no need to request an access token
                          resolve(resource);
                      }
                  });
              });
          };
          Utils.showAuthInteraction = function (resource, tokenStorageStrategy, clickThrough, restricted, login, getAccessToken, storeAccessToken, resolve, reject) {
              if (resource.status === HTTPStatusCode.MOVED_TEMPORARILY && !resource.isResponseHandled) {
                  // if the resource was redirected to a degraded version
                  // and the response hasn't been handled yet.
                  // if the client wishes to trigger a login, set resource.isResponseHandled to true
                  // and call loadExternalResources() again passing the resource.
                  resolve(resource);
                  // } else if (resource.restrictedService) {
                  //     resolve(restricted(resource));
                  //     // TODO: move to next etc
              }
              else if (resource.clickThroughService && !resource.isResponseHandled) {
                  // if the resource has a click through service, use that.
                  clickThrough(resource).then(function () {
                      getAccessToken(resource, true).then(function (accessToken) {
                          storeAccessToken(resource, accessToken, tokenStorageStrategy).then(function () {
                              resource.getData(accessToken).then(function () {
                                  resolve(resource);
                              })["catch"](function (message) {
                                  reject(Utils.createInternalServerError(message));
                              });
                          })["catch"](function (message) {
                              reject(Utils.createInternalServerError(message));
                          });
                      })["catch"](function (message) {
                          reject(Utils.createInternalServerError(message));
                      });
                  });
              }
              else {
                  // get an access token
                  login(resource).then(function () {
                      getAccessToken(resource, true).then(function (accessToken) {
                          storeAccessToken(resource, accessToken, tokenStorageStrategy).then(function () {
                              resource.getData(accessToken).then(function () {
                                  resolve(resource);
                              })["catch"](function (message) {
                                  reject(Utils.createInternalServerError(message));
                              });
                          })["catch"](function (message) {
                              reject(Utils.createInternalServerError(message));
                          });
                      })["catch"](function (message) {
                          reject(Utils.createInternalServerError(message));
                      });
                  });
              }
          };
          ;
          Utils.getService = function (resource, profile) {
              var services = this.getServices(resource);
              // coerce profile to string
              if (typeof (profile) !== 'string') {
                  profile = profile.toString();
              }
              for (var i = 0; i < services.length; i++) {
                  var service = services[i];
                  if (service.getProfile().toString() === profile) {
                      return service;
                  }
              }
              return null;
          };
          Utils.getResourceById = function (parentResource, id) {
              return [parentResource.__jsonld].en().traverseUnique(function (x) { return Utils.getAllArrays(x); })
                  .first(function (r) { return r['@id'] === id; });
          };
          Utils.getAllArrays = function (obj) {
              var all = [].en();
              if (!obj)
                  return all;
              for (var key in obj) {
                  var val = obj[key];
                  if (Array.isArray(val)) {
                      all = all.concat(val);
                  }
              }
              return all;
          };
          Utils.getServices = function (resource) {
              var service;
              // if passing a manifesto-parsed object, use the __jsonld.service property,
              // otherwise look for a service property (info.json services)
              if (resource.__jsonld) {
                  service = resource.__jsonld.service;
              }
              else {
                  service = resource.service;
              }
              var services = [];
              if (!service)
                  return services;
              // coerce to array
              if (!Array.isArray(service)) {
                  service = [service];
              }
              for (var i = 0; i < service.length; i++) {
                  var s = service[i];
                  if (typeof (s) === 'string') {
                      var r = this.getResourceById(resource.options.resource, s);
                      if (r) {
                          services.push(new Manifesto.Service(r.__jsonld || r, resource.options));
                      }
                  }
                  else {
                      services.push(new Manifesto.Service(s, resource.options));
                  }
              }
              return services;
          };
          return Utils;
      }());
      Manifesto.Utils = Utils;
  })(Manifesto || (Manifesto = {}));
  
  var Manifesto;
  (function (Manifesto) {
      var MetadataItem = /** @class */ (function () {
          function MetadataItem(defaultLocale) {
              this.defaultLocale = defaultLocale;
          }
          MetadataItem.prototype.parse = function (resource) {
              this.resource = resource;
              this.label = Manifesto.TranslationCollection.parse(this.resource.label, this.defaultLocale);
              this.value = Manifesto.TranslationCollection.parse(this.resource.value, this.defaultLocale);
          };
          // shortcuts to get/set values based on default locale
          MetadataItem.prototype.getLabel = function () {
              if (this.label) {
                  return Manifesto.TranslationCollection.getValue(this.label, this.defaultLocale);
              }
              return null;
          };
          MetadataItem.prototype.setLabel = function (value) {
              var _this = this;
              if (this.label && this.label.length) {
                  var t = this.label.en().where(function (x) { return x.locale === _this.defaultLocale || x.locale === Manifesto.Utils.getInexactLocale(_this.defaultLocale); }).first();
                  if (t)
                      t.value = value;
              }
          };
          MetadataItem.prototype.getValue = function () {
              if (this.value) {
                  var locale = this.defaultLocale;
                  // if the label has a locale, prefer that to the default locale
                  if (this.label.length && this.label[0].locale) {
                      locale = this.label[0].locale;
                  }
                  return Manifesto.TranslationCollection.getValue(this.value, locale);
              }
              return null;
          };
          MetadataItem.prototype.setValue = function (value) {
              var _this = this;
              if (this.value && this.value.length) {
                  var t = this.value.en().where(function (x) { return x.locale === _this.defaultLocale || x.locale === Manifesto.Utils.getInexactLocale(_this.defaultLocale); }).first();
                  if (t)
                      t.value = value;
              }
          };
          return MetadataItem;
      }());
      Manifesto.MetadataItem = MetadataItem;
  })(Manifesto || (Manifesto = {}));
  
  var Manifesto;
  (function (Manifesto) {
      var Translation = /** @class */ (function () {
          function Translation(value, locale) {
              this.value = value;
              this.locale = locale;
          }
          return Translation;
      }());
      Manifesto.Translation = Translation;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var TranslationCollection = /** @class */ (function (_super) {
          __extends(TranslationCollection, _super);
          function TranslationCollection() {
              return _super !== null && _super.apply(this, arguments) || this;
          }
          TranslationCollection.parse = function (translation, defaultLocale) {
              var tc = [];
              var t;
              if (!translation) {
                  return tc;
              }
              else if (Array.isArray(translation)) {
                  for (var i = 0; i < translation.length; i++) {
                      var value = translation[i];
                      if (typeof (value) === 'string') {
                          t = new Manifesto.Translation(value, defaultLocale);
                      }
                      else {
                          t = new Manifesto.Translation(value['@value'], value['@language'] || defaultLocale);
                      }
                      tc.push(t);
                  }
              }
              else if (typeof (translation) === 'string') {
                  // if it's just a single string value, create one translation in the configured locale
                  t = new Manifesto.Translation(translation, defaultLocale);
                  tc.push(t);
                  return tc;
              }
              else {
                  // it's an object
                  if (translation['@value']) {
                      // presentation 2
                      t = new Manifesto.Translation(translation['@value'], translation['@language'] || defaultLocale);
                      tc.push(t);
                  }
                  else {
                      // presentation 3
                      Object.keys(translation).forEach(function (key) {
                          // todo: support multiple values in array
                          if (translation[key].length) {
                              t = new Manifesto.Translation(translation[key][0], key);
                              tc.push(t);
                          }
                          else {
                              throw new Error('Translation must have a value');
                          }
                      });
                  }
              }
              return tc;
          };
          TranslationCollection.getValue = function (translationCollection, locale) {
              if (translationCollection.length) {
                  if (locale) {
                      var translation = translationCollection.en().where(function (t) { return t.locale === locale || Manifesto.Utils.getInexactLocale(t.locale) === Manifesto.Utils.getInexactLocale(locale); }).first();
                      if (translation) {
                          return translation.value;
                      }
                  }
                  // return the first valuel
                  return translationCollection[0].value;
              }
              return null;
          };
          return TranslationCollection;
      }(Array));
      Manifesto.TranslationCollection = TranslationCollection;
  })(Manifesto || (Manifesto = {}));
  
  var Manifesto;
  (function (Manifesto) {
      var Size = /** @class */ (function () {
          function Size(width, height) {
              this.width = width;
              this.height = height;
          }
          return Size;
      }());
      Manifesto.Size = Size;
  })(Manifesto || (Manifesto = {}));
  
  /// <reference types="http-status-codes" />
  global.manifesto = global.Manifesto = module.exports = {
      AnnotationMotivation: new Manifesto.AnnotationMotivation(),
      Behavior: new Manifesto.Behavior(),
      IIIFResourceType: new Manifesto.IIIFResourceType(),
      ManifestType: new Manifesto.ManifestType(),
      MediaType: new Manifesto.MediaType(),
      MetadataItem: Manifesto.MetadataItem,
      RenderingFormat: new Manifesto.RenderingFormat(),
      ResourceType: new Manifesto.ResourceType(),
      ServiceProfile: new Manifesto.ServiceProfile(),
      Size: Manifesto.Size,
      Translation: Manifesto.Translation,
      TranslationCollection: Manifesto.TranslationCollection,
      TreeNode: Manifesto.TreeNode,
      TreeNodeType: new Manifesto.TreeNodeType(),
      Utils: Manifesto.Utils,
      ViewingDirection: new Manifesto.ViewingDirection(),
      ViewingHint: new Manifesto.ViewingHint(),
      StatusCodes: {
          AUTHORIZATION_FAILED: 1,
          FORBIDDEN: 2,
          INTERNAL_SERVER_ERROR: 3,
          RESTRICTED: 4
      },
      create: function (manifest, options) {
          return Manifesto.Deserialiser.parse(manifest, options);
      },
      loadManifest: function (uri) {
          return Manifesto.Utils.loadResource(uri);
      }
  };
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Annotation = /** @class */ (function (_super) {
          __extends(Annotation, _super);
          function Annotation(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          Annotation.prototype.getBody = function () {
              var bodies = [];
              var body = this.getProperty('body');
              // todo: make this a generic "property that can be an object or array enumerator" util
              if (body) {
                  if (Array.isArray(body)) {
                      for (var i = 0; i < body.length; i++) {
                          var b = body[i];
                          if (b.items) {
                              for (var i_1 = 0; i_1 < b.items.length; i_1++) {
                                  var c = b.items[i_1];
                                  bodies.push(new Manifesto.AnnotationBody(c, this.options));
                              }
                          }
                          else {
                              bodies.push(new Manifesto.AnnotationBody(b, this.options));
                          }
                      }
                  }
                  else if (body.items) {
                      for (var i = 0; i < body.items.length; i++) {
                          var b = body.items[i];
                          bodies.push(new Manifesto.AnnotationBody(b, this.options));
                      }
                  }
                  else {
                      bodies.push(new Manifesto.AnnotationBody(body, this.options));
                  }
              }
              return bodies;
          };
          Annotation.prototype.getMotivation = function () {
              var motivation = this.getProperty('motivation');
              if (motivation) {
                  return new Manifesto.AnnotationMotivation(motivation.toLowerCase());
              }
              return null;
          };
          // open annotation
          Annotation.prototype.getOn = function () {
              return this.getProperty('on');
          };
          Annotation.prototype.getTarget = function () {
              return this.getProperty('target');
          };
          Annotation.prototype.getResource = function () {
              return new Manifesto.Resource(this.getProperty('resource'), this.options);
          };
          return Annotation;
      }(Manifesto.ManifestResource));
      Manifesto.Annotation = Annotation;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var AnnotationBody = /** @class */ (function (_super) {
          __extends(AnnotationBody, _super);
          function AnnotationBody(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          AnnotationBody.prototype.getFormat = function () {
              var format = this.getProperty('format');
              if (format) {
                  return new Manifesto.MediaType(Manifesto.Utils.getMediaType(format));
              }
              return null;
          };
          AnnotationBody.prototype.getType = function () {
              var type = this.getProperty('type');
              if (type) {
                  return new Manifesto.ResourceType(Manifesto.Utils.normaliseType(this.getProperty('type')));
              }
              return null;
          };
          return AnnotationBody;
      }(Manifesto.ManifestResource));
      Manifesto.AnnotationBody = AnnotationBody;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var AnnotationList = /** @class */ (function (_super) {
          __extends(AnnotationList, _super);
          function AnnotationList(label, jsonld, options) {
              var _this = _super.call(this, jsonld) || this;
              _this.label = label;
              _this.options = options;
              return _this;
          }
          AnnotationList.prototype.getIIIFResourceType = function () {
              return new Manifesto.IIIFResourceType(Manifesto.Utils.normaliseType(this.getProperty('type')));
          };
          AnnotationList.prototype.getLabel = function () {
              return this.label;
          };
          AnnotationList.prototype.getResources = function () {
              var _this = this;
              var resources = this.getProperty('resources');
              return resources.map(function (resource) { return new Manifesto.Annotation(resource, _this.options); });
          };
          AnnotationList.prototype.load = function () {
              var _this = this;
              return new Promise(function (resolve, reject) {
                  if (_this.isLoaded) {
                      resolve(_this);
                  }
                  else {
                      var id = _this.__jsonld.id;
                      if (!id) {
                          id = _this.__jsonld['@id'];
                      }
                      Manifesto.Utils.loadResource(id).then(function (data) {
                          _this.__jsonld = JSON.parse(data);
                          _this.context = _this.getProperty('context');
                          _this.id = _this.getProperty('id');
                          _this.isLoaded = true;
                          resolve(_this);
                      }).catch(reject);
                  }
              });
          };
          return AnnotationList;
      }(Manifesto.JSONLDResource));
      Manifesto.AnnotationList = AnnotationList;
  })(Manifesto || (Manifesto = {}));
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var AnnotationPage = /** @class */ (function (_super) {
          __extends(AnnotationPage, _super);
          function AnnotationPage(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          AnnotationPage.prototype.getItems = function () {
              return this.getProperty('items');
          };
          return AnnotationPage;
      }(Manifesto.ManifestResource));
      Manifesto.AnnotationPage = AnnotationPage;
  })(Manifesto || (Manifesto = {}));
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  var __extends = (this && this.__extends) || (function () {
      var extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return function (d, b) {
          extendStatics(d, b);
          function __() { this.constructor = d; }
          d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
      };
  })();
  var Manifesto;
  (function (Manifesto) {
      var Thumbnail = /** @class */ (function (_super) {
          __extends(Thumbnail, _super);
          function Thumbnail(jsonld, options) {
              return _super.call(this, jsonld, options) || this;
          }
          return Thumbnail;
      }(Manifesto.Resource));
      Manifesto.Thumbnail = Thumbnail;
  })(Manifesto || (Manifesto = {}));
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"http":30,"https":8,"url":35}],2:[function(require,module,exports){
  'use strict'
  
  exports.byteLength = byteLength
  exports.toByteArray = toByteArray
  exports.fromByteArray = fromByteArray
  
  var lookup = []
  var revLookup = []
  var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
  
  var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  for (var i = 0, len = code.length; i < len; ++i) {
    lookup[i] = code[i]
    revLookup[code.charCodeAt(i)] = i
  }
  
  revLookup['-'.charCodeAt(0)] = 62
  revLookup['_'.charCodeAt(0)] = 63
  
  function placeHoldersCount (b64) {
    var len = b64.length
    if (len % 4 > 0) {
      throw new Error('Invalid string. Length must be a multiple of 4')
    }
  
    // the number of equal signs (place holders)
    // if there are two placeholders, than the two characters before it
    // represent one byte
    // if there is only one, then the three characters before it represent 2 bytes
    // this is just a cheap hack to not do indexOf twice
    return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
  }
  
  function byteLength (b64) {
    // base64 is 4/3 + up to two characters of the original data
    return (b64.length * 3 / 4) - placeHoldersCount(b64)
  }
  
  function toByteArray (b64) {
    var i, l, tmp, placeHolders, arr
    var len = b64.length
    placeHolders = placeHoldersCount(b64)
  
    arr = new Arr((len * 3 / 4) - placeHolders)
  
    // if there are placeholders, only get up to the last complete 4 chars
    l = placeHolders > 0 ? len - 4 : len
  
    var L = 0
  
    for (i = 0; i < l; i += 4) {
      tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
      arr[L++] = (tmp >> 16) & 0xFF
      arr[L++] = (tmp >> 8) & 0xFF
      arr[L++] = tmp & 0xFF
    }
  
    if (placeHolders === 2) {
      tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
      arr[L++] = tmp & 0xFF
    } else if (placeHolders === 1) {
      tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
      arr[L++] = (tmp >> 8) & 0xFF
      arr[L++] = tmp & 0xFF
    }
  
    return arr
  }
  
  function tripletToBase64 (num) {
    return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
  }
  
  function encodeChunk (uint8, start, end) {
    var tmp
    var output = []
    for (var i = start; i < end; i += 3) {
      tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
      output.push(tripletToBase64(tmp))
    }
    return output.join('')
  }
  
  function fromByteArray (uint8) {
    var tmp
    var len = uint8.length
    var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
    var output = ''
    var parts = []
    var maxChunkLength = 16383 // must be multiple of 3
  
    // go through the array every three bytes, we'll deal with trailing stuff later
    for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
      parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
    }
  
    // pad the end with zeros, but make sure to not forget the extra bytes
    if (extraBytes === 1) {
      tmp = uint8[len - 1]
      output += lookup[tmp >> 2]
      output += lookup[(tmp << 4) & 0x3F]
      output += '=='
    } else if (extraBytes === 2) {
      tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
      output += lookup[tmp >> 10]
      output += lookup[(tmp >> 4) & 0x3F]
      output += lookup[(tmp << 2) & 0x3F]
      output += '='
    }
  
    parts.push(output)
  
    return parts.join('')
  }
  
  },{}],3:[function(require,module,exports){
  
  },{}],4:[function(require,module,exports){
  (function (global){
  /*!
   * The buffer module from node.js, for the browser.
   *
   * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
   * @license  MIT
   */
  /* eslint-disable no-proto */
  
  'use strict'
  
  var base64 = require('base64-js')
  var ieee754 = require('ieee754')
  var isArray = require('isarray')
  
  exports.Buffer = Buffer
  exports.SlowBuffer = SlowBuffer
  exports.INSPECT_MAX_BYTES = 50
  
  /**
   * If `Buffer.TYPED_ARRAY_SUPPORT`:
   *   === true    Use Uint8Array implementation (fastest)
   *   === false   Use Object implementation (most compatible, even IE6)
   *
   * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
   * Opera 11.6+, iOS 4.2+.
   *
   * Due to various browser bugs, sometimes the Object implementation will be used even
   * when the browser supports typed arrays.
   *
   * Note:
   *
   *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
   *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
   *
   *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
   *
   *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
   *     incorrect length in some situations.
  
   * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
   * get the Object implementation, which is slower but behaves correctly.
   */
  Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
    ? global.TYPED_ARRAY_SUPPORT
    : typedArraySupport()
  
  /*
   * Export kMaxLength after typed array support is determined.
   */
  exports.kMaxLength = kMaxLength()
  
  function typedArraySupport () {
    try {
      var arr = new Uint8Array(1)
      arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
      return arr.foo() === 42 && // typed array instances can be augmented
          typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
          arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
    } catch (e) {
      return false
    }
  }
  
  function kMaxLength () {
    return Buffer.TYPED_ARRAY_SUPPORT
      ? 0x7fffffff
      : 0x3fffffff
  }
  
  function createBuffer (that, length) {
    if (kMaxLength() < length) {
      throw new RangeError('Invalid typed array length')
    }
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      // Return an augmented `Uint8Array` instance, for best performance
      that = new Uint8Array(length)
      that.__proto__ = Buffer.prototype
    } else {
      // Fallback: Return an object instance of the Buffer class
      if (that === null) {
        that = new Buffer(length)
      }
      that.length = length
    }
  
    return that
  }
  
  /**
   * The Buffer constructor returns instances of `Uint8Array` that have their
   * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
   * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
   * and the `Uint8Array` methods. Square bracket notation works as expected -- it
   * returns a single octet.
   *
   * The `Uint8Array` prototype remains unmodified.
   */
  
  function Buffer (arg, encodingOrOffset, length) {
    if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
      return new Buffer(arg, encodingOrOffset, length)
    }
  
    // Common case.
    if (typeof arg === 'number') {
      if (typeof encodingOrOffset === 'string') {
        throw new Error(
          'If encoding is specified then the first argument must be a string'
        )
      }
      return allocUnsafe(this, arg)
    }
    return from(this, arg, encodingOrOffset, length)
  }
  
  Buffer.poolSize = 8192 // not used by this implementation
  
  // TODO: Legacy, not needed anymore. Remove in next major version.
  Buffer._augment = function (arr) {
    arr.__proto__ = Buffer.prototype
    return arr
  }
  
  function from (that, value, encodingOrOffset, length) {
    if (typeof value === 'number') {
      throw new TypeError('"value" argument must not be a number')
    }
  
    if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
      return fromArrayBuffer(that, value, encodingOrOffset, length)
    }
  
    if (typeof value === 'string') {
      return fromString(that, value, encodingOrOffset)
    }
  
    return fromObject(that, value)
  }
  
  /**
   * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
   * if value is a number.
   * Buffer.from(str[, encoding])
   * Buffer.from(array)
   * Buffer.from(buffer)
   * Buffer.from(arrayBuffer[, byteOffset[, length]])
   **/
  Buffer.from = function (value, encodingOrOffset, length) {
    return from(null, value, encodingOrOffset, length)
  }
  
  if (Buffer.TYPED_ARRAY_SUPPORT) {
    Buffer.prototype.__proto__ = Uint8Array.prototype
    Buffer.__proto__ = Uint8Array
    if (typeof Symbol !== 'undefined' && Symbol.species &&
        Buffer[Symbol.species] === Buffer) {
      // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
      Object.defineProperty(Buffer, Symbol.species, {
        value: null,
        configurable: true
      })
    }
  }
  
  function assertSize (size) {
    if (typeof size !== 'number') {
      throw new TypeError('"size" argument must be a number')
    } else if (size < 0) {
      throw new RangeError('"size" argument must not be negative')
    }
  }
  
  function alloc (that, size, fill, encoding) {
    assertSize(size)
    if (size <= 0) {
      return createBuffer(that, size)
    }
    if (fill !== undefined) {
      // Only pay attention to encoding if it's a string. This
      // prevents accidentally sending in a number that would
      // be interpretted as a start offset.
      return typeof encoding === 'string'
        ? createBuffer(that, size).fill(fill, encoding)
        : createBuffer(that, size).fill(fill)
    }
    return createBuffer(that, size)
  }
  
  /**
   * Creates a new filled Buffer instance.
   * alloc(size[, fill[, encoding]])
   **/
  Buffer.alloc = function (size, fill, encoding) {
    return alloc(null, size, fill, encoding)
  }
  
  function allocUnsafe (that, size) {
    assertSize(size)
    that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)
    if (!Buffer.TYPED_ARRAY_SUPPORT) {
      for (var i = 0; i < size; ++i) {
        that[i] = 0
      }
    }
    return that
  }
  
  /**
   * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
   * */
  Buffer.allocUnsafe = function (size) {
    return allocUnsafe(null, size)
  }
  /**
   * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
   */
  Buffer.allocUnsafeSlow = function (size) {
    return allocUnsafe(null, size)
  }
  
  function fromString (that, string, encoding) {
    if (typeof encoding !== 'string' || encoding === '') {
      encoding = 'utf8'
    }
  
    if (!Buffer.isEncoding(encoding)) {
      throw new TypeError('"encoding" must be a valid string encoding')
    }
  
    var length = byteLength(string, encoding) | 0
    that = createBuffer(that, length)
  
    var actual = that.write(string, encoding)
  
    if (actual !== length) {
      // Writing a hex string, for example, that contains invalid characters will
      // cause everything after the first invalid character to be ignored. (e.g.
      // 'abxxcd' will be treated as 'ab')
      that = that.slice(0, actual)
    }
  
    return that
  }
  
  function fromArrayLike (that, array) {
    var length = array.length < 0 ? 0 : checked(array.length) | 0
    that = createBuffer(that, length)
    for (var i = 0; i < length; i += 1) {
      that[i] = array[i] & 255
    }
    return that
  }
  
  function fromArrayBuffer (that, array, byteOffset, length) {
    array.byteLength // this throws if `array` is not a valid ArrayBuffer
  
    if (byteOffset < 0 || array.byteLength < byteOffset) {
      throw new RangeError('\'offset\' is out of bounds')
    }
  
    if (array.byteLength < byteOffset + (length || 0)) {
      throw new RangeError('\'length\' is out of bounds')
    }
  
    if (byteOffset === undefined && length === undefined) {
      array = new Uint8Array(array)
    } else if (length === undefined) {
      array = new Uint8Array(array, byteOffset)
    } else {
      array = new Uint8Array(array, byteOffset, length)
    }
  
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      // Return an augmented `Uint8Array` instance, for best performance
      that = array
      that.__proto__ = Buffer.prototype
    } else {
      // Fallback: Return an object instance of the Buffer class
      that = fromArrayLike(that, array)
    }
    return that
  }
  
  function fromObject (that, obj) {
    if (Buffer.isBuffer(obj)) {
      var len = checked(obj.length) | 0
      that = createBuffer(that, len)
  
      if (that.length === 0) {
        return that
      }
  
      obj.copy(that, 0, 0, len)
      return that
    }
  
    if (obj) {
      if ((typeof ArrayBuffer !== 'undefined' &&
          obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
        if (typeof obj.length !== 'number' || isnan(obj.length)) {
          return createBuffer(that, 0)
        }
        return fromArrayLike(that, obj)
      }
  
      if (obj.type === 'Buffer' && isArray(obj.data)) {
        return fromArrayLike(that, obj.data)
      }
    }
  
    throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
  }
  
  function checked (length) {
    // Note: cannot use `length < kMaxLength()` here because that fails when
    // length is NaN (which is otherwise coerced to zero.)
    if (length >= kMaxLength()) {
      throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                           'size: 0x' + kMaxLength().toString(16) + ' bytes')
    }
    return length | 0
  }
  
  function SlowBuffer (length) {
    if (+length != length) { // eslint-disable-line eqeqeq
      length = 0
    }
    return Buffer.alloc(+length)
  }
  
  Buffer.isBuffer = function isBuffer (b) {
    return !!(b != null && b._isBuffer)
  }
  
  Buffer.compare = function compare (a, b) {
    if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
      throw new TypeError('Arguments must be Buffers')
    }
  
    if (a === b) return 0
  
    var x = a.length
    var y = b.length
  
    for (var i = 0, len = Math.min(x, y); i < len; ++i) {
      if (a[i] !== b[i]) {
        x = a[i]
        y = b[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  Buffer.isEncoding = function isEncoding (encoding) {
    switch (String(encoding).toLowerCase()) {
      case 'hex':
      case 'utf8':
      case 'utf-8':
      case 'ascii':
      case 'latin1':
      case 'binary':
      case 'base64':
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return true
      default:
        return false
    }
  }
  
  Buffer.concat = function concat (list, length) {
    if (!isArray(list)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
  
    if (list.length === 0) {
      return Buffer.alloc(0)
    }
  
    var i
    if (length === undefined) {
      length = 0
      for (i = 0; i < list.length; ++i) {
        length += list[i].length
      }
    }
  
    var buffer = Buffer.allocUnsafe(length)
    var pos = 0
    for (i = 0; i < list.length; ++i) {
      var buf = list[i]
      if (!Buffer.isBuffer(buf)) {
        throw new TypeError('"list" argument must be an Array of Buffers')
      }
      buf.copy(buffer, pos)
      pos += buf.length
    }
    return buffer
  }
  
  function byteLength (string, encoding) {
    if (Buffer.isBuffer(string)) {
      return string.length
    }
    if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
        (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
      return string.byteLength
    }
    if (typeof string !== 'string') {
      string = '' + string
    }
  
    var len = string.length
    if (len === 0) return 0
  
    // Use a for loop to avoid recursion
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'ascii':
        case 'latin1':
        case 'binary':
          return len
        case 'utf8':
        case 'utf-8':
        case undefined:
          return utf8ToBytes(string).length
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return len * 2
        case 'hex':
          return len >>> 1
        case 'base64':
          return base64ToBytes(string).length
        default:
          if (loweredCase) return utf8ToBytes(string).length // assume utf8
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  Buffer.byteLength = byteLength
  
  function slowToString (encoding, start, end) {
    var loweredCase = false
  
    // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
    // property of a typed array.
  
    // This behaves neither like String nor Uint8Array in that we set start/end
    // to their upper/lower bounds if the value passed is out of range.
    // undefined is handled specially as per ECMA-262 6th Edition,
    // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
    if (start === undefined || start < 0) {
      start = 0
    }
    // Return early if start > this.length. Done here to prevent potential uint32
    // coercion fail below.
    if (start > this.length) {
      return ''
    }
  
    if (end === undefined || end > this.length) {
      end = this.length
    }
  
    if (end <= 0) {
      return ''
    }
  
    // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
    end >>>= 0
    start >>>= 0
  
    if (end <= start) {
      return ''
    }
  
    if (!encoding) encoding = 'utf8'
  
    while (true) {
      switch (encoding) {
        case 'hex':
          return hexSlice(this, start, end)
  
        case 'utf8':
        case 'utf-8':
          return utf8Slice(this, start, end)
  
        case 'ascii':
          return asciiSlice(this, start, end)
  
        case 'latin1':
        case 'binary':
          return latin1Slice(this, start, end)
  
        case 'base64':
          return base64Slice(this, start, end)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return utf16leSlice(this, start, end)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = (encoding + '').toLowerCase()
          loweredCase = true
      }
    }
  }
  
  // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
  // Buffer instances.
  Buffer.prototype._isBuffer = true
  
  function swap (b, n, m) {
    var i = b[n]
    b[n] = b[m]
    b[m] = i
  }
  
  Buffer.prototype.swap16 = function swap16 () {
    var len = this.length
    if (len % 2 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 16-bits')
    }
    for (var i = 0; i < len; i += 2) {
      swap(this, i, i + 1)
    }
    return this
  }
  
  Buffer.prototype.swap32 = function swap32 () {
    var len = this.length
    if (len % 4 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 32-bits')
    }
    for (var i = 0; i < len; i += 4) {
      swap(this, i, i + 3)
      swap(this, i + 1, i + 2)
    }
    return this
  }
  
  Buffer.prototype.swap64 = function swap64 () {
    var len = this.length
    if (len % 8 !== 0) {
      throw new RangeError('Buffer size must be a multiple of 64-bits')
    }
    for (var i = 0; i < len; i += 8) {
      swap(this, i, i + 7)
      swap(this, i + 1, i + 6)
      swap(this, i + 2, i + 5)
      swap(this, i + 3, i + 4)
    }
    return this
  }
  
  Buffer.prototype.toString = function toString () {
    var length = this.length | 0
    if (length === 0) return ''
    if (arguments.length === 0) return utf8Slice(this, 0, length)
    return slowToString.apply(this, arguments)
  }
  
  Buffer.prototype.equals = function equals (b) {
    if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
    if (this === b) return true
    return Buffer.compare(this, b) === 0
  }
  
  Buffer.prototype.inspect = function inspect () {
    var str = ''
    var max = exports.INSPECT_MAX_BYTES
    if (this.length > 0) {
      str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
      if (this.length > max) str += ' ... '
    }
    return '<Buffer ' + str + '>'
  }
  
  Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
    if (!Buffer.isBuffer(target)) {
      throw new TypeError('Argument must be a Buffer')
    }
  
    if (start === undefined) {
      start = 0
    }
    if (end === undefined) {
      end = target ? target.length : 0
    }
    if (thisStart === undefined) {
      thisStart = 0
    }
    if (thisEnd === undefined) {
      thisEnd = this.length
    }
  
    if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
      throw new RangeError('out of range index')
    }
  
    if (thisStart >= thisEnd && start >= end) {
      return 0
    }
    if (thisStart >= thisEnd) {
      return -1
    }
    if (start >= end) {
      return 1
    }
  
    start >>>= 0
    end >>>= 0
    thisStart >>>= 0
    thisEnd >>>= 0
  
    if (this === target) return 0
  
    var x = thisEnd - thisStart
    var y = end - start
    var len = Math.min(x, y)
  
    var thisCopy = this.slice(thisStart, thisEnd)
    var targetCopy = target.slice(start, end)
  
    for (var i = 0; i < len; ++i) {
      if (thisCopy[i] !== targetCopy[i]) {
        x = thisCopy[i]
        y = targetCopy[i]
        break
      }
    }
  
    if (x < y) return -1
    if (y < x) return 1
    return 0
  }
  
  // Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
  // OR the last index of `val` in `buffer` at offset <= `byteOffset`.
  //
  // Arguments:
  // - buffer - a Buffer to search
  // - val - a string, Buffer, or number
  // - byteOffset - an index into `buffer`; will be clamped to an int32
  // - encoding - an optional encoding, relevant is val is a string
  // - dir - true for indexOf, false for lastIndexOf
  function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
    // Empty buffer means no match
    if (buffer.length === 0) return -1
  
    // Normalize byteOffset
    if (typeof byteOffset === 'string') {
      encoding = byteOffset
      byteOffset = 0
    } else if (byteOffset > 0x7fffffff) {
      byteOffset = 0x7fffffff
    } else if (byteOffset < -0x80000000) {
      byteOffset = -0x80000000
    }
    byteOffset = +byteOffset  // Coerce to Number.
    if (isNaN(byteOffset)) {
      // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
      byteOffset = dir ? 0 : (buffer.length - 1)
    }
  
    // Normalize byteOffset: negative offsets start from the end of the buffer
    if (byteOffset < 0) byteOffset = buffer.length + byteOffset
    if (byteOffset >= buffer.length) {
      if (dir) return -1
      else byteOffset = buffer.length - 1
    } else if (byteOffset < 0) {
      if (dir) byteOffset = 0
      else return -1
    }
  
    // Normalize val
    if (typeof val === 'string') {
      val = Buffer.from(val, encoding)
    }
  
    // Finally, search either indexOf (if dir is true) or lastIndexOf
    if (Buffer.isBuffer(val)) {
      // Special case: looking for empty string/buffer always fails
      if (val.length === 0) {
        return -1
      }
      return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
    } else if (typeof val === 'number') {
      val = val & 0xFF // Search for a byte value [0-255]
      if (Buffer.TYPED_ARRAY_SUPPORT &&
          typeof Uint8Array.prototype.indexOf === 'function') {
        if (dir) {
          return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
        } else {
          return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
        }
      }
      return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
    }
  
    throw new TypeError('val must be string, number or Buffer')
  }
  
  function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
    var indexSize = 1
    var arrLength = arr.length
    var valLength = val.length
  
    if (encoding !== undefined) {
      encoding = String(encoding).toLowerCase()
      if (encoding === 'ucs2' || encoding === 'ucs-2' ||
          encoding === 'utf16le' || encoding === 'utf-16le') {
        if (arr.length < 2 || val.length < 2) {
          return -1
        }
        indexSize = 2
        arrLength /= 2
        valLength /= 2
        byteOffset /= 2
      }
    }
  
    function read (buf, i) {
      if (indexSize === 1) {
        return buf[i]
      } else {
        return buf.readUInt16BE(i * indexSize)
      }
    }
  
    var i
    if (dir) {
      var foundIndex = -1
      for (i = byteOffset; i < arrLength; i++) {
        if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
          if (foundIndex === -1) foundIndex = i
          if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
        } else {
          if (foundIndex !== -1) i -= i - foundIndex
          foundIndex = -1
        }
      }
    } else {
      if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
      for (i = byteOffset; i >= 0; i--) {
        var found = true
        for (var j = 0; j < valLength; j++) {
          if (read(arr, i + j) !== read(val, j)) {
            found = false
            break
          }
        }
        if (found) return i
      }
    }
  
    return -1
  }
  
  Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
    return this.indexOf(val, byteOffset, encoding) !== -1
  }
  
  Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
  }
  
  Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
    return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
  }
  
  function hexWrite (buf, string, offset, length) {
    offset = Number(offset) || 0
    var remaining = buf.length - offset
    if (!length) {
      length = remaining
    } else {
      length = Number(length)
      if (length > remaining) {
        length = remaining
      }
    }
  
    // must be an even number of digits
    var strLen = string.length
    if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')
  
    if (length > strLen / 2) {
      length = strLen / 2
    }
    for (var i = 0; i < length; ++i) {
      var parsed = parseInt(string.substr(i * 2, 2), 16)
      if (isNaN(parsed)) return i
      buf[offset + i] = parsed
    }
    return i
  }
  
  function utf8Write (buf, string, offset, length) {
    return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  function asciiWrite (buf, string, offset, length) {
    return blitBuffer(asciiToBytes(string), buf, offset, length)
  }
  
  function latin1Write (buf, string, offset, length) {
    return asciiWrite(buf, string, offset, length)
  }
  
  function base64Write (buf, string, offset, length) {
    return blitBuffer(base64ToBytes(string), buf, offset, length)
  }
  
  function ucs2Write (buf, string, offset, length) {
    return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
  }
  
  Buffer.prototype.write = function write (string, offset, length, encoding) {
    // Buffer#write(string)
    if (offset === undefined) {
      encoding = 'utf8'
      length = this.length
      offset = 0
    // Buffer#write(string, encoding)
    } else if (length === undefined && typeof offset === 'string') {
      encoding = offset
      length = this.length
      offset = 0
    // Buffer#write(string, offset[, length][, encoding])
    } else if (isFinite(offset)) {
      offset = offset | 0
      if (isFinite(length)) {
        length = length | 0
        if (encoding === undefined) encoding = 'utf8'
      } else {
        encoding = length
        length = undefined
      }
    // legacy write(string, encoding, offset, length) - remove in v0.13
    } else {
      throw new Error(
        'Buffer.write(string, encoding, offset[, length]) is no longer supported'
      )
    }
  
    var remaining = this.length - offset
    if (length === undefined || length > remaining) length = remaining
  
    if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
      throw new RangeError('Attempt to write outside buffer bounds')
    }
  
    if (!encoding) encoding = 'utf8'
  
    var loweredCase = false
    for (;;) {
      switch (encoding) {
        case 'hex':
          return hexWrite(this, string, offset, length)
  
        case 'utf8':
        case 'utf-8':
          return utf8Write(this, string, offset, length)
  
        case 'ascii':
          return asciiWrite(this, string, offset, length)
  
        case 'latin1':
        case 'binary':
          return latin1Write(this, string, offset, length)
  
        case 'base64':
          // Warning: maxLength not taken into account in base64Write
          return base64Write(this, string, offset, length)
  
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return ucs2Write(this, string, offset, length)
  
        default:
          if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
          encoding = ('' + encoding).toLowerCase()
          loweredCase = true
      }
    }
  }
  
  Buffer.prototype.toJSON = function toJSON () {
    return {
      type: 'Buffer',
      data: Array.prototype.slice.call(this._arr || this, 0)
    }
  }
  
  function base64Slice (buf, start, end) {
    if (start === 0 && end === buf.length) {
      return base64.fromByteArray(buf)
    } else {
      return base64.fromByteArray(buf.slice(start, end))
    }
  }
  
  function utf8Slice (buf, start, end) {
    end = Math.min(buf.length, end)
    var res = []
  
    var i = start
    while (i < end) {
      var firstByte = buf[i]
      var codePoint = null
      var bytesPerSequence = (firstByte > 0xEF) ? 4
        : (firstByte > 0xDF) ? 3
        : (firstByte > 0xBF) ? 2
        : 1
  
      if (i + bytesPerSequence <= end) {
        var secondByte, thirdByte, fourthByte, tempCodePoint
  
        switch (bytesPerSequence) {
          case 1:
            if (firstByte < 0x80) {
              codePoint = firstByte
            }
            break
          case 2:
            secondByte = buf[i + 1]
            if ((secondByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
              if (tempCodePoint > 0x7F) {
                codePoint = tempCodePoint
              }
            }
            break
          case 3:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
              if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                codePoint = tempCodePoint
              }
            }
            break
          case 4:
            secondByte = buf[i + 1]
            thirdByte = buf[i + 2]
            fourthByte = buf[i + 3]
            if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
              tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
              if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                codePoint = tempCodePoint
              }
            }
        }
      }
  
      if (codePoint === null) {
        // we did not generate a valid codePoint so insert a
        // replacement char (U+FFFD) and advance only 1 byte
        codePoint = 0xFFFD
        bytesPerSequence = 1
      } else if (codePoint > 0xFFFF) {
        // encode to utf16 (surrogate pair dance)
        codePoint -= 0x10000
        res.push(codePoint >>> 10 & 0x3FF | 0xD800)
        codePoint = 0xDC00 | codePoint & 0x3FF
      }
  
      res.push(codePoint)
      i += bytesPerSequence
    }
  
    return decodeCodePointsArray(res)
  }
  
  // Based on http://stackoverflow.com/a/22747272/680742, the browser with
  // the lowest limit is Chrome, with 0x10000 args.
  // We go 1 magnitude less, for safety
  var MAX_ARGUMENTS_LENGTH = 0x1000
  
  function decodeCodePointsArray (codePoints) {
    var len = codePoints.length
    if (len <= MAX_ARGUMENTS_LENGTH) {
      return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
    }
  
    // Decode in chunks to avoid "call stack size exceeded".
    var res = ''
    var i = 0
    while (i < len) {
      res += String.fromCharCode.apply(
        String,
        codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
      )
    }
    return res
  }
  
  function asciiSlice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i] & 0x7F)
    }
    return ret
  }
  
  function latin1Slice (buf, start, end) {
    var ret = ''
    end = Math.min(buf.length, end)
  
    for (var i = start; i < end; ++i) {
      ret += String.fromCharCode(buf[i])
    }
    return ret
  }
  
  function hexSlice (buf, start, end) {
    var len = buf.length
  
    if (!start || start < 0) start = 0
    if (!end || end < 0 || end > len) end = len
  
    var out = ''
    for (var i = start; i < end; ++i) {
      out += toHex(buf[i])
    }
    return out
  }
  
  function utf16leSlice (buf, start, end) {
    var bytes = buf.slice(start, end)
    var res = ''
    for (var i = 0; i < bytes.length; i += 2) {
      res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
    }
    return res
  }
  
  Buffer.prototype.slice = function slice (start, end) {
    var len = this.length
    start = ~~start
    end = end === undefined ? len : ~~end
  
    if (start < 0) {
      start += len
      if (start < 0) start = 0
    } else if (start > len) {
      start = len
    }
  
    if (end < 0) {
      end += len
      if (end < 0) end = 0
    } else if (end > len) {
      end = len
    }
  
    if (end < start) end = start
  
    var newBuf
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      newBuf = this.subarray(start, end)
      newBuf.__proto__ = Buffer.prototype
    } else {
      var sliceLen = end - start
      newBuf = new Buffer(sliceLen, undefined)
      for (var i = 0; i < sliceLen; ++i) {
        newBuf[i] = this[i + start]
      }
    }
  
    return newBuf
  }
  
  /*
   * Need to make sure that buffer isn't trying to write out of bounds.
   */
  function checkOffset (offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
  }
  
  Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      checkOffset(offset, byteLength, this.length)
    }
  
    var val = this[offset + --byteLength]
    var mul = 1
    while (byteLength > 0 && (mul *= 0x100)) {
      val += this[offset + --byteLength] * mul
    }
  
    return val
  }
  
  Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 1, this.length)
    return this[offset]
  }
  
  Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    return this[offset] | (this[offset + 1] << 8)
  }
  
  Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    return (this[offset] << 8) | this[offset + 1]
  }
  
  Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return ((this[offset]) |
        (this[offset + 1] << 8) |
        (this[offset + 2] << 16)) +
        (this[offset + 3] * 0x1000000)
  }
  
  Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] * 0x1000000) +
      ((this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      this[offset + 3])
  }
  
  Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var val = this[offset]
    var mul = 1
    var i = 0
    while (++i < byteLength && (mul *= 0x100)) {
      val += this[offset + i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) checkOffset(offset, byteLength, this.length)
  
    var i = byteLength
    var mul = 1
    var val = this[offset + --i]
    while (i > 0 && (mul *= 0x100)) {
      val += this[offset + --i] * mul
    }
    mul *= 0x80
  
    if (val >= mul) val -= Math.pow(2, 8 * byteLength)
  
    return val
  }
  
  Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 1, this.length)
    if (!(this[offset] & 0x80)) return (this[offset])
    return ((0xff - this[offset] + 1) * -1)
  }
  
  Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset] | (this[offset + 1] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 2, this.length)
    var val = this[offset + 1] | (this[offset] << 8)
    return (val & 0x8000) ? val | 0xFFFF0000 : val
  }
  
  Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16) |
      (this[offset + 3] << 24)
  }
  
  Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
  
    return (this[offset] << 24) |
      (this[offset + 1] << 16) |
      (this[offset + 2] << 8) |
      (this[offset + 3])
  }
  
  Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, true, 23, 4)
  }
  
  Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 4, this.length)
    return ieee754.read(this, offset, false, 23, 4)
  }
  
  Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, true, 52, 8)
  }
  
  Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
    if (!noAssert) checkOffset(offset, 8, this.length)
    return ieee754.read(this, offset, false, 52, 8)
  }
  
  function checkInt (buf, value, offset, ext, max, min) {
    if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
    if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
  }
  
  Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var mul = 1
    var i = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    byteLength = byteLength | 0
    if (!noAssert) {
      var maxBytes = Math.pow(2, 8 * byteLength) - 1
      checkInt(this, value, offset, byteLength, maxBytes, 0)
    }
  
    var i = byteLength - 1
    var mul = 1
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      this[offset + i] = (value / mul) & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
    if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  function objectWriteUInt16 (buf, value, offset, littleEndian) {
    if (value < 0) value = 0xffff + value + 1
    for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {
      buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
        (littleEndian ? i : 1 - i) * 8
    }
  }
  
  Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
    } else {
      objectWriteUInt16(this, value, offset, true)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 8)
      this[offset + 1] = (value & 0xff)
    } else {
      objectWriteUInt16(this, value, offset, false)
    }
    return offset + 2
  }
  
  function objectWriteUInt32 (buf, value, offset, littleEndian) {
    if (value < 0) value = 0xffffffff + value + 1
    for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {
      buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
    }
  }
  
  Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset + 3] = (value >>> 24)
      this[offset + 2] = (value >>> 16)
      this[offset + 1] = (value >>> 8)
      this[offset] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, true)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 24)
      this[offset + 1] = (value >>> 16)
      this[offset + 2] = (value >>> 8)
      this[offset + 3] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, false)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) {
      var limit = Math.pow(2, 8 * byteLength - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = 0
    var mul = 1
    var sub = 0
    this[offset] = value & 0xFF
    while (++i < byteLength && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) {
      var limit = Math.pow(2, 8 * byteLength - 1)
  
      checkInt(this, value, offset, byteLength, limit - 1, -limit)
    }
  
    var i = byteLength - 1
    var mul = 1
    var sub = 0
    this[offset + i] = value & 0xFF
    while (--i >= 0 && (mul *= 0x100)) {
      if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
        sub = 1
      }
      this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
    }
  
    return offset + byteLength
  }
  
  Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
    if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
    if (value < 0) value = 0xff + value + 1
    this[offset] = (value & 0xff)
    return offset + 1
  }
  
  Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
    } else {
      objectWriteUInt16(this, value, offset, true)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 8)
      this[offset + 1] = (value & 0xff)
    } else {
      objectWriteUInt16(this, value, offset, false)
    }
    return offset + 2
  }
  
  Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value & 0xff)
      this[offset + 1] = (value >>> 8)
      this[offset + 2] = (value >>> 16)
      this[offset + 3] = (value >>> 24)
    } else {
      objectWriteUInt32(this, value, offset, true)
    }
    return offset + 4
  }
  
  Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
    value = +value
    offset = offset | 0
    if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
    if (value < 0) value = 0xffffffff + value + 1
    if (Buffer.TYPED_ARRAY_SUPPORT) {
      this[offset] = (value >>> 24)
      this[offset + 1] = (value >>> 16)
      this[offset + 2] = (value >>> 8)
      this[offset + 3] = (value & 0xff)
    } else {
      objectWriteUInt32(this, value, offset, false)
    }
    return offset + 4
  }
  
  function checkIEEE754 (buf, value, offset, ext, max, min) {
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
    if (offset < 0) throw new RangeError('Index out of range')
  }
  
  function writeFloat (buf, value, offset, littleEndian, noAssert) {
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
    }
    ieee754.write(buf, value, offset, littleEndian, 23, 4)
    return offset + 4
  }
  
  Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
    return writeFloat(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
    return writeFloat(this, value, offset, false, noAssert)
  }
  
  function writeDouble (buf, value, offset, littleEndian, noAssert) {
    if (!noAssert) {
      checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
    }
    ieee754.write(buf, value, offset, littleEndian, 52, 8)
    return offset + 8
  }
  
  Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
    return writeDouble(this, value, offset, true, noAssert)
  }
  
  Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
    return writeDouble(this, value, offset, false, noAssert)
  }
  
  // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
  Buffer.prototype.copy = function copy (target, targetStart, start, end) {
    if (!start) start = 0
    if (!end && end !== 0) end = this.length
    if (targetStart >= target.length) targetStart = target.length
    if (!targetStart) targetStart = 0
    if (end > 0 && end < start) end = start
  
    // Copy 0 bytes; we're done
    if (end === start) return 0
    if (target.length === 0 || this.length === 0) return 0
  
    // Fatal error conditions
    if (targetStart < 0) {
      throw new RangeError('targetStart out of bounds')
    }
    if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
    if (end < 0) throw new RangeError('sourceEnd out of bounds')
  
    // Are we oob?
    if (end > this.length) end = this.length
    if (target.length - targetStart < end - start) {
      end = target.length - targetStart + start
    }
  
    var len = end - start
    var i
  
    if (this === target && start < targetStart && targetStart < end) {
      // descending copy from end
      for (i = len - 1; i >= 0; --i) {
        target[i + targetStart] = this[i + start]
      }
    } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
      // ascending copy from start
      for (i = 0; i < len; ++i) {
        target[i + targetStart] = this[i + start]
      }
    } else {
      Uint8Array.prototype.set.call(
        target,
        this.subarray(start, start + len),
        targetStart
      )
    }
  
    return len
  }
  
  // Usage:
  //    buffer.fill(number[, offset[, end]])
  //    buffer.fill(buffer[, offset[, end]])
  //    buffer.fill(string[, offset[, end]][, encoding])
  Buffer.prototype.fill = function fill (val, start, end, encoding) {
    // Handle string cases:
    if (typeof val === 'string') {
      if (typeof start === 'string') {
        encoding = start
        start = 0
        end = this.length
      } else if (typeof end === 'string') {
        encoding = end
        end = this.length
      }
      if (val.length === 1) {
        var code = val.charCodeAt(0)
        if (code < 256) {
          val = code
        }
      }
      if (encoding !== undefined && typeof encoding !== 'string') {
        throw new TypeError('encoding must be a string')
      }
      if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
        throw new TypeError('Unknown encoding: ' + encoding)
      }
    } else if (typeof val === 'number') {
      val = val & 255
    }
  
    // Invalid ranges are not set to a default, so can range check early.
    if (start < 0 || this.length < start || this.length < end) {
      throw new RangeError('Out of range index')
    }
  
    if (end <= start) {
      return this
    }
  
    start = start >>> 0
    end = end === undefined ? this.length : end >>> 0
  
    if (!val) val = 0
  
    var i
    if (typeof val === 'number') {
      for (i = start; i < end; ++i) {
        this[i] = val
      }
    } else {
      var bytes = Buffer.isBuffer(val)
        ? val
        : utf8ToBytes(new Buffer(val, encoding).toString())
      var len = bytes.length
      for (i = 0; i < end - start; ++i) {
        this[i + start] = bytes[i % len]
      }
    }
  
    return this
  }
  
  // HELPER FUNCTIONS
  // ================
  
  var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g
  
  function base64clean (str) {
    // Node strips out invalid characters like \n and \t from the string, base64-js does not
    str = stringtrim(str).replace(INVALID_BASE64_RE, '')
    // Node converts strings with length < 2 to ''
    if (str.length < 2) return ''
    // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
    while (str.length % 4 !== 0) {
      str = str + '='
    }
    return str
  }
  
  function stringtrim (str) {
    if (str.trim) return str.trim()
    return str.replace(/^\s+|\s+$/g, '')
  }
  
  function toHex (n) {
    if (n < 16) return '0' + n.toString(16)
    return n.toString(16)
  }
  
  function utf8ToBytes (string, units) {
    units = units || Infinity
    var codePoint
    var length = string.length
    var leadSurrogate = null
    var bytes = []
  
    for (var i = 0; i < length; ++i) {
      codePoint = string.charCodeAt(i)
  
      // is surrogate component
      if (codePoint > 0xD7FF && codePoint < 0xE000) {
        // last char was a lead
        if (!leadSurrogate) {
          // no lead yet
          if (codePoint > 0xDBFF) {
            // unexpected trail
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          } else if (i + 1 === length) {
            // unpaired lead
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
            continue
          }
  
          // valid lead
          leadSurrogate = codePoint
  
          continue
        }
  
        // 2 leads in a row
        if (codePoint < 0xDC00) {
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          leadSurrogate = codePoint
          continue
        }
  
        // valid surrogate pair
        codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
      } else if (leadSurrogate) {
        // valid bmp char, but last char was a lead
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
      }
  
      leadSurrogate = null
  
      // encode utf8
      if (codePoint < 0x80) {
        if ((units -= 1) < 0) break
        bytes.push(codePoint)
      } else if (codePoint < 0x800) {
        if ((units -= 2) < 0) break
        bytes.push(
          codePoint >> 0x6 | 0xC0,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x10000) {
        if ((units -= 3) < 0) break
        bytes.push(
          codePoint >> 0xC | 0xE0,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else if (codePoint < 0x110000) {
        if ((units -= 4) < 0) break
        bytes.push(
          codePoint >> 0x12 | 0xF0,
          codePoint >> 0xC & 0x3F | 0x80,
          codePoint >> 0x6 & 0x3F | 0x80,
          codePoint & 0x3F | 0x80
        )
      } else {
        throw new Error('Invalid code point')
      }
    }
  
    return bytes
  }
  
  function asciiToBytes (str) {
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      // Node's code seems to be doing this and not & 0x7F..
      byteArray.push(str.charCodeAt(i) & 0xFF)
    }
    return byteArray
  }
  
  function utf16leToBytes (str, units) {
    var c, hi, lo
    var byteArray = []
    for (var i = 0; i < str.length; ++i) {
      if ((units -= 2) < 0) break
  
      c = str.charCodeAt(i)
      hi = c >> 8
      lo = c % 256
      byteArray.push(lo)
      byteArray.push(hi)
    }
  
    return byteArray
  }
  
  function base64ToBytes (str) {
    return base64.toByteArray(base64clean(str))
  }
  
  function blitBuffer (src, dst, offset, length) {
    for (var i = 0; i < length; ++i) {
      if ((i + offset >= dst.length) || (i >= src.length)) break
      dst[i + offset] = src[i]
    }
    return i
  }
  
  function isnan (val) {
    return val !== val // eslint-disable-line no-self-compare
  }
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"base64-js":2,"ieee754":9,"isarray":12}],5:[function(require,module,exports){
  module.exports = {
    "100": "Continue",
    "101": "Switching Protocols",
    "102": "Processing",
    "200": "OK",
    "201": "Created",
    "202": "Accepted",
    "203": "Non-Authoritative Information",
    "204": "No Content",
    "205": "Reset Content",
    "206": "Partial Content",
    "207": "Multi-Status",
    "208": "Already Reported",
    "226": "IM Used",
    "300": "Multiple Choices",
    "301": "Moved Permanently",
    "302": "Found",
    "303": "See Other",
    "304": "Not Modified",
    "305": "Use Proxy",
    "307": "Temporary Redirect",
    "308": "Permanent Redirect",
    "400": "Bad Request",
    "401": "Unauthorized",
    "402": "Payment Required",
    "403": "Forbidden",
    "404": "Not Found",
    "405": "Method Not Allowed",
    "406": "Not Acceptable",
    "407": "Proxy Authentication Required",
    "408": "Request Timeout",
    "409": "Conflict",
    "410": "Gone",
    "411": "Length Required",
    "412": "Precondition Failed",
    "413": "Payload Too Large",
    "414": "URI Too Long",
    "415": "Unsupported Media Type",
    "416": "Range Not Satisfiable",
    "417": "Expectation Failed",
    "418": "I'm a teapot",
    "421": "Misdirected Request",
    "422": "Unprocessable Entity",
    "423": "Locked",
    "424": "Failed Dependency",
    "425": "Unordered Collection",
    "426": "Upgrade Required",
    "428": "Precondition Required",
    "429": "Too Many Requests",
    "431": "Request Header Fields Too Large",
    "451": "Unavailable For Legal Reasons",
    "500": "Internal Server Error",
    "501": "Not Implemented",
    "502": "Bad Gateway",
    "503": "Service Unavailable",
    "504": "Gateway Timeout",
    "505": "HTTP Version Not Supported",
    "506": "Variant Also Negotiates",
    "507": "Insufficient Storage",
    "508": "Loop Detected",
    "509": "Bandwidth Limit Exceeded",
    "510": "Not Extended",
    "511": "Network Authentication Required"
  }
  
  },{}],6:[function(require,module,exports){
  (function (Buffer){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // NOTE: These type checking functions intentionally don't use `instanceof`
  // because it is fragile and can be easily faked with `Object.create()`.
  
  function isArray(arg) {
    if (Array.isArray) {
      return Array.isArray(arg);
    }
    return objectToString(arg) === '[object Array]';
  }
  exports.isArray = isArray;
  
  function isBoolean(arg) {
    return typeof arg === 'boolean';
  }
  exports.isBoolean = isBoolean;
  
  function isNull(arg) {
    return arg === null;
  }
  exports.isNull = isNull;
  
  function isNullOrUndefined(arg) {
    return arg == null;
  }
  exports.isNullOrUndefined = isNullOrUndefined;
  
  function isNumber(arg) {
    return typeof arg === 'number';
  }
  exports.isNumber = isNumber;
  
  function isString(arg) {
    return typeof arg === 'string';
  }
  exports.isString = isString;
  
  function isSymbol(arg) {
    return typeof arg === 'symbol';
  }
  exports.isSymbol = isSymbol;
  
  function isUndefined(arg) {
    return arg === void 0;
  }
  exports.isUndefined = isUndefined;
  
  function isRegExp(re) {
    return objectToString(re) === '[object RegExp]';
  }
  exports.isRegExp = isRegExp;
  
  function isObject(arg) {
    return typeof arg === 'object' && arg !== null;
  }
  exports.isObject = isObject;
  
  function isDate(d) {
    return objectToString(d) === '[object Date]';
  }
  exports.isDate = isDate;
  
  function isError(e) {
    return (objectToString(e) === '[object Error]' || e instanceof Error);
  }
  exports.isError = isError;
  
  function isFunction(arg) {
    return typeof arg === 'function';
  }
  exports.isFunction = isFunction;
  
  function isPrimitive(arg) {
    return arg === null ||
           typeof arg === 'boolean' ||
           typeof arg === 'number' ||
           typeof arg === 'string' ||
           typeof arg === 'symbol' ||  // ES6 symbol
           typeof arg === 'undefined';
  }
  exports.isPrimitive = isPrimitive;
  
  exports.isBuffer = Buffer.isBuffer;
  
  function objectToString(o) {
    return Object.prototype.toString.call(o);
  }
  
  }).call(this,{"isBuffer":require("../../is-buffer/index.js")})
  },{"../../is-buffer/index.js":11}],7:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  function EventEmitter() {
    this._events = this._events || {};
    this._maxListeners = this._maxListeners || undefined;
  }
  module.exports = EventEmitter;
  
  // Backwards-compat with node 0.10.x
  EventEmitter.EventEmitter = EventEmitter;
  
  EventEmitter.prototype._events = undefined;
  EventEmitter.prototype._maxListeners = undefined;
  
  // By default EventEmitters will print a warning if more than 10 listeners are
  // added to it. This is a useful default which helps finding memory leaks.
  EventEmitter.defaultMaxListeners = 10;
  
  // Obviously not all Emitters should be limited to 10. This function allows
  // that to be increased. Set to zero for unlimited.
  EventEmitter.prototype.setMaxListeners = function(n) {
    if (!isNumber(n) || n < 0 || isNaN(n))
      throw TypeError('n must be a positive number');
    this._maxListeners = n;
    return this;
  };
  
  EventEmitter.prototype.emit = function(type) {
    var er, handler, len, args, i, listeners;
  
    if (!this._events)
      this._events = {};
  
    // If there is no 'error' event listener then throw.
    if (type === 'error') {
      if (!this._events.error ||
          (isObject(this._events.error) && !this._events.error.length)) {
        er = arguments[1];
        if (er instanceof Error) {
          throw er; // Unhandled 'error' event
        } else {
          // At least give some kind of context to the user
          var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
          err.context = er;
          throw err;
        }
      }
    }
  
    handler = this._events[type];
  
    if (isUndefined(handler))
      return false;
  
    if (isFunction(handler)) {
      switch (arguments.length) {
        // fast cases
        case 1:
          handler.call(this);
          break;
        case 2:
          handler.call(this, arguments[1]);
          break;
        case 3:
          handler.call(this, arguments[1], arguments[2]);
          break;
        // slower
        default:
          args = Array.prototype.slice.call(arguments, 1);
          handler.apply(this, args);
      }
    } else if (isObject(handler)) {
      args = Array.prototype.slice.call(arguments, 1);
      listeners = handler.slice();
      len = listeners.length;
      for (i = 0; i < len; i++)
        listeners[i].apply(this, args);
    }
  
    return true;
  };
  
  EventEmitter.prototype.addListener = function(type, listener) {
    var m;
  
    if (!isFunction(listener))
      throw TypeError('listener must be a function');
  
    if (!this._events)
      this._events = {};
  
    // To avoid recursion in the case that type === "newListener"! Before
    // adding it to the listeners, first emit "newListener".
    if (this._events.newListener)
      this.emit('newListener', type,
                isFunction(listener.listener) ?
                listener.listener : listener);
  
    if (!this._events[type])
      // Optimize the case of one listener. Don't need the extra array object.
      this._events[type] = listener;
    else if (isObject(this._events[type]))
      // If we've already got an array, just append.
      this._events[type].push(listener);
    else
      // Adding the second element, need to change to array.
      this._events[type] = [this._events[type], listener];
  
    // Check for listener leak
    if (isObject(this._events[type]) && !this._events[type].warned) {
      if (!isUndefined(this._maxListeners)) {
        m = this._maxListeners;
      } else {
        m = EventEmitter.defaultMaxListeners;
      }
  
      if (m && m > 0 && this._events[type].length > m) {
        this._events[type].warned = true;
        console.error('(node) warning: possible EventEmitter memory ' +
                      'leak detected. %d listeners added. ' +
                      'Use emitter.setMaxListeners() to increase limit.',
                      this._events[type].length);
        if (typeof console.trace === 'function') {
          // not supported in IE 10
          console.trace();
        }
      }
    }
  
    return this;
  };
  
  EventEmitter.prototype.on = EventEmitter.prototype.addListener;
  
  EventEmitter.prototype.once = function(type, listener) {
    if (!isFunction(listener))
      throw TypeError('listener must be a function');
  
    var fired = false;
  
    function g() {
      this.removeListener(type, g);
  
      if (!fired) {
        fired = true;
        listener.apply(this, arguments);
      }
    }
  
    g.listener = listener;
    this.on(type, g);
  
    return this;
  };
  
  // emits a 'removeListener' event iff the listener was removed
  EventEmitter.prototype.removeListener = function(type, listener) {
    var list, position, length, i;
  
    if (!isFunction(listener))
      throw TypeError('listener must be a function');
  
    if (!this._events || !this._events[type])
      return this;
  
    list = this._events[type];
    length = list.length;
    position = -1;
  
    if (list === listener ||
        (isFunction(list.listener) && list.listener === listener)) {
      delete this._events[type];
      if (this._events.removeListener)
        this.emit('removeListener', type, listener);
  
    } else if (isObject(list)) {
      for (i = length; i-- > 0;) {
        if (list[i] === listener ||
            (list[i].listener && list[i].listener === listener)) {
          position = i;
          break;
        }
      }
  
      if (position < 0)
        return this;
  
      if (list.length === 1) {
        list.length = 0;
        delete this._events[type];
      } else {
        list.splice(position, 1);
      }
  
      if (this._events.removeListener)
        this.emit('removeListener', type, listener);
    }
  
    return this;
  };
  
  EventEmitter.prototype.removeAllListeners = function(type) {
    var key, listeners;
  
    if (!this._events)
      return this;
  
    // not listening for removeListener, no need to emit
    if (!this._events.removeListener) {
      if (arguments.length === 0)
        this._events = {};
      else if (this._events[type])
        delete this._events[type];
      return this;
    }
  
    // emit removeListener for all listeners on all events
    if (arguments.length === 0) {
      for (key in this._events) {
        if (key === 'removeListener') continue;
        this.removeAllListeners(key);
      }
      this.removeAllListeners('removeListener');
      this._events = {};
      return this;
    }
  
    listeners = this._events[type];
  
    if (isFunction(listeners)) {
      this.removeListener(type, listeners);
    } else if (listeners) {
      // LIFO order
      while (listeners.length)
        this.removeListener(type, listeners[listeners.length - 1]);
    }
    delete this._events[type];
  
    return this;
  };
  
  EventEmitter.prototype.listeners = function(type) {
    var ret;
    if (!this._events || !this._events[type])
      ret = [];
    else if (isFunction(this._events[type]))
      ret = [this._events[type]];
    else
      ret = this._events[type].slice();
    return ret;
  };
  
  EventEmitter.prototype.listenerCount = function(type) {
    if (this._events) {
      var evlistener = this._events[type];
  
      if (isFunction(evlistener))
        return 1;
      else if (evlistener)
        return evlistener.length;
    }
    return 0;
  };
  
  EventEmitter.listenerCount = function(emitter, type) {
    return emitter.listenerCount(type);
  };
  
  function isFunction(arg) {
    return typeof arg === 'function';
  }
  
  function isNumber(arg) {
    return typeof arg === 'number';
  }
  
  function isObject(arg) {
    return typeof arg === 'object' && arg !== null;
  }
  
  function isUndefined(arg) {
    return arg === void 0;
  }
  
  },{}],8:[function(require,module,exports){
  var http = require('http');
  
  var https = module.exports;
  
  for (var key in http) {
      if (http.hasOwnProperty(key)) https[key] = http[key];
  };
  
  https.request = function (params, cb) {
      if (!params) params = {};
      params.scheme = 'https';
      params.protocol = 'https:';
      return http.request.call(this, params, cb);
  }
  
  },{"http":30}],9:[function(require,module,exports){
  exports.read = function (buffer, offset, isLE, mLen, nBytes) {
    var e, m
    var eLen = nBytes * 8 - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var nBits = -7
    var i = isLE ? (nBytes - 1) : 0
    var d = isLE ? -1 : 1
    var s = buffer[offset + i]
  
    i += d
  
    e = s & ((1 << (-nBits)) - 1)
    s >>= (-nBits)
    nBits += eLen
    for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
  
    m = e & ((1 << (-nBits)) - 1)
    e >>= (-nBits)
    nBits += mLen
    for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
  
    if (e === 0) {
      e = 1 - eBias
    } else if (e === eMax) {
      return m ? NaN : ((s ? -1 : 1) * Infinity)
    } else {
      m = m + Math.pow(2, mLen)
      e = e - eBias
    }
    return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
  }
  
  exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
    var e, m, c
    var eLen = nBytes * 8 - mLen - 1
    var eMax = (1 << eLen) - 1
    var eBias = eMax >> 1
    var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
    var i = isLE ? 0 : (nBytes - 1)
    var d = isLE ? 1 : -1
    var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
  
    value = Math.abs(value)
  
    if (isNaN(value) || value === Infinity) {
      m = isNaN(value) ? 1 : 0
      e = eMax
    } else {
      e = Math.floor(Math.log(value) / Math.LN2)
      if (value * (c = Math.pow(2, -e)) < 1) {
        e--
        c *= 2
      }
      if (e + eBias >= 1) {
        value += rt / c
      } else {
        value += rt * Math.pow(2, 1 - eBias)
      }
      if (value * c >= 2) {
        e++
        c /= 2
      }
  
      if (e + eBias >= eMax) {
        m = 0
        e = eMax
      } else if (e + eBias >= 1) {
        m = (value * c - 1) * Math.pow(2, mLen)
        e = e + eBias
      } else {
        m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
        e = 0
      }
    }
  
    for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
  
    e = (e << mLen) | m
    eLen += mLen
    for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
  
    buffer[offset + i - d] |= s * 128
  }
  
  },{}],10:[function(require,module,exports){
  if (typeof Object.create === 'function') {
    // implementation from standard node.js 'util' module
    module.exports = function inherits(ctor, superCtor) {
      ctor.super_ = superCtor
      ctor.prototype = Object.create(superCtor.prototype, {
        constructor: {
          value: ctor,
          enumerable: false,
          writable: true,
          configurable: true
        }
      });
    };
  } else {
    // old school shim for old browsers
    module.exports = function inherits(ctor, superCtor) {
      ctor.super_ = superCtor
      var TempCtor = function () {}
      TempCtor.prototype = superCtor.prototype
      ctor.prototype = new TempCtor()
      ctor.prototype.constructor = ctor
    }
  }
  
  },{}],11:[function(require,module,exports){
  /*!
   * Determine if an object is a Buffer
   *
   * @author   Feross Aboukhadijeh <https://feross.org>
   * @license  MIT
   */
  
  // The _isBuffer check is for Safari 5-7 support, because it's missing
  // Object.prototype.constructor. Remove this eventually
  module.exports = function (obj) {
    return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
  }
  
  function isBuffer (obj) {
    return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
  }
  
  // For Node v0.10 support. Remove this eventually.
  function isSlowBuffer (obj) {
    return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
  }
  
  },{}],12:[function(require,module,exports){
  var toString = {}.toString;
  
  module.exports = Array.isArray || function (arr) {
    return toString.call(arr) == '[object Array]';
  };
  
  },{}],13:[function(require,module,exports){
  (function (process){
  'use strict';
  
  if (!process.version ||
      process.version.indexOf('v0.') === 0 ||
      process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
    module.exports = { nextTick: nextTick };
  } else {
    module.exports = process
  }
  
  function nextTick(fn, arg1, arg2, arg3) {
    if (typeof fn !== 'function') {
      throw new TypeError('"callback" argument must be a function');
    }
    var len = arguments.length;
    var args, i;
    switch (len) {
    case 0:
    case 1:
      return process.nextTick(fn);
    case 2:
      return process.nextTick(function afterTickOne() {
        fn.call(null, arg1);
      });
    case 3:
      return process.nextTick(function afterTickTwo() {
        fn.call(null, arg1, arg2);
      });
    case 4:
      return process.nextTick(function afterTickThree() {
        fn.call(null, arg1, arg2, arg3);
      });
    default:
      args = new Array(len - 1);
      i = 0;
      while (i < args.length) {
        args[i++] = arguments[i];
      }
      return process.nextTick(function afterTick() {
        fn.apply(null, args);
      });
    }
  }
  
  
  }).call(this,require('_process'))
  },{"_process":14}],14:[function(require,module,exports){
  // shim for using process in browser
  var process = module.exports = {};
  
  // cached from whatever global is present so that test runners that stub it
  // don't break things.  But we need to wrap it in a try catch in case it is
  // wrapped in strict mode code which doesn't define any globals.  It's inside a
  // function because try/catches deoptimize in certain engines.
  
  var cachedSetTimeout;
  var cachedClearTimeout;
  
  function defaultSetTimout() {
      throw new Error('setTimeout has not been defined');
  }
  function defaultClearTimeout () {
      throw new Error('clearTimeout has not been defined');
  }
  (function () {
      try {
          if (typeof setTimeout === 'function') {
              cachedSetTimeout = setTimeout;
          } else {
              cachedSetTimeout = defaultSetTimout;
          }
      } catch (e) {
          cachedSetTimeout = defaultSetTimout;
      }
      try {
          if (typeof clearTimeout === 'function') {
              cachedClearTimeout = clearTimeout;
          } else {
              cachedClearTimeout = defaultClearTimeout;
          }
      } catch (e) {
          cachedClearTimeout = defaultClearTimeout;
      }
  } ())
  function runTimeout(fun) {
      if (cachedSetTimeout === setTimeout) {
          //normal enviroments in sane situations
          return setTimeout(fun, 0);
      }
      // if setTimeout wasn't available but was latter defined
      if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
          cachedSetTimeout = setTimeout;
          return setTimeout(fun, 0);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedSetTimeout(fun, 0);
      } catch(e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
              return cachedSetTimeout.call(null, fun, 0);
          } catch(e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
              return cachedSetTimeout.call(this, fun, 0);
          }
      }
  
  
  }
  function runClearTimeout(marker) {
      if (cachedClearTimeout === clearTimeout) {
          //normal enviroments in sane situations
          return clearTimeout(marker);
      }
      // if clearTimeout wasn't available but was latter defined
      if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
          cachedClearTimeout = clearTimeout;
          return clearTimeout(marker);
      }
      try {
          // when when somebody has screwed with setTimeout but no I.E. maddness
          return cachedClearTimeout(marker);
      } catch (e){
          try {
              // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
              return cachedClearTimeout.call(null, marker);
          } catch (e){
              // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
              // Some versions of I.E. have different rules for clearTimeout vs setTimeout
              return cachedClearTimeout.call(this, marker);
          }
      }
  
  
  
  }
  var queue = [];
  var draining = false;
  var currentQueue;
  var queueIndex = -1;
  
  function cleanUpNextTick() {
      if (!draining || !currentQueue) {
          return;
      }
      draining = false;
      if (currentQueue.length) {
          queue = currentQueue.concat(queue);
      } else {
          queueIndex = -1;
      }
      if (queue.length) {
          drainQueue();
      }
  }
  
  function drainQueue() {
      if (draining) {
          return;
      }
      var timeout = runTimeout(cleanUpNextTick);
      draining = true;
  
      var len = queue.length;
      while(len) {
          currentQueue = queue;
          queue = [];
          while (++queueIndex < len) {
              if (currentQueue) {
                  currentQueue[queueIndex].run();
              }
          }
          queueIndex = -1;
          len = queue.length;
      }
      currentQueue = null;
      draining = false;
      runClearTimeout(timeout);
  }
  
  process.nextTick = function (fun) {
      var args = new Array(arguments.length - 1);
      if (arguments.length > 1) {
          for (var i = 1; i < arguments.length; i++) {
              args[i - 1] = arguments[i];
          }
      }
      queue.push(new Item(fun, args));
      if (queue.length === 1 && !draining) {
          runTimeout(drainQueue);
      }
  };
  
  // v8 likes predictible objects
  function Item(fun, array) {
      this.fun = fun;
      this.array = array;
  }
  Item.prototype.run = function () {
      this.fun.apply(null, this.array);
  };
  process.title = 'browser';
  process.browser = true;
  process.env = {};
  process.argv = [];
  process.version = ''; // empty string to avoid regexp issues
  process.versions = {};
  
  function noop() {}
  
  process.on = noop;
  process.addListener = noop;
  process.once = noop;
  process.off = noop;
  process.removeListener = noop;
  process.removeAllListeners = noop;
  process.emit = noop;
  process.prependListener = noop;
  process.prependOnceListener = noop;
  
  process.listeners = function (name) { return [] }
  
  process.binding = function (name) {
      throw new Error('process.binding is not supported');
  };
  
  process.cwd = function () { return '/' };
  process.chdir = function (dir) {
      throw new Error('process.chdir is not supported');
  };
  process.umask = function() { return 0; };
  
  },{}],15:[function(require,module,exports){
  (function (global){
  /*! https://mths.be/punycode v1.4.1 by @mathias */
  ;(function(root) {
  
  	/** Detect free variables */
  	var freeExports = typeof exports == 'object' && exports &&
  		!exports.nodeType && exports;
  	var freeModule = typeof module == 'object' && module &&
  		!module.nodeType && module;
  	var freeGlobal = typeof global == 'object' && global;
  	if (
  		freeGlobal.global === freeGlobal ||
  		freeGlobal.window === freeGlobal ||
  		freeGlobal.self === freeGlobal
  	) {
  		root = freeGlobal;
  	}
  
  	/**
  	 * The `punycode` object.
  	 * @name punycode
  	 * @type Object
  	 */
  	var punycode,
  
  	/** Highest positive signed 32-bit float value */
  	maxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1
  
  	/** Bootstring parameters */
  	base = 36,
  	tMin = 1,
  	tMax = 26,
  	skew = 38,
  	damp = 700,
  	initialBias = 72,
  	initialN = 128, // 0x80
  	delimiter = '-', // '\x2D'
  
  	/** Regular expressions */
  	regexPunycode = /^xn--/,
  	regexNonASCII = /[^\x20-\x7E]/, // unprintable ASCII chars + non-ASCII chars
  	regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g, // RFC 3490 separators
  
  	/** Error messages */
  	errors = {
  		'overflow': 'Overflow: input needs wider integers to process',
  		'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
  		'invalid-input': 'Invalid input'
  	},
  
  	/** Convenience shortcuts */
  	baseMinusTMin = base - tMin,
  	floor = Math.floor,
  	stringFromCharCode = String.fromCharCode,
  
  	/** Temporary variable */
  	key;
  
  	/*--------------------------------------------------------------------------*/
  
  	/**
  	 * A generic error utility function.
  	 * @private
  	 * @param {String} type The error type.
  	 * @returns {Error} Throws a `RangeError` with the applicable error message.
  	 */
  	function error(type) {
  		throw new RangeError(errors[type]);
  	}
  
  	/**
  	 * A generic `Array#map` utility function.
  	 * @private
  	 * @param {Array} array The array to iterate over.
  	 * @param {Function} callback The function that gets called for every array
  	 * item.
  	 * @returns {Array} A new array of values returned by the callback function.
  	 */
  	function map(array, fn) {
  		var length = array.length;
  		var result = [];
  		while (length--) {
  			result[length] = fn(array[length]);
  		}
  		return result;
  	}
  
  	/**
  	 * A simple `Array#map`-like wrapper to work with domain name strings or email
  	 * addresses.
  	 * @private
  	 * @param {String} domain The domain name or email address.
  	 * @param {Function} callback The function that gets called for every
  	 * character.
  	 * @returns {Array} A new string of characters returned by the callback
  	 * function.
  	 */
  	function mapDomain(string, fn) {
  		var parts = string.split('@');
  		var result = '';
  		if (parts.length > 1) {
  			// In email addresses, only the domain name should be punycoded. Leave
  			// the local part (i.e. everything up to `@`) intact.
  			result = parts[0] + '@';
  			string = parts[1];
  		}
  		// Avoid `split(regex)` for IE8 compatibility. See #17.
  		string = string.replace(regexSeparators, '\x2E');
  		var labels = string.split('.');
  		var encoded = map(labels, fn).join('.');
  		return result + encoded;
  	}
  
  	/**
  	 * Creates an array containing the numeric code points of each Unicode
  	 * character in the string. While JavaScript uses UCS-2 internally,
  	 * this function will convert a pair of surrogate halves (each of which
  	 * UCS-2 exposes as separate characters) into a single code point,
  	 * matching UTF-16.
  	 * @see `punycode.ucs2.encode`
  	 * @see <https://mathiasbynens.be/notes/javascript-encoding>
  	 * @memberOf punycode.ucs2
  	 * @name decode
  	 * @param {String} string The Unicode input string (UCS-2).
  	 * @returns {Array} The new array of code points.
  	 */
  	function ucs2decode(string) {
  		var output = [],
  		    counter = 0,
  		    length = string.length,
  		    value,
  		    extra;
  		while (counter < length) {
  			value = string.charCodeAt(counter++);
  			if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
  				// high surrogate, and there is a next character
  				extra = string.charCodeAt(counter++);
  				if ((extra & 0xFC00) == 0xDC00) { // low surrogate
  					output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
  				} else {
  					// unmatched surrogate; only append this code unit, in case the next
  					// code unit is the high surrogate of a surrogate pair
  					output.push(value);
  					counter--;
  				}
  			} else {
  				output.push(value);
  			}
  		}
  		return output;
  	}
  
  	/**
  	 * Creates a string based on an array of numeric code points.
  	 * @see `punycode.ucs2.decode`
  	 * @memberOf punycode.ucs2
  	 * @name encode
  	 * @param {Array} codePoints The array of numeric code points.
  	 * @returns {String} The new Unicode string (UCS-2).
  	 */
  	function ucs2encode(array) {
  		return map(array, function(value) {
  			var output = '';
  			if (value > 0xFFFF) {
  				value -= 0x10000;
  				output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
  				value = 0xDC00 | value & 0x3FF;
  			}
  			output += stringFromCharCode(value);
  			return output;
  		}).join('');
  	}
  
  	/**
  	 * Converts a basic code point into a digit/integer.
  	 * @see `digitToBasic()`
  	 * @private
  	 * @param {Number} codePoint The basic numeric code point value.
  	 * @returns {Number} The numeric value of a basic code point (for use in
  	 * representing integers) in the range `0` to `base - 1`, or `base` if
  	 * the code point does not represent a value.
  	 */
  	function basicToDigit(codePoint) {
  		if (codePoint - 48 < 10) {
  			return codePoint - 22;
  		}
  		if (codePoint - 65 < 26) {
  			return codePoint - 65;
  		}
  		if (codePoint - 97 < 26) {
  			return codePoint - 97;
  		}
  		return base;
  	}
  
  	/**
  	 * Converts a digit/integer into a basic code point.
  	 * @see `basicToDigit()`
  	 * @private
  	 * @param {Number} digit The numeric value of a basic code point.
  	 * @returns {Number} The basic code point whose value (when used for
  	 * representing integers) is `digit`, which needs to be in the range
  	 * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
  	 * used; else, the lowercase form is used. The behavior is undefined
  	 * if `flag` is non-zero and `digit` has no uppercase form.
  	 */
  	function digitToBasic(digit, flag) {
  		//  0..25 map to ASCII a..z or A..Z
  		// 26..35 map to ASCII 0..9
  		return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
  	}
  
  	/**
  	 * Bias adaptation function as per section 3.4 of RFC 3492.
  	 * https://tools.ietf.org/html/rfc3492#section-3.4
  	 * @private
  	 */
  	function adapt(delta, numPoints, firstTime) {
  		var k = 0;
  		delta = firstTime ? floor(delta / damp) : delta >> 1;
  		delta += floor(delta / numPoints);
  		for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
  			delta = floor(delta / baseMinusTMin);
  		}
  		return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
  	}
  
  	/**
  	 * Converts a Punycode string of ASCII-only symbols to a string of Unicode
  	 * symbols.
  	 * @memberOf punycode
  	 * @param {String} input The Punycode string of ASCII-only symbols.
  	 * @returns {String} The resulting string of Unicode symbols.
  	 */
  	function decode(input) {
  		// Don't use UCS-2
  		var output = [],
  		    inputLength = input.length,
  		    out,
  		    i = 0,
  		    n = initialN,
  		    bias = initialBias,
  		    basic,
  		    j,
  		    index,
  		    oldi,
  		    w,
  		    k,
  		    digit,
  		    t,
  		    /** Cached calculation results */
  		    baseMinusT;
  
  		// Handle the basic code points: let `basic` be the number of input code
  		// points before the last delimiter, or `0` if there is none, then copy
  		// the first basic code points to the output.
  
  		basic = input.lastIndexOf(delimiter);
  		if (basic < 0) {
  			basic = 0;
  		}
  
  		for (j = 0; j < basic; ++j) {
  			// if it's not a basic code point
  			if (input.charCodeAt(j) >= 0x80) {
  				error('not-basic');
  			}
  			output.push(input.charCodeAt(j));
  		}
  
  		// Main decoding loop: start just after the last delimiter if any basic code
  		// points were copied; start at the beginning otherwise.
  
  		for (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {
  
  			// `index` is the index of the next character to be consumed.
  			// Decode a generalized variable-length integer into `delta`,
  			// which gets added to `i`. The overflow checking is easier
  			// if we increase `i` as we go, then subtract off its starting
  			// value at the end to obtain `delta`.
  			for (oldi = i, w = 1, k = base; /* no condition */; k += base) {
  
  				if (index >= inputLength) {
  					error('invalid-input');
  				}
  
  				digit = basicToDigit(input.charCodeAt(index++));
  
  				if (digit >= base || digit > floor((maxInt - i) / w)) {
  					error('overflow');
  				}
  
  				i += digit * w;
  				t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
  
  				if (digit < t) {
  					break;
  				}
  
  				baseMinusT = base - t;
  				if (w > floor(maxInt / baseMinusT)) {
  					error('overflow');
  				}
  
  				w *= baseMinusT;
  
  			}
  
  			out = output.length + 1;
  			bias = adapt(i - oldi, out, oldi == 0);
  
  			// `i` was supposed to wrap around from `out` to `0`,
  			// incrementing `n` each time, so we'll fix that now:
  			if (floor(i / out) > maxInt - n) {
  				error('overflow');
  			}
  
  			n += floor(i / out);
  			i %= out;
  
  			// Insert `n` at position `i` of the output
  			output.splice(i++, 0, n);
  
  		}
  
  		return ucs2encode(output);
  	}
  
  	/**
  	 * Converts a string of Unicode symbols (e.g. a domain name label) to a
  	 * Punycode string of ASCII-only symbols.
  	 * @memberOf punycode
  	 * @param {String} input The string of Unicode symbols.
  	 * @returns {String} The resulting Punycode string of ASCII-only symbols.
  	 */
  	function encode(input) {
  		var n,
  		    delta,
  		    handledCPCount,
  		    basicLength,
  		    bias,
  		    j,
  		    m,
  		    q,
  		    k,
  		    t,
  		    currentValue,
  		    output = [],
  		    /** `inputLength` will hold the number of code points in `input`. */
  		    inputLength,
  		    /** Cached calculation results */
  		    handledCPCountPlusOne,
  		    baseMinusT,
  		    qMinusT;
  
  		// Convert the input in UCS-2 to Unicode
  		input = ucs2decode(input);
  
  		// Cache the length
  		inputLength = input.length;
  
  		// Initialize the state
  		n = initialN;
  		delta = 0;
  		bias = initialBias;
  
  		// Handle the basic code points
  		for (j = 0; j < inputLength; ++j) {
  			currentValue = input[j];
  			if (currentValue < 0x80) {
  				output.push(stringFromCharCode(currentValue));
  			}
  		}
  
  		handledCPCount = basicLength = output.length;
  
  		// `handledCPCount` is the number of code points that have been handled;
  		// `basicLength` is the number of basic code points.
  
  		// Finish the basic string - if it is not empty - with a delimiter
  		if (basicLength) {
  			output.push(delimiter);
  		}
  
  		// Main encoding loop:
  		while (handledCPCount < inputLength) {
  
  			// All non-basic code points < n have been handled already. Find the next
  			// larger one:
  			for (m = maxInt, j = 0; j < inputLength; ++j) {
  				currentValue = input[j];
  				if (currentValue >= n && currentValue < m) {
  					m = currentValue;
  				}
  			}
  
  			// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
  			// but guard against overflow
  			handledCPCountPlusOne = handledCPCount + 1;
  			if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
  				error('overflow');
  			}
  
  			delta += (m - n) * handledCPCountPlusOne;
  			n = m;
  
  			for (j = 0; j < inputLength; ++j) {
  				currentValue = input[j];
  
  				if (currentValue < n && ++delta > maxInt) {
  					error('overflow');
  				}
  
  				if (currentValue == n) {
  					// Represent delta as a generalized variable-length integer
  					for (q = delta, k = base; /* no condition */; k += base) {
  						t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
  						if (q < t) {
  							break;
  						}
  						qMinusT = q - t;
  						baseMinusT = base - t;
  						output.push(
  							stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
  						);
  						q = floor(qMinusT / baseMinusT);
  					}
  
  					output.push(stringFromCharCode(digitToBasic(q, 0)));
  					bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
  					delta = 0;
  					++handledCPCount;
  				}
  			}
  
  			++delta;
  			++n;
  
  		}
  		return output.join('');
  	}
  
  	/**
  	 * Converts a Punycode string representing a domain name or an email address
  	 * to Unicode. Only the Punycoded parts of the input will be converted, i.e.
  	 * it doesn't matter if you call it on a string that has already been
  	 * converted to Unicode.
  	 * @memberOf punycode
  	 * @param {String} input The Punycoded domain name or email address to
  	 * convert to Unicode.
  	 * @returns {String} The Unicode representation of the given Punycode
  	 * string.
  	 */
  	function toUnicode(input) {
  		return mapDomain(input, function(string) {
  			return regexPunycode.test(string)
  				? decode(string.slice(4).toLowerCase())
  				: string;
  		});
  	}
  
  	/**
  	 * Converts a Unicode string representing a domain name or an email address to
  	 * Punycode. Only the non-ASCII parts of the domain name will be converted,
  	 * i.e. it doesn't matter if you call it with a domain that's already in
  	 * ASCII.
  	 * @memberOf punycode
  	 * @param {String} input The domain name or email address to convert, as a
  	 * Unicode string.
  	 * @returns {String} The Punycode representation of the given domain name or
  	 * email address.
  	 */
  	function toASCII(input) {
  		return mapDomain(input, function(string) {
  			return regexNonASCII.test(string)
  				? 'xn--' + encode(string)
  				: string;
  		});
  	}
  
  	/*--------------------------------------------------------------------------*/
  
  	/** Define the public API */
  	punycode = {
  		/**
  		 * A string representing the current Punycode.js version number.
  		 * @memberOf punycode
  		 * @type String
  		 */
  		'version': '1.4.1',
  		/**
  		 * An object of methods to convert from JavaScript's internal character
  		 * representation (UCS-2) to Unicode code points, and back.
  		 * @see <https://mathiasbynens.be/notes/javascript-encoding>
  		 * @memberOf punycode
  		 * @type Object
  		 */
  		'ucs2': {
  			'decode': ucs2decode,
  			'encode': ucs2encode
  		},
  		'decode': decode,
  		'encode': encode,
  		'toASCII': toASCII,
  		'toUnicode': toUnicode
  	};
  
  	/** Expose `punycode` */
  	// Some AMD build optimizers, like r.js, check for specific condition patterns
  	// like the following:
  	if (
  		typeof define == 'function' &&
  		typeof define.amd == 'object' &&
  		define.amd
  	) {
  		define('punycode', function() {
  			return punycode;
  		});
  	} else if (freeExports && freeModule) {
  		if (module.exports == freeExports) {
  			// in Node.js, io.js, or RingoJS v0.8.0+
  			freeModule.exports = punycode;
  		} else {
  			// in Narwhal or RingoJS v0.7.0-
  			for (key in punycode) {
  				punycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);
  			}
  		}
  	} else {
  		// in Rhino or a web browser
  		root.punycode = punycode;
  	}
  
  }(this));
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],16:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  
  // If obj.hasOwnProperty has been overridden, then calling
  // obj.hasOwnProperty(prop) will break.
  // See: https://github.com/joyent/node/issues/1707
  function hasOwnProperty(obj, prop) {
    return Object.prototype.hasOwnProperty.call(obj, prop);
  }
  
  module.exports = function(qs, sep, eq, options) {
    sep = sep || '&';
    eq = eq || '=';
    var obj = {};
  
    if (typeof qs !== 'string' || qs.length === 0) {
      return obj;
    }
  
    var regexp = /\+/g;
    qs = qs.split(sep);
  
    var maxKeys = 1000;
    if (options && typeof options.maxKeys === 'number') {
      maxKeys = options.maxKeys;
    }
  
    var len = qs.length;
    // maxKeys <= 0 means that we should not limit keys count
    if (maxKeys > 0 && len > maxKeys) {
      len = maxKeys;
    }
  
    for (var i = 0; i < len; ++i) {
      var x = qs[i].replace(regexp, '%20'),
          idx = x.indexOf(eq),
          kstr, vstr, k, v;
  
      if (idx >= 0) {
        kstr = x.substr(0, idx);
        vstr = x.substr(idx + 1);
      } else {
        kstr = x;
        vstr = '';
      }
  
      k = decodeURIComponent(kstr);
      v = decodeURIComponent(vstr);
  
      if (!hasOwnProperty(obj, k)) {
        obj[k] = v;
      } else if (isArray(obj[k])) {
        obj[k].push(v);
      } else {
        obj[k] = [obj[k], v];
      }
    }
  
    return obj;
  };
  
  var isArray = Array.isArray || function (xs) {
    return Object.prototype.toString.call(xs) === '[object Array]';
  };
  
  },{}],17:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  
  var stringifyPrimitive = function(v) {
    switch (typeof v) {
      case 'string':
        return v;
  
      case 'boolean':
        return v ? 'true' : 'false';
  
      case 'number':
        return isFinite(v) ? v : '';
  
      default:
        return '';
    }
  };
  
  module.exports = function(obj, sep, eq, name) {
    sep = sep || '&';
    eq = eq || '=';
    if (obj === null) {
      obj = undefined;
    }
  
    if (typeof obj === 'object') {
      return map(objectKeys(obj), function(k) {
        var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;
        if (isArray(obj[k])) {
          return map(obj[k], function(v) {
            return ks + encodeURIComponent(stringifyPrimitive(v));
          }).join(sep);
        } else {
          return ks + encodeURIComponent(stringifyPrimitive(obj[k]));
        }
      }).join(sep);
  
    }
  
    if (!name) return '';
    return encodeURIComponent(stringifyPrimitive(name)) + eq +
           encodeURIComponent(stringifyPrimitive(obj));
  };
  
  var isArray = Array.isArray || function (xs) {
    return Object.prototype.toString.call(xs) === '[object Array]';
  };
  
  function map (xs, f) {
    if (xs.map) return xs.map(f);
    var res = [];
    for (var i = 0; i < xs.length; i++) {
      res.push(f(xs[i], i));
    }
    return res;
  }
  
  var objectKeys = Object.keys || function (obj) {
    var res = [];
    for (var key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key)) res.push(key);
    }
    return res;
  };
  
  },{}],18:[function(require,module,exports){
  'use strict';
  
  exports.decode = exports.parse = require('./decode');
  exports.encode = exports.stringify = require('./encode');
  
  },{"./decode":16,"./encode":17}],19:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // a duplex stream is just a stream that is both readable and writable.
  // Since JS doesn't have multiple prototypal inheritance, this class
  // prototypally inherits from Readable, and then parasitically from
  // Writable.
  
  'use strict';
  
  /*<replacement>*/
  
  var processNextTick = require('process-nextick-args').nextTick;
  /*</replacement>*/
  
  /*<replacement>*/
  var objectKeys = Object.keys || function (obj) {
    var keys = [];
    for (var key in obj) {
      keys.push(key);
    }return keys;
  };
  /*</replacement>*/
  
  module.exports = Duplex;
  
  /*<replacement>*/
  var util = require('core-util-is');
  util.inherits = require('inherits');
  /*</replacement>*/
  
  var Readable = require('./_stream_readable');
  var Writable = require('./_stream_writable');
  
  util.inherits(Duplex, Readable);
  
  var keys = objectKeys(Writable.prototype);
  for (var v = 0; v < keys.length; v++) {
    var method = keys[v];
    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
  }
  
  function Duplex(options) {
    if (!(this instanceof Duplex)) return new Duplex(options);
  
    Readable.call(this, options);
    Writable.call(this, options);
  
    if (options && options.readable === false) this.readable = false;
  
    if (options && options.writable === false) this.writable = false;
  
    this.allowHalfOpen = true;
    if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
  
    this.once('end', onend);
  }
  
  // the no-half-open enforcer
  function onend() {
    // if we allow half-open state, or if the writable side ended,
    // then we're ok.
    if (this.allowHalfOpen || this._writableState.ended) return;
  
    // no more data can be written.
    // But allow more writes to happen in this tick.
    processNextTick(onEndNT, this);
  }
  
  function onEndNT(self) {
    self.end();
  }
  
  Object.defineProperty(Duplex.prototype, 'destroyed', {
    get: function () {
      if (this._readableState === undefined || this._writableState === undefined) {
        return false;
      }
      return this._readableState.destroyed && this._writableState.destroyed;
    },
    set: function (value) {
      // we ignore the value if the stream
      // has not been initialized yet
      if (this._readableState === undefined || this._writableState === undefined) {
        return;
      }
  
      // backward compatibility, the user is explicitly
      // managing destroyed
      this._readableState.destroyed = value;
      this._writableState.destroyed = value;
    }
  });
  
  Duplex.prototype._destroy = function (err, cb) {
    this.push(null);
    this.end();
  
    processNextTick(cb, err);
  };
  
  function forEach(xs, f) {
    for (var i = 0, l = xs.length; i < l; i++) {
      f(xs[i], i);
    }
  }
  },{"./_stream_readable":21,"./_stream_writable":23,"core-util-is":6,"inherits":10,"process-nextick-args":13}],20:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // a passthrough stream.
  // basically just the most minimal sort of Transform stream.
  // Every written chunk gets output as-is.
  
  'use strict';
  
  module.exports = PassThrough;
  
  var Transform = require('./_stream_transform');
  
  /*<replacement>*/
  var util = require('core-util-is');
  util.inherits = require('inherits');
  /*</replacement>*/
  
  util.inherits(PassThrough, Transform);
  
  function PassThrough(options) {
    if (!(this instanceof PassThrough)) return new PassThrough(options);
  
    Transform.call(this, options);
  }
  
  PassThrough.prototype._transform = function (chunk, encoding, cb) {
    cb(null, chunk);
  };
  },{"./_stream_transform":22,"core-util-is":6,"inherits":10}],21:[function(require,module,exports){
  (function (process,global){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  
  /*<replacement>*/
  
  var processNextTick = require('process-nextick-args').nextTick;
  /*</replacement>*/
  
  module.exports = Readable;
  
  /*<replacement>*/
  var isArray = require('isarray');
  /*</replacement>*/
  
  /*<replacement>*/
  var Duplex;
  /*</replacement>*/
  
  Readable.ReadableState = ReadableState;
  
  /*<replacement>*/
  var EE = require('events').EventEmitter;
  
  var EElistenerCount = function (emitter, type) {
    return emitter.listeners(type).length;
  };
  /*</replacement>*/
  
  /*<replacement>*/
  var Stream = require('./internal/streams/stream');
  /*</replacement>*/
  
  /*<replacement>*/
  
  var Buffer = require('safe-buffer').Buffer;
  var OurUint8Array = global.Uint8Array || function () {};
  function _uint8ArrayToBuffer(chunk) {
    return Buffer.from(chunk);
  }
  function _isUint8Array(obj) {
    return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
  }
  
  /*</replacement>*/
  
  /*<replacement>*/
  var util = require('core-util-is');
  util.inherits = require('inherits');
  /*</replacement>*/
  
  /*<replacement>*/
  var debugUtil = require('util');
  var debug = void 0;
  if (debugUtil && debugUtil.debuglog) {
    debug = debugUtil.debuglog('stream');
  } else {
    debug = function () {};
  }
  /*</replacement>*/
  
  var BufferList = require('./internal/streams/BufferList');
  var destroyImpl = require('./internal/streams/destroy');
  var StringDecoder;
  
  util.inherits(Readable, Stream);
  
  var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];
  
  function prependListener(emitter, event, fn) {
    // Sadly this is not cacheable as some libraries bundle their own
    // event emitter implementation with them.
    if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);
  
    // This is a hack to make sure that our error handler is attached before any
    // userland ones.  NEVER DO THIS. This is here only because this code needs
    // to continue to work with older versions of Node.js that do not include
    // the prependListener() method. The goal is to eventually remove this hack.
    if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
  }
  
  function ReadableState(options, stream) {
    Duplex = Duplex || require('./_stream_duplex');
  
    options = options || {};
  
    // Duplex streams are both readable and writable, but share
    // the same options object.
    // However, some cases require setting options to different
    // values for the readable and the writable sides of the duplex stream.
    // These options can be provided separately as readableXXX and writableXXX.
    var isDuplex = stream instanceof Duplex;
  
    // object stream flag. Used to make read(n) ignore n and to
    // make all the buffer merging and length checks go away
    this.objectMode = !!options.objectMode;
  
    if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
  
    // the point at which it stops calling _read() to fill the buffer
    // Note: 0 is a valid value, means "don't call _read preemptively ever"
    var hwm = options.highWaterMark;
    var readableHwm = options.readableHighWaterMark;
    var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  
    if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm;
  
    // cast to ints.
    this.highWaterMark = Math.floor(this.highWaterMark);
  
    // A linked list is used to store data chunks instead of an array because the
    // linked list can remove elements from the beginning faster than
    // array.shift()
    this.buffer = new BufferList();
    this.length = 0;
    this.pipes = null;
    this.pipesCount = 0;
    this.flowing = null;
    this.ended = false;
    this.endEmitted = false;
    this.reading = false;
  
    // a flag to be able to tell if the event 'readable'/'data' is emitted
    // immediately, or on a later tick.  We set this to true at first, because
    // any actions that shouldn't happen until "later" should generally also
    // not happen before the first read call.
    this.sync = true;
  
    // whenever we return null, then we set a flag to say
    // that we're awaiting a 'readable' event emission.
    this.needReadable = false;
    this.emittedReadable = false;
    this.readableListening = false;
    this.resumeScheduled = false;
  
    // has it been destroyed
    this.destroyed = false;
  
    // Crypto is kind of old and crusty.  Historically, its default string
    // encoding is 'binary' so we have to make this configurable.
    // Everything else in the universe uses 'utf8', though.
    this.defaultEncoding = options.defaultEncoding || 'utf8';
  
    // the number of writers that are awaiting a drain event in .pipe()s
    this.awaitDrain = 0;
  
    // if true, a maybeReadMore has been scheduled
    this.readingMore = false;
  
    this.decoder = null;
    this.encoding = null;
    if (options.encoding) {
      if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
      this.decoder = new StringDecoder(options.encoding);
      this.encoding = options.encoding;
    }
  }
  
  function Readable(options) {
    Duplex = Duplex || require('./_stream_duplex');
  
    if (!(this instanceof Readable)) return new Readable(options);
  
    this._readableState = new ReadableState(options, this);
  
    // legacy
    this.readable = true;
  
    if (options) {
      if (typeof options.read === 'function') this._read = options.read;
  
      if (typeof options.destroy === 'function') this._destroy = options.destroy;
    }
  
    Stream.call(this);
  }
  
  Object.defineProperty(Readable.prototype, 'destroyed', {
    get: function () {
      if (this._readableState === undefined) {
        return false;
      }
      return this._readableState.destroyed;
    },
    set: function (value) {
      // we ignore the value if the stream
      // has not been initialized yet
      if (!this._readableState) {
        return;
      }
  
      // backward compatibility, the user is explicitly
      // managing destroyed
      this._readableState.destroyed = value;
    }
  });
  
  Readable.prototype.destroy = destroyImpl.destroy;
  Readable.prototype._undestroy = destroyImpl.undestroy;
  Readable.prototype._destroy = function (err, cb) {
    this.push(null);
    cb(err);
  };
  
  // Manually shove something into the read() buffer.
  // This returns true if the highWaterMark has not been hit yet,
  // similar to how Writable.write() returns true if you should
  // write() some more.
  Readable.prototype.push = function (chunk, encoding) {
    var state = this._readableState;
    var skipChunkCheck;
  
    if (!state.objectMode) {
      if (typeof chunk === 'string') {
        encoding = encoding || state.defaultEncoding;
        if (encoding !== state.encoding) {
          chunk = Buffer.from(chunk, encoding);
          encoding = '';
        }
        skipChunkCheck = true;
      }
    } else {
      skipChunkCheck = true;
    }
  
    return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
  };
  
  // Unshift should *always* be something directly out of read()
  Readable.prototype.unshift = function (chunk) {
    return readableAddChunk(this, chunk, null, true, false);
  };
  
  function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
    var state = stream._readableState;
    if (chunk === null) {
      state.reading = false;
      onEofChunk(stream, state);
    } else {
      var er;
      if (!skipChunkCheck) er = chunkInvalid(state, chunk);
      if (er) {
        stream.emit('error', er);
      } else if (state.objectMode || chunk && chunk.length > 0) {
        if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
          chunk = _uint8ArrayToBuffer(chunk);
        }
  
        if (addToFront) {
          if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
        } else if (state.ended) {
          stream.emit('error', new Error('stream.push() after EOF'));
        } else {
          state.reading = false;
          if (state.decoder && !encoding) {
            chunk = state.decoder.write(chunk);
            if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
          } else {
            addChunk(stream, state, chunk, false);
          }
        }
      } else if (!addToFront) {
        state.reading = false;
      }
    }
  
    return needMoreData(state);
  }
  
  function addChunk(stream, state, chunk, addToFront) {
    if (state.flowing && state.length === 0 && !state.sync) {
      stream.emit('data', chunk);
      stream.read(0);
    } else {
      // update the buffer info.
      state.length += state.objectMode ? 1 : chunk.length;
      if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
  
      if (state.needReadable) emitReadable(stream);
    }
    maybeReadMore(stream, state);
  }
  
  function chunkInvalid(state, chunk) {
    var er;
    if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
      er = new TypeError('Invalid non-string/buffer chunk');
    }
    return er;
  }
  
  // if it's past the high water mark, we can push in some more.
  // Also, if we have no data yet, we can stand some
  // more bytes.  This is to work around cases where hwm=0,
  // such as the repl.  Also, if the push() triggered a
  // readable event, and the user called read(largeNumber) such that
  // needReadable was set, then we ought to push more, so that another
  // 'readable' event will be triggered.
  function needMoreData(state) {
    return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
  }
  
  Readable.prototype.isPaused = function () {
    return this._readableState.flowing === false;
  };
  
  // backwards compatibility.
  Readable.prototype.setEncoding = function (enc) {
    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
    this._readableState.decoder = new StringDecoder(enc);
    this._readableState.encoding = enc;
    return this;
  };
  
  // Don't raise the hwm > 8MB
  var MAX_HWM = 0x800000;
  function computeNewHighWaterMark(n) {
    if (n >= MAX_HWM) {
      n = MAX_HWM;
    } else {
      // Get the next highest power of 2 to prevent increasing hwm excessively in
      // tiny amounts
      n--;
      n |= n >>> 1;
      n |= n >>> 2;
      n |= n >>> 4;
      n |= n >>> 8;
      n |= n >>> 16;
      n++;
    }
    return n;
  }
  
  // This function is designed to be inlinable, so please take care when making
  // changes to the function body.
  function howMuchToRead(n, state) {
    if (n <= 0 || state.length === 0 && state.ended) return 0;
    if (state.objectMode) return 1;
    if (n !== n) {
      // Only flow one buffer at a time
      if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
    }
    // If we're asking for more than the current hwm, then raise the hwm.
    if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
    if (n <= state.length) return n;
    // Don't have enough
    if (!state.ended) {
      state.needReadable = true;
      return 0;
    }
    return state.length;
  }
  
  // you can override either this method, or the async _read(n) below.
  Readable.prototype.read = function (n) {
    debug('read', n);
    n = parseInt(n, 10);
    var state = this._readableState;
    var nOrig = n;
  
    if (n !== 0) state.emittedReadable = false;
  
    // if we're doing read(0) to trigger a readable event, but we
    // already have a bunch of data in the buffer, then just trigger
    // the 'readable' event and move on.
    if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
      debug('read: emitReadable', state.length, state.ended);
      if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
      return null;
    }
  
    n = howMuchToRead(n, state);
  
    // if we've ended, and we're now clear, then finish it up.
    if (n === 0 && state.ended) {
      if (state.length === 0) endReadable(this);
      return null;
    }
  
    // All the actual chunk generation logic needs to be
    // *below* the call to _read.  The reason is that in certain
    // synthetic stream cases, such as passthrough streams, _read
    // may be a completely synchronous operation which may change
    // the state of the read buffer, providing enough data when
    // before there was *not* enough.
    //
    // So, the steps are:
    // 1. Figure out what the state of things will be after we do
    // a read from the buffer.
    //
    // 2. If that resulting state will trigger a _read, then call _read.
    // Note that this may be asynchronous, or synchronous.  Yes, it is
    // deeply ugly to write APIs this way, but that still doesn't mean
    // that the Readable class should behave improperly, as streams are
    // designed to be sync/async agnostic.
    // Take note if the _read call is sync or async (ie, if the read call
    // has returned yet), so that we know whether or not it's safe to emit
    // 'readable' etc.
    //
    // 3. Actually pull the requested chunks out of the buffer and return.
  
    // if we need a readable event, then we need to do some reading.
    var doRead = state.needReadable;
    debug('need readable', doRead);
  
    // if we currently have less than the highWaterMark, then also read some
    if (state.length === 0 || state.length - n < state.highWaterMark) {
      doRead = true;
      debug('length less than watermark', doRead);
    }
  
    // however, if we've ended, then there's no point, and if we're already
    // reading, then it's unnecessary.
    if (state.ended || state.reading) {
      doRead = false;
      debug('reading or ended', doRead);
    } else if (doRead) {
      debug('do read');
      state.reading = true;
      state.sync = true;
      // if the length is currently zero, then we *need* a readable event.
      if (state.length === 0) state.needReadable = true;
      // call internal read method
      this._read(state.highWaterMark);
      state.sync = false;
      // If _read pushed data synchronously, then `reading` will be false,
      // and we need to re-evaluate how much data we can return to the user.
      if (!state.reading) n = howMuchToRead(nOrig, state);
    }
  
    var ret;
    if (n > 0) ret = fromList(n, state);else ret = null;
  
    if (ret === null) {
      state.needReadable = true;
      n = 0;
    } else {
      state.length -= n;
    }
  
    if (state.length === 0) {
      // If we have nothing in the buffer, then we want to know
      // as soon as we *do* get something into the buffer.
      if (!state.ended) state.needReadable = true;
  
      // If we tried to read() past the EOF, then emit end on the next tick.
      if (nOrig !== n && state.ended) endReadable(this);
    }
  
    if (ret !== null) this.emit('data', ret);
  
    return ret;
  };
  
  function onEofChunk(stream, state) {
    if (state.ended) return;
    if (state.decoder) {
      var chunk = state.decoder.end();
      if (chunk && chunk.length) {
        state.buffer.push(chunk);
        state.length += state.objectMode ? 1 : chunk.length;
      }
    }
    state.ended = true;
  
    // emit 'readable' now to make sure it gets picked up.
    emitReadable(stream);
  }
  
  // Don't emit readable right away in sync mode, because this can trigger
  // another read() call => stack overflow.  This way, it might trigger
  // a nextTick recursion warning, but that's not so bad.
  function emitReadable(stream) {
    var state = stream._readableState;
    state.needReadable = false;
    if (!state.emittedReadable) {
      debug('emitReadable', state.flowing);
      state.emittedReadable = true;
      if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
    }
  }
  
  function emitReadable_(stream) {
    debug('emit readable');
    stream.emit('readable');
    flow(stream);
  }
  
  // at this point, the user has presumably seen the 'readable' event,
  // and called read() to consume some data.  that may have triggered
  // in turn another _read(n) call, in which case reading = true if
  // it's in progress.
  // However, if we're not ended, or reading, and the length < hwm,
  // then go ahead and try to read some more preemptively.
  function maybeReadMore(stream, state) {
    if (!state.readingMore) {
      state.readingMore = true;
      processNextTick(maybeReadMore_, stream, state);
    }
  }
  
  function maybeReadMore_(stream, state) {
    var len = state.length;
    while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
      debug('maybeReadMore read 0');
      stream.read(0);
      if (len === state.length)
        // didn't get any data, stop spinning.
        break;else len = state.length;
    }
    state.readingMore = false;
  }
  
  // abstract method.  to be overridden in specific implementation classes.
  // call cb(er, data) where data is <= n in length.
  // for virtual (non-string, non-buffer) streams, "length" is somewhat
  // arbitrary, and perhaps not very meaningful.
  Readable.prototype._read = function (n) {
    this.emit('error', new Error('_read() is not implemented'));
  };
  
  Readable.prototype.pipe = function (dest, pipeOpts) {
    var src = this;
    var state = this._readableState;
  
    switch (state.pipesCount) {
      case 0:
        state.pipes = dest;
        break;
      case 1:
        state.pipes = [state.pipes, dest];
        break;
      default:
        state.pipes.push(dest);
        break;
    }
    state.pipesCount += 1;
    debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
  
    var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
  
    var endFn = doEnd ? onend : unpipe;
    if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);
  
    dest.on('unpipe', onunpipe);
    function onunpipe(readable, unpipeInfo) {
      debug('onunpipe');
      if (readable === src) {
        if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
          unpipeInfo.hasUnpiped = true;
          cleanup();
        }
      }
    }
  
    function onend() {
      debug('onend');
      dest.end();
    }
  
    // when the dest drains, it reduces the awaitDrain counter
    // on the source.  This would be more elegant with a .once()
    // handler in flow(), but adding and removing repeatedly is
    // too slow.
    var ondrain = pipeOnDrain(src);
    dest.on('drain', ondrain);
  
    var cleanedUp = false;
    function cleanup() {
      debug('cleanup');
      // cleanup event handlers once the pipe is broken
      dest.removeListener('close', onclose);
      dest.removeListener('finish', onfinish);
      dest.removeListener('drain', ondrain);
      dest.removeListener('error', onerror);
      dest.removeListener('unpipe', onunpipe);
      src.removeListener('end', onend);
      src.removeListener('end', unpipe);
      src.removeListener('data', ondata);
  
      cleanedUp = true;
  
      // if the reader is waiting for a drain event from this
      // specific writer, then it would cause it to never start
      // flowing again.
      // So, if this is awaiting a drain, then we just call it now.
      // If we don't know, then assume that we are waiting for one.
      if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
    }
  
    // If the user pushes more data while we're writing to dest then we'll end up
    // in ondata again. However, we only want to increase awaitDrain once because
    // dest will only emit one 'drain' event for the multiple writes.
    // => Introduce a guard on increasing awaitDrain.
    var increasedAwaitDrain = false;
    src.on('data', ondata);
    function ondata(chunk) {
      debug('ondata');
      increasedAwaitDrain = false;
      var ret = dest.write(chunk);
      if (false === ret && !increasedAwaitDrain) {
        // If the user unpiped during `dest.write()`, it is possible
        // to get stuck in a permanently paused state if that write
        // also returned false.
        // => Check whether `dest` is still a piping destination.
        if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
          debug('false write response, pause', src._readableState.awaitDrain);
          src._readableState.awaitDrain++;
          increasedAwaitDrain = true;
        }
        src.pause();
      }
    }
  
    // if the dest has an error, then stop piping into it.
    // however, don't suppress the throwing behavior for this.
    function onerror(er) {
      debug('onerror', er);
      unpipe();
      dest.removeListener('error', onerror);
      if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
    }
  
    // Make sure our error handler is attached before userland ones.
    prependListener(dest, 'error', onerror);
  
    // Both close and finish should trigger unpipe, but only once.
    function onclose() {
      dest.removeListener('finish', onfinish);
      unpipe();
    }
    dest.once('close', onclose);
    function onfinish() {
      debug('onfinish');
      dest.removeListener('close', onclose);
      unpipe();
    }
    dest.once('finish', onfinish);
  
    function unpipe() {
      debug('unpipe');
      src.unpipe(dest);
    }
  
    // tell the dest that it's being piped to
    dest.emit('pipe', src);
  
    // start the flow if it hasn't been started already.
    if (!state.flowing) {
      debug('pipe resume');
      src.resume();
    }
  
    return dest;
  };
  
  function pipeOnDrain(src) {
    return function () {
      var state = src._readableState;
      debug('pipeOnDrain', state.awaitDrain);
      if (state.awaitDrain) state.awaitDrain--;
      if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
        state.flowing = true;
        flow(src);
      }
    };
  }
  
  Readable.prototype.unpipe = function (dest) {
    var state = this._readableState;
    var unpipeInfo = { hasUnpiped: false };
  
    // if we're not piping anywhere, then do nothing.
    if (state.pipesCount === 0) return this;
  
    // just one destination.  most common case.
    if (state.pipesCount === 1) {
      // passed in one, but it's not the right one.
      if (dest && dest !== state.pipes) return this;
  
      if (!dest) dest = state.pipes;
  
      // got a match.
      state.pipes = null;
      state.pipesCount = 0;
      state.flowing = false;
      if (dest) dest.emit('unpipe', this, unpipeInfo);
      return this;
    }
  
    // slow case. multiple pipe destinations.
  
    if (!dest) {
      // remove all.
      var dests = state.pipes;
      var len = state.pipesCount;
      state.pipes = null;
      state.pipesCount = 0;
      state.flowing = false;
  
      for (var i = 0; i < len; i++) {
        dests[i].emit('unpipe', this, unpipeInfo);
      }return this;
    }
  
    // try to find the right one.
    var index = indexOf(state.pipes, dest);
    if (index === -1) return this;
  
    state.pipes.splice(index, 1);
    state.pipesCount -= 1;
    if (state.pipesCount === 1) state.pipes = state.pipes[0];
  
    dest.emit('unpipe', this, unpipeInfo);
  
    return this;
  };
  
  // set up data events if they are asked for
  // Ensure readable listeners eventually get something
  Readable.prototype.on = function (ev, fn) {
    var res = Stream.prototype.on.call(this, ev, fn);
  
    if (ev === 'data') {
      // Start flowing on next tick if stream isn't explicitly paused
      if (this._readableState.flowing !== false) this.resume();
    } else if (ev === 'readable') {
      var state = this._readableState;
      if (!state.endEmitted && !state.readableListening) {
        state.readableListening = state.needReadable = true;
        state.emittedReadable = false;
        if (!state.reading) {
          processNextTick(nReadingNextTick, this);
        } else if (state.length) {
          emitReadable(this);
        }
      }
    }
  
    return res;
  };
  Readable.prototype.addListener = Readable.prototype.on;
  
  function nReadingNextTick(self) {
    debug('readable nexttick read 0');
    self.read(0);
  }
  
  // pause() and resume() are remnants of the legacy readable stream API
  // If the user uses them, then switch into old mode.
  Readable.prototype.resume = function () {
    var state = this._readableState;
    if (!state.flowing) {
      debug('resume');
      state.flowing = true;
      resume(this, state);
    }
    return this;
  };
  
  function resume(stream, state) {
    if (!state.resumeScheduled) {
      state.resumeScheduled = true;
      processNextTick(resume_, stream, state);
    }
  }
  
  function resume_(stream, state) {
    if (!state.reading) {
      debug('resume read 0');
      stream.read(0);
    }
  
    state.resumeScheduled = false;
    state.awaitDrain = 0;
    stream.emit('resume');
    flow(stream);
    if (state.flowing && !state.reading) stream.read(0);
  }
  
  Readable.prototype.pause = function () {
    debug('call pause flowing=%j', this._readableState.flowing);
    if (false !== this._readableState.flowing) {
      debug('pause');
      this._readableState.flowing = false;
      this.emit('pause');
    }
    return this;
  };
  
  function flow(stream) {
    var state = stream._readableState;
    debug('flow', state.flowing);
    while (state.flowing && stream.read() !== null) {}
  }
  
  // wrap an old-style stream as the async data source.
  // This is *not* part of the readable stream interface.
  // It is an ugly unfortunate mess of history.
  Readable.prototype.wrap = function (stream) {
    var _this = this;
  
    var state = this._readableState;
    var paused = false;
  
    stream.on('end', function () {
      debug('wrapped end');
      if (state.decoder && !state.ended) {
        var chunk = state.decoder.end();
        if (chunk && chunk.length) _this.push(chunk);
      }
  
      _this.push(null);
    });
  
    stream.on('data', function (chunk) {
      debug('wrapped data');
      if (state.decoder) chunk = state.decoder.write(chunk);
  
      // don't skip over falsy values in objectMode
      if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
  
      var ret = _this.push(chunk);
      if (!ret) {
        paused = true;
        stream.pause();
      }
    });
  
    // proxy all the other methods.
    // important when wrapping filters and duplexes.
    for (var i in stream) {
      if (this[i] === undefined && typeof stream[i] === 'function') {
        this[i] = function (method) {
          return function () {
            return stream[method].apply(stream, arguments);
          };
        }(i);
      }
    }
  
    // proxy certain important events.
    for (var n = 0; n < kProxyEvents.length; n++) {
      stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
    }
  
    // when we try to consume some more bytes, simply unpause the
    // underlying stream.
    this._read = function (n) {
      debug('wrapped _read', n);
      if (paused) {
        paused = false;
        stream.resume();
      }
    };
  
    return this;
  };
  
  // exposed for testing purposes only.
  Readable._fromList = fromList;
  
  // Pluck off n bytes from an array of buffers.
  // Length is the combined lengths of all the buffers in the list.
  // This function is designed to be inlinable, so please take care when making
  // changes to the function body.
  function fromList(n, state) {
    // nothing buffered
    if (state.length === 0) return null;
  
    var ret;
    if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
      // read it all, truncate the list
      if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
      state.buffer.clear();
    } else {
      // read part of list
      ret = fromListPartial(n, state.buffer, state.decoder);
    }
  
    return ret;
  }
  
  // Extracts only enough buffered data to satisfy the amount requested.
  // This function is designed to be inlinable, so please take care when making
  // changes to the function body.
  function fromListPartial(n, list, hasStrings) {
    var ret;
    if (n < list.head.data.length) {
      // slice is the same for buffers and strings
      ret = list.head.data.slice(0, n);
      list.head.data = list.head.data.slice(n);
    } else if (n === list.head.data.length) {
      // first chunk is a perfect match
      ret = list.shift();
    } else {
      // result spans more than one buffer
      ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
    }
    return ret;
  }
  
  // Copies a specified amount of characters from the list of buffered data
  // chunks.
  // This function is designed to be inlinable, so please take care when making
  // changes to the function body.
  function copyFromBufferString(n, list) {
    var p = list.head;
    var c = 1;
    var ret = p.data;
    n -= ret.length;
    while (p = p.next) {
      var str = p.data;
      var nb = n > str.length ? str.length : n;
      if (nb === str.length) ret += str;else ret += str.slice(0, n);
      n -= nb;
      if (n === 0) {
        if (nb === str.length) {
          ++c;
          if (p.next) list.head = p.next;else list.head = list.tail = null;
        } else {
          list.head = p;
          p.data = str.slice(nb);
        }
        break;
      }
      ++c;
    }
    list.length -= c;
    return ret;
  }
  
  // Copies a specified amount of bytes from the list of buffered data chunks.
  // This function is designed to be inlinable, so please take care when making
  // changes to the function body.
  function copyFromBuffer(n, list) {
    var ret = Buffer.allocUnsafe(n);
    var p = list.head;
    var c = 1;
    p.data.copy(ret);
    n -= p.data.length;
    while (p = p.next) {
      var buf = p.data;
      var nb = n > buf.length ? buf.length : n;
      buf.copy(ret, ret.length - n, 0, nb);
      n -= nb;
      if (n === 0) {
        if (nb === buf.length) {
          ++c;
          if (p.next) list.head = p.next;else list.head = list.tail = null;
        } else {
          list.head = p;
          p.data = buf.slice(nb);
        }
        break;
      }
      ++c;
    }
    list.length -= c;
    return ret;
  }
  
  function endReadable(stream) {
    var state = stream._readableState;
  
    // If we get here before consuming all the bytes, then that is a
    // bug in node.  Should never happen.
    if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
  
    if (!state.endEmitted) {
      state.ended = true;
      processNextTick(endReadableNT, state, stream);
    }
  }
  
  function endReadableNT(state, stream) {
    // Check that we didn't get one last unshift.
    if (!state.endEmitted && state.length === 0) {
      state.endEmitted = true;
      stream.readable = false;
      stream.emit('end');
    }
  }
  
  function forEach(xs, f) {
    for (var i = 0, l = xs.length; i < l; i++) {
      f(xs[i], i);
    }
  }
  
  function indexOf(xs, x) {
    for (var i = 0, l = xs.length; i < l; i++) {
      if (xs[i] === x) return i;
    }
    return -1;
  }
  }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"./_stream_duplex":19,"./internal/streams/BufferList":24,"./internal/streams/destroy":25,"./internal/streams/stream":26,"_process":14,"core-util-is":6,"events":7,"inherits":10,"isarray":12,"process-nextick-args":13,"safe-buffer":29,"string_decoder/":27,"util":3}],22:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // a transform stream is a readable/writable stream where you do
  // something with the data.  Sometimes it's called a "filter",
  // but that's not a great name for it, since that implies a thing where
  // some bits pass through, and others are simply ignored.  (That would
  // be a valid example of a transform, of course.)
  //
  // While the output is causally related to the input, it's not a
  // necessarily symmetric or synchronous transformation.  For example,
  // a zlib stream might take multiple plain-text writes(), and then
  // emit a single compressed chunk some time in the future.
  //
  // Here's how this works:
  //
  // The Transform stream has all the aspects of the readable and writable
  // stream classes.  When you write(chunk), that calls _write(chunk,cb)
  // internally, and returns false if there's a lot of pending writes
  // buffered up.  When you call read(), that calls _read(n) until
  // there's enough pending readable data buffered up.
  //
  // In a transform stream, the written data is placed in a buffer.  When
  // _read(n) is called, it transforms the queued up data, calling the
  // buffered _write cb's as it consumes chunks.  If consuming a single
  // written chunk would result in multiple output chunks, then the first
  // outputted bit calls the readcb, and subsequent chunks just go into
  // the read buffer, and will cause it to emit 'readable' if necessary.
  //
  // This way, back-pressure is actually determined by the reading side,
  // since _read has to be called to start processing a new chunk.  However,
  // a pathological inflate type of transform can cause excessive buffering
  // here.  For example, imagine a stream where every byte of input is
  // interpreted as an integer from 0-255, and then results in that many
  // bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
  // 1kb of data being output.  In this case, you could write a very small
  // amount of input, and end up with a very large amount of output.  In
  // such a pathological inflating mechanism, there'd be no way to tell
  // the system to stop doing the transform.  A single 4MB write could
  // cause the system to run out of memory.
  //
  // However, even in such a pathological case, only a single written chunk
  // would be consumed, and then the rest would wait (un-transformed) until
  // the results of the previous transformed chunk were consumed.
  
  'use strict';
  
  module.exports = Transform;
  
  var Duplex = require('./_stream_duplex');
  
  /*<replacement>*/
  var util = require('core-util-is');
  util.inherits = require('inherits');
  /*</replacement>*/
  
  util.inherits(Transform, Duplex);
  
  function afterTransform(er, data) {
    var ts = this._transformState;
    ts.transforming = false;
  
    var cb = ts.writecb;
  
    if (!cb) {
      return this.emit('error', new Error('write callback called multiple times'));
    }
  
    ts.writechunk = null;
    ts.writecb = null;
  
    if (data != null) // single equals check for both `null` and `undefined`
      this.push(data);
  
    cb(er);
  
    var rs = this._readableState;
    rs.reading = false;
    if (rs.needReadable || rs.length < rs.highWaterMark) {
      this._read(rs.highWaterMark);
    }
  }
  
  function Transform(options) {
    if (!(this instanceof Transform)) return new Transform(options);
  
    Duplex.call(this, options);
  
    this._transformState = {
      afterTransform: afterTransform.bind(this),
      needTransform: false,
      transforming: false,
      writecb: null,
      writechunk: null,
      writeencoding: null
    };
  
    // start out asking for a readable event once data is transformed.
    this._readableState.needReadable = true;
  
    // we have implemented the _read method, and done the other things
    // that Readable wants before the first _read call, so unset the
    // sync guard flag.
    this._readableState.sync = false;
  
    if (options) {
      if (typeof options.transform === 'function') this._transform = options.transform;
  
      if (typeof options.flush === 'function') this._flush = options.flush;
    }
  
    // When the writable side finishes, then flush out anything remaining.
    this.on('prefinish', prefinish);
  }
  
  function prefinish() {
    var _this = this;
  
    if (typeof this._flush === 'function') {
      this._flush(function (er, data) {
        done(_this, er, data);
      });
    } else {
      done(this, null, null);
    }
  }
  
  Transform.prototype.push = function (chunk, encoding) {
    this._transformState.needTransform = false;
    return Duplex.prototype.push.call(this, chunk, encoding);
  };
  
  // This is the part where you do stuff!
  // override this function in implementation classes.
  // 'chunk' is an input chunk.
  //
  // Call `push(newChunk)` to pass along transformed output
  // to the readable side.  You may call 'push' zero or more times.
  //
  // Call `cb(err)` when you are done with this chunk.  If you pass
  // an error, then that'll put the hurt on the whole operation.  If you
  // never call cb(), then you'll never get another chunk.
  Transform.prototype._transform = function (chunk, encoding, cb) {
    throw new Error('_transform() is not implemented');
  };
  
  Transform.prototype._write = function (chunk, encoding, cb) {
    var ts = this._transformState;
    ts.writecb = cb;
    ts.writechunk = chunk;
    ts.writeencoding = encoding;
    if (!ts.transforming) {
      var rs = this._readableState;
      if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
    }
  };
  
  // Doesn't matter what the args are here.
  // _transform does all the work.
  // That we got here means that the readable side wants more data.
  Transform.prototype._read = function (n) {
    var ts = this._transformState;
  
    if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
      ts.transforming = true;
      this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
    } else {
      // mark that we need a transform, so that any data that comes in
      // will get processed, now that we've asked for it.
      ts.needTransform = true;
    }
  };
  
  Transform.prototype._destroy = function (err, cb) {
    var _this2 = this;
  
    Duplex.prototype._destroy.call(this, err, function (err2) {
      cb(err2);
      _this2.emit('close');
    });
  };
  
  function done(stream, er, data) {
    if (er) return stream.emit('error', er);
  
    if (data != null) // single equals check for both `null` and `undefined`
      stream.push(data);
  
    // if there's nothing in the write buffer, then that means
    // that nothing more will ever be provided
    if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0');
  
    if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming');
  
    return stream.push(null);
  }
  },{"./_stream_duplex":19,"core-util-is":6,"inherits":10}],23:[function(require,module,exports){
  (function (process,global){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // A bit simpler than readable streams.
  // Implement an async ._write(chunk, encoding, cb), and it'll handle all
  // the drain event emission and buffering.
  
  'use strict';
  
  /*<replacement>*/
  
  var processNextTick = require('process-nextick-args').nextTick;
  /*</replacement>*/
  
  module.exports = Writable;
  
  /* <replacement> */
  function WriteReq(chunk, encoding, cb) {
    this.chunk = chunk;
    this.encoding = encoding;
    this.callback = cb;
    this.next = null;
  }
  
  // It seems a linked list but it is not
  // there will be only 2 of these for each stream
  function CorkedRequest(state) {
    var _this = this;
  
    this.next = null;
    this.entry = null;
    this.finish = function () {
      onCorkedFinish(_this, state);
    };
  }
  /* </replacement> */
  
  /*<replacement>*/
  var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
  /*</replacement>*/
  
  /*<replacement>*/
  var Duplex;
  /*</replacement>*/
  
  Writable.WritableState = WritableState;
  
  /*<replacement>*/
  var util = require('core-util-is');
  util.inherits = require('inherits');
  /*</replacement>*/
  
  /*<replacement>*/
  var internalUtil = {
    deprecate: require('util-deprecate')
  };
  /*</replacement>*/
  
  /*<replacement>*/
  var Stream = require('./internal/streams/stream');
  /*</replacement>*/
  
  /*<replacement>*/
  
  var Buffer = require('safe-buffer').Buffer;
  var OurUint8Array = global.Uint8Array || function () {};
  function _uint8ArrayToBuffer(chunk) {
    return Buffer.from(chunk);
  }
  function _isUint8Array(obj) {
    return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
  }
  
  /*</replacement>*/
  
  var destroyImpl = require('./internal/streams/destroy');
  
  util.inherits(Writable, Stream);
  
  function nop() {}
  
  function WritableState(options, stream) {
    Duplex = Duplex || require('./_stream_duplex');
  
    options = options || {};
  
    // Duplex streams are both readable and writable, but share
    // the same options object.
    // However, some cases require setting options to different
    // values for the readable and the writable sides of the duplex stream.
    // These options can be provided separately as readableXXX and writableXXX.
    var isDuplex = stream instanceof Duplex;
  
    // object stream flag to indicate whether or not this stream
    // contains buffers or objects.
    this.objectMode = !!options.objectMode;
  
    if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
  
    // the point at which write() starts returning false
    // Note: 0 is a valid value, means that we always return false if
    // the entire buffer is not flushed immediately on write()
    var hwm = options.highWaterMark;
    var writableHwm = options.writableHighWaterMark;
    var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  
    if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;
  
    // cast to ints.
    this.highWaterMark = Math.floor(this.highWaterMark);
  
    // if _final has been called
    this.finalCalled = false;
  
    // drain event flag.
    this.needDrain = false;
    // at the start of calling end()
    this.ending = false;
    // when end() has been called, and returned
    this.ended = false;
    // when 'finish' is emitted
    this.finished = false;
  
    // has it been destroyed
    this.destroyed = false;
  
    // should we decode strings into buffers before passing to _write?
    // this is here so that some node-core streams can optimize string
    // handling at a lower level.
    var noDecode = options.decodeStrings === false;
    this.decodeStrings = !noDecode;
  
    // Crypto is kind of old and crusty.  Historically, its default string
    // encoding is 'binary' so we have to make this configurable.
    // Everything else in the universe uses 'utf8', though.
    this.defaultEncoding = options.defaultEncoding || 'utf8';
  
    // not an actual buffer we keep track of, but a measurement
    // of how much we're waiting to get pushed to some underlying
    // socket or file.
    this.length = 0;
  
    // a flag to see when we're in the middle of a write.
    this.writing = false;
  
    // when true all writes will be buffered until .uncork() call
    this.corked = 0;
  
    // a flag to be able to tell if the onwrite cb is called immediately,
    // or on a later tick.  We set this to true at first, because any
    // actions that shouldn't happen until "later" should generally also
    // not happen before the first write call.
    this.sync = true;
  
    // a flag to know if we're processing previously buffered items, which
    // may call the _write() callback in the same tick, so that we don't
    // end up in an overlapped onwrite situation.
    this.bufferProcessing = false;
  
    // the callback that's passed to _write(chunk,cb)
    this.onwrite = function (er) {
      onwrite(stream, er);
    };
  
    // the callback that the user supplies to write(chunk,encoding,cb)
    this.writecb = null;
  
    // the amount that is being written when _write is called.
    this.writelen = 0;
  
    this.bufferedRequest = null;
    this.lastBufferedRequest = null;
  
    // number of pending user-supplied write callbacks
    // this must be 0 before 'finish' can be emitted
    this.pendingcb = 0;
  
    // emit prefinish if the only thing we're waiting for is _write cbs
    // This is relevant for synchronous Transform streams
    this.prefinished = false;
  
    // True if the error was already emitted and should not be thrown again
    this.errorEmitted = false;
  
    // count buffered requests
    this.bufferedRequestCount = 0;
  
    // allocate the first CorkedRequest, there is always
    // one allocated and free to use, and we maintain at most two
    this.corkedRequestsFree = new CorkedRequest(this);
  }
  
  WritableState.prototype.getBuffer = function getBuffer() {
    var current = this.bufferedRequest;
    var out = [];
    while (current) {
      out.push(current);
      current = current.next;
    }
    return out;
  };
  
  (function () {
    try {
      Object.defineProperty(WritableState.prototype, 'buffer', {
        get: internalUtil.deprecate(function () {
          return this.getBuffer();
        }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
      });
    } catch (_) {}
  })();
  
  // Test _writableState for inheritance to account for Duplex streams,
  // whose prototype chain only points to Readable.
  var realHasInstance;
  if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
    realHasInstance = Function.prototype[Symbol.hasInstance];
    Object.defineProperty(Writable, Symbol.hasInstance, {
      value: function (object) {
        if (realHasInstance.call(this, object)) return true;
        if (this !== Writable) return false;
  
        return object && object._writableState instanceof WritableState;
      }
    });
  } else {
    realHasInstance = function (object) {
      return object instanceof this;
    };
  }
  
  function Writable(options) {
    Duplex = Duplex || require('./_stream_duplex');
  
    // Writable ctor is applied to Duplexes, too.
    // `realHasInstance` is necessary because using plain `instanceof`
    // would return false, as no `_writableState` property is attached.
  
    // Trying to use the custom `instanceof` for Writable here will also break the
    // Node.js LazyTransform implementation, which has a non-trivial getter for
    // `_writableState` that would lead to infinite recursion.
    if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
      return new Writable(options);
    }
  
    this._writableState = new WritableState(options, this);
  
    // legacy.
    this.writable = true;
  
    if (options) {
      if (typeof options.write === 'function') this._write = options.write;
  
      if (typeof options.writev === 'function') this._writev = options.writev;
  
      if (typeof options.destroy === 'function') this._destroy = options.destroy;
  
      if (typeof options.final === 'function') this._final = options.final;
    }
  
    Stream.call(this);
  }
  
  // Otherwise people can pipe Writable streams, which is just wrong.
  Writable.prototype.pipe = function () {
    this.emit('error', new Error('Cannot pipe, not readable'));
  };
  
  function writeAfterEnd(stream, cb) {
    var er = new Error('write after end');
    // TODO: defer error events consistently everywhere, not just the cb
    stream.emit('error', er);
    processNextTick(cb, er);
  }
  
  // Checks that a user-supplied chunk is valid, especially for the particular
  // mode the stream is in. Currently this means that `null` is never accepted
  // and undefined/non-string values are only allowed in object mode.
  function validChunk(stream, state, chunk, cb) {
    var valid = true;
    var er = false;
  
    if (chunk === null) {
      er = new TypeError('May not write null values to stream');
    } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
      er = new TypeError('Invalid non-string/buffer chunk');
    }
    if (er) {
      stream.emit('error', er);
      processNextTick(cb, er);
      valid = false;
    }
    return valid;
  }
  
  Writable.prototype.write = function (chunk, encoding, cb) {
    var state = this._writableState;
    var ret = false;
    var isBuf = !state.objectMode && _isUint8Array(chunk);
  
    if (isBuf && !Buffer.isBuffer(chunk)) {
      chunk = _uint8ArrayToBuffer(chunk);
    }
  
    if (typeof encoding === 'function') {
      cb = encoding;
      encoding = null;
    }
  
    if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
  
    if (typeof cb !== 'function') cb = nop;
  
    if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
      state.pendingcb++;
      ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
    }
  
    return ret;
  };
  
  Writable.prototype.cork = function () {
    var state = this._writableState;
  
    state.corked++;
  };
  
  Writable.prototype.uncork = function () {
    var state = this._writableState;
  
    if (state.corked) {
      state.corked--;
  
      if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
    }
  };
  
  Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
    // node::ParseEncoding() requires lower case.
    if (typeof encoding === 'string') encoding = encoding.toLowerCase();
    if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
    this._writableState.defaultEncoding = encoding;
    return this;
  };
  
  function decodeChunk(state, chunk, encoding) {
    if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
      chunk = Buffer.from(chunk, encoding);
    }
    return chunk;
  }
  
  // if we're already writing something, then just put this
  // in the queue, and wait our turn.  Otherwise, call _write
  // If we return false, then we need a drain event, so set that flag.
  function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
    if (!isBuf) {
      var newChunk = decodeChunk(state, chunk, encoding);
      if (chunk !== newChunk) {
        isBuf = true;
        encoding = 'buffer';
        chunk = newChunk;
      }
    }
    var len = state.objectMode ? 1 : chunk.length;
  
    state.length += len;
  
    var ret = state.length < state.highWaterMark;
    // we must ensure that previous needDrain will not be reset to false.
    if (!ret) state.needDrain = true;
  
    if (state.writing || state.corked) {
      var last = state.lastBufferedRequest;
      state.lastBufferedRequest = {
        chunk: chunk,
        encoding: encoding,
        isBuf: isBuf,
        callback: cb,
        next: null
      };
      if (last) {
        last.next = state.lastBufferedRequest;
      } else {
        state.bufferedRequest = state.lastBufferedRequest;
      }
      state.bufferedRequestCount += 1;
    } else {
      doWrite(stream, state, false, len, chunk, encoding, cb);
    }
  
    return ret;
  }
  
  function doWrite(stream, state, writev, len, chunk, encoding, cb) {
    state.writelen = len;
    state.writecb = cb;
    state.writing = true;
    state.sync = true;
    if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
    state.sync = false;
  }
  
  function onwriteError(stream, state, sync, er, cb) {
    --state.pendingcb;
  
    if (sync) {
      // defer the callback if we are being called synchronously
      // to avoid piling up things on the stack
      processNextTick(cb, er);
      // this can emit finish, and it will always happen
      // after error
      processNextTick(finishMaybe, stream, state);
      stream._writableState.errorEmitted = true;
      stream.emit('error', er);
    } else {
      // the caller expect this to happen before if
      // it is async
      cb(er);
      stream._writableState.errorEmitted = true;
      stream.emit('error', er);
      // this can emit finish, but finish must
      // always follow error
      finishMaybe(stream, state);
    }
  }
  
  function onwriteStateUpdate(state) {
    state.writing = false;
    state.writecb = null;
    state.length -= state.writelen;
    state.writelen = 0;
  }
  
  function onwrite(stream, er) {
    var state = stream._writableState;
    var sync = state.sync;
    var cb = state.writecb;
  
    onwriteStateUpdate(state);
  
    if (er) onwriteError(stream, state, sync, er, cb);else {
      // Check if we're actually ready to finish, but don't emit yet
      var finished = needFinish(state);
  
      if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
        clearBuffer(stream, state);
      }
  
      if (sync) {
        /*<replacement>*/
        asyncWrite(afterWrite, stream, state, finished, cb);
        /*</replacement>*/
      } else {
        afterWrite(stream, state, finished, cb);
      }
    }
  }
  
  function afterWrite(stream, state, finished, cb) {
    if (!finished) onwriteDrain(stream, state);
    state.pendingcb--;
    cb();
    finishMaybe(stream, state);
  }
  
  // Must force callback to be called on nextTick, so that we don't
  // emit 'drain' before the write() consumer gets the 'false' return
  // value, and has a chance to attach a 'drain' listener.
  function onwriteDrain(stream, state) {
    if (state.length === 0 && state.needDrain) {
      state.needDrain = false;
      stream.emit('drain');
    }
  }
  
  // if there's something in the buffer waiting, then process it
  function clearBuffer(stream, state) {
    state.bufferProcessing = true;
    var entry = state.bufferedRequest;
  
    if (stream._writev && entry && entry.next) {
      // Fast case, write everything using _writev()
      var l = state.bufferedRequestCount;
      var buffer = new Array(l);
      var holder = state.corkedRequestsFree;
      holder.entry = entry;
  
      var count = 0;
      var allBuffers = true;
      while (entry) {
        buffer[count] = entry;
        if (!entry.isBuf) allBuffers = false;
        entry = entry.next;
        count += 1;
      }
      buffer.allBuffers = allBuffers;
  
      doWrite(stream, state, true, state.length, buffer, '', holder.finish);
  
      // doWrite is almost always async, defer these to save a bit of time
      // as the hot path ends with doWrite
      state.pendingcb++;
      state.lastBufferedRequest = null;
      if (holder.next) {
        state.corkedRequestsFree = holder.next;
        holder.next = null;
      } else {
        state.corkedRequestsFree = new CorkedRequest(state);
      }
      state.bufferedRequestCount = 0;
    } else {
      // Slow case, write chunks one-by-one
      while (entry) {
        var chunk = entry.chunk;
        var encoding = entry.encoding;
        var cb = entry.callback;
        var len = state.objectMode ? 1 : chunk.length;
  
        doWrite(stream, state, false, len, chunk, encoding, cb);
        entry = entry.next;
        state.bufferedRequestCount--;
        // if we didn't call the onwrite immediately, then
        // it means that we need to wait until it does.
        // also, that means that the chunk and cb are currently
        // being processed, so move the buffer counter past them.
        if (state.writing) {
          break;
        }
      }
  
      if (entry === null) state.lastBufferedRequest = null;
    }
  
    state.bufferedRequest = entry;
    state.bufferProcessing = false;
  }
  
  Writable.prototype._write = function (chunk, encoding, cb) {
    cb(new Error('_write() is not implemented'));
  };
  
  Writable.prototype._writev = null;
  
  Writable.prototype.end = function (chunk, encoding, cb) {
    var state = this._writableState;
  
    if (typeof chunk === 'function') {
      cb = chunk;
      chunk = null;
      encoding = null;
    } else if (typeof encoding === 'function') {
      cb = encoding;
      encoding = null;
    }
  
    if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
  
    // .end() fully uncorks
    if (state.corked) {
      state.corked = 1;
      this.uncork();
    }
  
    // ignore unnecessary end() calls.
    if (!state.ending && !state.finished) endWritable(this, state, cb);
  };
  
  function needFinish(state) {
    return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
  }
  function callFinal(stream, state) {
    stream._final(function (err) {
      state.pendingcb--;
      if (err) {
        stream.emit('error', err);
      }
      state.prefinished = true;
      stream.emit('prefinish');
      finishMaybe(stream, state);
    });
  }
  function prefinish(stream, state) {
    if (!state.prefinished && !state.finalCalled) {
      if (typeof stream._final === 'function') {
        state.pendingcb++;
        state.finalCalled = true;
        processNextTick(callFinal, stream, state);
      } else {
        state.prefinished = true;
        stream.emit('prefinish');
      }
    }
  }
  
  function finishMaybe(stream, state) {
    var need = needFinish(state);
    if (need) {
      prefinish(stream, state);
      if (state.pendingcb === 0) {
        state.finished = true;
        stream.emit('finish');
      }
    }
    return need;
  }
  
  function endWritable(stream, state, cb) {
    state.ending = true;
    finishMaybe(stream, state);
    if (cb) {
      if (state.finished) processNextTick(cb);else stream.once('finish', cb);
    }
    state.ended = true;
    stream.writable = false;
  }
  
  function onCorkedFinish(corkReq, state, err) {
    var entry = corkReq.entry;
    corkReq.entry = null;
    while (entry) {
      var cb = entry.callback;
      state.pendingcb--;
      cb(err);
      entry = entry.next;
    }
    if (state.corkedRequestsFree) {
      state.corkedRequestsFree.next = corkReq;
    } else {
      state.corkedRequestsFree = corkReq;
    }
  }
  
  Object.defineProperty(Writable.prototype, 'destroyed', {
    get: function () {
      if (this._writableState === undefined) {
        return false;
      }
      return this._writableState.destroyed;
    },
    set: function (value) {
      // we ignore the value if the stream
      // has not been initialized yet
      if (!this._writableState) {
        return;
      }
  
      // backward compatibility, the user is explicitly
      // managing destroyed
      this._writableState.destroyed = value;
    }
  });
  
  Writable.prototype.destroy = destroyImpl.destroy;
  Writable.prototype._undestroy = destroyImpl.undestroy;
  Writable.prototype._destroy = function (err, cb) {
    this.end();
    cb(err);
  };
  }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"./_stream_duplex":19,"./internal/streams/destroy":25,"./internal/streams/stream":26,"_process":14,"core-util-is":6,"inherits":10,"process-nextick-args":13,"safe-buffer":29,"util-deprecate":37}],24:[function(require,module,exports){
  'use strict';
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var Buffer = require('safe-buffer').Buffer;
  var util = require('util');
  
  function copyBuffer(src, target, offset) {
    src.copy(target, offset);
  }
  
  module.exports = function () {
    function BufferList() {
      _classCallCheck(this, BufferList);
  
      this.head = null;
      this.tail = null;
      this.length = 0;
    }
  
    BufferList.prototype.push = function push(v) {
      var entry = { data: v, next: null };
      if (this.length > 0) this.tail.next = entry;else this.head = entry;
      this.tail = entry;
      ++this.length;
    };
  
    BufferList.prototype.unshift = function unshift(v) {
      var entry = { data: v, next: this.head };
      if (this.length === 0) this.tail = entry;
      this.head = entry;
      ++this.length;
    };
  
    BufferList.prototype.shift = function shift() {
      if (this.length === 0) return;
      var ret = this.head.data;
      if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
      --this.length;
      return ret;
    };
  
    BufferList.prototype.clear = function clear() {
      this.head = this.tail = null;
      this.length = 0;
    };
  
    BufferList.prototype.join = function join(s) {
      if (this.length === 0) return '';
      var p = this.head;
      var ret = '' + p.data;
      while (p = p.next) {
        ret += s + p.data;
      }return ret;
    };
  
    BufferList.prototype.concat = function concat(n) {
      if (this.length === 0) return Buffer.alloc(0);
      if (this.length === 1) return this.head.data;
      var ret = Buffer.allocUnsafe(n >>> 0);
      var p = this.head;
      var i = 0;
      while (p) {
        copyBuffer(p.data, ret, i);
        i += p.data.length;
        p = p.next;
      }
      return ret;
    };
  
    return BufferList;
  }();
  
  if (util && util.inspect && util.inspect.custom) {
    module.exports.prototype[util.inspect.custom] = function () {
      var obj = util.inspect({ length: this.length });
      return this.constructor.name + ' ' + obj;
    };
  }
  },{"safe-buffer":29,"util":3}],25:[function(require,module,exports){
  'use strict';
  
  /*<replacement>*/
  
  var processNextTick = require('process-nextick-args').nextTick;
  /*</replacement>*/
  
  // undocumented cb() API, needed for core, not for public API
  function destroy(err, cb) {
    var _this = this;
  
    var readableDestroyed = this._readableState && this._readableState.destroyed;
    var writableDestroyed = this._writableState && this._writableState.destroyed;
  
    if (readableDestroyed || writableDestroyed) {
      if (cb) {
        cb(err);
      } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
        processNextTick(emitErrorNT, this, err);
      }
      return this;
    }
  
    // we set destroyed to true before firing error callbacks in order
    // to make it re-entrance safe in case destroy() is called within callbacks
  
    if (this._readableState) {
      this._readableState.destroyed = true;
    }
  
    // if this is a duplex stream mark the writable part as destroyed as well
    if (this._writableState) {
      this._writableState.destroyed = true;
    }
  
    this._destroy(err || null, function (err) {
      if (!cb && err) {
        processNextTick(emitErrorNT, _this, err);
        if (_this._writableState) {
          _this._writableState.errorEmitted = true;
        }
      } else if (cb) {
        cb(err);
      }
    });
  
    return this;
  }
  
  function undestroy() {
    if (this._readableState) {
      this._readableState.destroyed = false;
      this._readableState.reading = false;
      this._readableState.ended = false;
      this._readableState.endEmitted = false;
    }
  
    if (this._writableState) {
      this._writableState.destroyed = false;
      this._writableState.ended = false;
      this._writableState.ending = false;
      this._writableState.finished = false;
      this._writableState.errorEmitted = false;
    }
  }
  
  function emitErrorNT(self, err) {
    self.emit('error', err);
  }
  
  module.exports = {
    destroy: destroy,
    undestroy: undestroy
  };
  },{"process-nextick-args":13}],26:[function(require,module,exports){
  module.exports = require('events').EventEmitter;
  
  },{"events":7}],27:[function(require,module,exports){
  'use strict';
  
  var Buffer = require('safe-buffer').Buffer;
  
  var isEncoding = Buffer.isEncoding || function (encoding) {
    encoding = '' + encoding;
    switch (encoding && encoding.toLowerCase()) {
      case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
        return true;
      default:
        return false;
    }
  };
  
  function _normalizeEncoding(enc) {
    if (!enc) return 'utf8';
    var retried;
    while (true) {
      switch (enc) {
        case 'utf8':
        case 'utf-8':
          return 'utf8';
        case 'ucs2':
        case 'ucs-2':
        case 'utf16le':
        case 'utf-16le':
          return 'utf16le';
        case 'latin1':
        case 'binary':
          return 'latin1';
        case 'base64':
        case 'ascii':
        case 'hex':
          return enc;
        default:
          if (retried) return; // undefined
          enc = ('' + enc).toLowerCase();
          retried = true;
      }
    }
  };
  
  // Do not cache `Buffer.isEncoding` when checking encoding names as some
  // modules monkey-patch it to support additional encodings
  function normalizeEncoding(enc) {
    var nenc = _normalizeEncoding(enc);
    if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
    return nenc || enc;
  }
  
  // StringDecoder provides an interface for efficiently splitting a series of
  // buffers into a series of JS strings without breaking apart multi-byte
  // characters.
  exports.StringDecoder = StringDecoder;
  function StringDecoder(encoding) {
    this.encoding = normalizeEncoding(encoding);
    var nb;
    switch (this.encoding) {
      case 'utf16le':
        this.text = utf16Text;
        this.end = utf16End;
        nb = 4;
        break;
      case 'utf8':
        this.fillLast = utf8FillLast;
        nb = 4;
        break;
      case 'base64':
        this.text = base64Text;
        this.end = base64End;
        nb = 3;
        break;
      default:
        this.write = simpleWrite;
        this.end = simpleEnd;
        return;
    }
    this.lastNeed = 0;
    this.lastTotal = 0;
    this.lastChar = Buffer.allocUnsafe(nb);
  }
  
  StringDecoder.prototype.write = function (buf) {
    if (buf.length === 0) return '';
    var r;
    var i;
    if (this.lastNeed) {
      r = this.fillLast(buf);
      if (r === undefined) return '';
      i = this.lastNeed;
      this.lastNeed = 0;
    } else {
      i = 0;
    }
    if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
    return r || '';
  };
  
  StringDecoder.prototype.end = utf8End;
  
  // Returns only complete characters in a Buffer
  StringDecoder.prototype.text = utf8Text;
  
  // Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
  StringDecoder.prototype.fillLast = function (buf) {
    if (this.lastNeed <= buf.length) {
      buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
      return this.lastChar.toString(this.encoding, 0, this.lastTotal);
    }
    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
    this.lastNeed -= buf.length;
  };
  
  // Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
  // continuation byte.
  function utf8CheckByte(byte) {
    if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
    return -1;
  }
  
  // Checks at most 3 bytes at the end of a Buffer in order to detect an
  // incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
  // needed to complete the UTF-8 character (if applicable) are returned.
  function utf8CheckIncomplete(self, buf, i) {
    var j = buf.length - 1;
    if (j < i) return 0;
    var nb = utf8CheckByte(buf[j]);
    if (nb >= 0) {
      if (nb > 0) self.lastNeed = nb - 1;
      return nb;
    }
    if (--j < i) return 0;
    nb = utf8CheckByte(buf[j]);
    if (nb >= 0) {
      if (nb > 0) self.lastNeed = nb - 2;
      return nb;
    }
    if (--j < i) return 0;
    nb = utf8CheckByte(buf[j]);
    if (nb >= 0) {
      if (nb > 0) {
        if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
      }
      return nb;
    }
    return 0;
  }
  
  // Validates as many continuation bytes for a multi-byte UTF-8 character as
  // needed or are available. If we see a non-continuation byte where we expect
  // one, we "replace" the validated continuation bytes we've seen so far with
  // UTF-8 replacement characters ('\ufffd'), to match v8's UTF-8 decoding
  // behavior. The continuation byte check is included three times in the case
  // where all of the continuation bytes for a character exist in the same buffer.
  // It is also done this way as a slight performance increase instead of using a
  // loop.
  function utf8CheckExtraBytes(self, buf, p) {
    if ((buf[0] & 0xC0) !== 0x80) {
      self.lastNeed = 0;
      return '\ufffd'.repeat(p);
    }
    if (self.lastNeed > 1 && buf.length > 1) {
      if ((buf[1] & 0xC0) !== 0x80) {
        self.lastNeed = 1;
        return '\ufffd'.repeat(p + 1);
      }
      if (self.lastNeed > 2 && buf.length > 2) {
        if ((buf[2] & 0xC0) !== 0x80) {
          self.lastNeed = 2;
          return '\ufffd'.repeat(p + 2);
        }
      }
    }
  }
  
  // Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
  function utf8FillLast(buf) {
    var p = this.lastTotal - this.lastNeed;
    var r = utf8CheckExtraBytes(this, buf, p);
    if (r !== undefined) return r;
    if (this.lastNeed <= buf.length) {
      buf.copy(this.lastChar, p, 0, this.lastNeed);
      return this.lastChar.toString(this.encoding, 0, this.lastTotal);
    }
    buf.copy(this.lastChar, p, 0, buf.length);
    this.lastNeed -= buf.length;
  }
  
  // Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
  // partial character, the character's bytes are buffered until the required
  // number of bytes are available.
  function utf8Text(buf, i) {
    var total = utf8CheckIncomplete(this, buf, i);
    if (!this.lastNeed) return buf.toString('utf8', i);
    this.lastTotal = total;
    var end = buf.length - (total - this.lastNeed);
    buf.copy(this.lastChar, 0, end);
    return buf.toString('utf8', i, end);
  }
  
  // For UTF-8, a replacement character for each buffered byte of a (partial)
  // character needs to be added to the output.
  function utf8End(buf) {
    var r = buf && buf.length ? this.write(buf) : '';
    if (this.lastNeed) return r + '\ufffd'.repeat(this.lastTotal - this.lastNeed);
    return r;
  }
  
  // UTF-16LE typically needs two bytes per character, but even if we have an even
  // number of bytes available, we need to check if we end on a leading/high
  // surrogate. In that case, we need to wait for the next two bytes in order to
  // decode the last character properly.
  function utf16Text(buf, i) {
    if ((buf.length - i) % 2 === 0) {
      var r = buf.toString('utf16le', i);
      if (r) {
        var c = r.charCodeAt(r.length - 1);
        if (c >= 0xD800 && c <= 0xDBFF) {
          this.lastNeed = 2;
          this.lastTotal = 4;
          this.lastChar[0] = buf[buf.length - 2];
          this.lastChar[1] = buf[buf.length - 1];
          return r.slice(0, -1);
        }
      }
      return r;
    }
    this.lastNeed = 1;
    this.lastTotal = 2;
    this.lastChar[0] = buf[buf.length - 1];
    return buf.toString('utf16le', i, buf.length - 1);
  }
  
  // For UTF-16LE we do not explicitly append special replacement characters if we
  // end on a partial character, we simply let v8 handle that.
  function utf16End(buf) {
    var r = buf && buf.length ? this.write(buf) : '';
    if (this.lastNeed) {
      var end = this.lastTotal - this.lastNeed;
      return r + this.lastChar.toString('utf16le', 0, end);
    }
    return r;
  }
  
  function base64Text(buf, i) {
    var n = (buf.length - i) % 3;
    if (n === 0) return buf.toString('base64', i);
    this.lastNeed = 3 - n;
    this.lastTotal = 3;
    if (n === 1) {
      this.lastChar[0] = buf[buf.length - 1];
    } else {
      this.lastChar[0] = buf[buf.length - 2];
      this.lastChar[1] = buf[buf.length - 1];
    }
    return buf.toString('base64', i, buf.length - n);
  }
  
  function base64End(buf) {
    var r = buf && buf.length ? this.write(buf) : '';
    if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
    return r;
  }
  
  // Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
  function simpleWrite(buf) {
    return buf.toString(this.encoding);
  }
  
  function simpleEnd(buf) {
    return buf && buf.length ? this.write(buf) : '';
  }
  },{"safe-buffer":29}],28:[function(require,module,exports){
  exports = module.exports = require('./lib/_stream_readable.js');
  exports.Stream = exports;
  exports.Readable = exports;
  exports.Writable = require('./lib/_stream_writable.js');
  exports.Duplex = require('./lib/_stream_duplex.js');
  exports.Transform = require('./lib/_stream_transform.js');
  exports.PassThrough = require('./lib/_stream_passthrough.js');
  
  },{"./lib/_stream_duplex.js":19,"./lib/_stream_passthrough.js":20,"./lib/_stream_readable.js":21,"./lib/_stream_transform.js":22,"./lib/_stream_writable.js":23}],29:[function(require,module,exports){
  /* eslint-disable node/no-deprecated-api */
  var buffer = require('buffer')
  var Buffer = buffer.Buffer
  
  // alternative to using Object.keys for old browsers
  function copyProps (src, dst) {
    for (var key in src) {
      dst[key] = src[key]
    }
  }
  if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
    module.exports = buffer
  } else {
    // Copy properties from require('buffer')
    copyProps(buffer, exports)
    exports.Buffer = SafeBuffer
  }
  
  function SafeBuffer (arg, encodingOrOffset, length) {
    return Buffer(arg, encodingOrOffset, length)
  }
  
  // Copy static methods from Buffer
  copyProps(Buffer, SafeBuffer)
  
  SafeBuffer.from = function (arg, encodingOrOffset, length) {
    if (typeof arg === 'number') {
      throw new TypeError('Argument must not be a number')
    }
    return Buffer(arg, encodingOrOffset, length)
  }
  
  SafeBuffer.alloc = function (size, fill, encoding) {
    if (typeof size !== 'number') {
      throw new TypeError('Argument must be a number')
    }
    var buf = Buffer(size)
    if (fill !== undefined) {
      if (typeof encoding === 'string') {
        buf.fill(fill, encoding)
      } else {
        buf.fill(fill)
      }
    } else {
      buf.fill(0)
    }
    return buf
  }
  
  SafeBuffer.allocUnsafe = function (size) {
    if (typeof size !== 'number') {
      throw new TypeError('Argument must be a number')
    }
    return Buffer(size)
  }
  
  SafeBuffer.allocUnsafeSlow = function (size) {
    if (typeof size !== 'number') {
      throw new TypeError('Argument must be a number')
    }
    return buffer.SlowBuffer(size)
  }
  
  },{"buffer":4}],30:[function(require,module,exports){
  (function (global){
  var ClientRequest = require('./lib/request')
  var IncomingMessage = require('./lib/response')
  var extend = require('xtend')
  var statusCodes = require('builtin-status-codes')
  var url = require('url')
  
  var http = exports
  
  http.request = function (opts, cb) {
  	if (typeof opts === 'string')
  		opts = url.parse(opts)
  	else
  		opts = extend(opts)
  
  	// Normally, the page is loaded from http or https, so not specifying a protocol
  	// will result in a (valid) protocol-relative url. However, this won't work if
  	// the protocol is something else, like 'file:'
  	var defaultProtocol = global.location.protocol.search(/^https?:$/) === -1 ? 'http:' : ''
  
  	var protocol = opts.protocol || defaultProtocol
  	var host = opts.hostname || opts.host
  	var port = opts.port
  	var path = opts.path || '/'
  
  	// Necessary for IPv6 addresses
  	if (host && host.indexOf(':') !== -1)
  		host = '[' + host + ']'
  
  	// This may be a relative url. The browser should always be able to interpret it correctly.
  	opts.url = (host ? (protocol + '//' + host) : '') + (port ? ':' + port : '') + path
  	opts.method = (opts.method || 'GET').toUpperCase()
  	opts.headers = opts.headers || {}
  
  	// Also valid opts.auth, opts.mode
  
  	var req = new ClientRequest(opts)
  	if (cb)
  		req.on('response', cb)
  	return req
  }
  
  http.get = function get (opts, cb) {
  	var req = http.request(opts, cb)
  	req.end()
  	return req
  }
  
  http.ClientRequest = ClientRequest
  http.IncomingMessage = IncomingMessage
  
  http.Agent = function () {}
  http.Agent.defaultMaxSockets = 4
  
  http.STATUS_CODES = statusCodes
  
  http.METHODS = [
  	'CHECKOUT',
  	'CONNECT',
  	'COPY',
  	'DELETE',
  	'GET',
  	'HEAD',
  	'LOCK',
  	'M-SEARCH',
  	'MERGE',
  	'MKACTIVITY',
  	'MKCOL',
  	'MOVE',
  	'NOTIFY',
  	'OPTIONS',
  	'PATCH',
  	'POST',
  	'PROPFIND',
  	'PROPPATCH',
  	'PURGE',
  	'PUT',
  	'REPORT',
  	'SEARCH',
  	'SUBSCRIBE',
  	'TRACE',
  	'UNLOCK',
  	'UNSUBSCRIBE'
  ]
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"./lib/request":32,"./lib/response":33,"builtin-status-codes":5,"url":35,"xtend":38}],31:[function(require,module,exports){
  (function (global){
  exports.fetch = isFunction(global.fetch) && isFunction(global.ReadableStream)
  
  exports.writableStream = isFunction(global.WritableStream)
  
  exports.abortController = isFunction(global.AbortController)
  
  exports.blobConstructor = false
  try {
  	new Blob([new ArrayBuffer(1)])
  	exports.blobConstructor = true
  } catch (e) {}
  
  // The xhr request to example.com may violate some restrictive CSP configurations,
  // so if we're running in a browser that supports `fetch`, avoid calling getXHR()
  // and assume support for certain features below.
  var xhr
  function getXHR () {
  	// Cache the xhr value
  	if (xhr !== undefined) return xhr
  
  	if (global.XMLHttpRequest) {
  		xhr = new global.XMLHttpRequest()
  		// If XDomainRequest is available (ie only, where xhr might not work
  		// cross domain), use the page location. Otherwise use example.com
  		// Note: this doesn't actually make an http request.
  		try {
  			xhr.open('GET', global.XDomainRequest ? '/' : 'https://example.com')
  		} catch(e) {
  			xhr = null
  		}
  	} else {
  		// Service workers don't have XHR
  		xhr = null
  	}
  	return xhr
  }
  
  function checkTypeSupport (type) {
  	var xhr = getXHR()
  	if (!xhr) return false
  	try {
  		xhr.responseType = type
  		return xhr.responseType === type
  	} catch (e) {}
  	return false
  }
  
  // For some strange reason, Safari 7.0 reports typeof global.ArrayBuffer === 'object'.
  // Safari 7.1 appears to have fixed this bug.
  var haveArrayBuffer = typeof global.ArrayBuffer !== 'undefined'
  var haveSlice = haveArrayBuffer && isFunction(global.ArrayBuffer.prototype.slice)
  
  // If fetch is supported, then arraybuffer will be supported too. Skip calling
  // checkTypeSupport(), since that calls getXHR().
  exports.arraybuffer = exports.fetch || (haveArrayBuffer && checkTypeSupport('arraybuffer'))
  
  // These next two tests unavoidably show warnings in Chrome. Since fetch will always
  // be used if it's available, just return false for these to avoid the warnings.
  exports.msstream = !exports.fetch && haveSlice && checkTypeSupport('ms-stream')
  exports.mozchunkedarraybuffer = !exports.fetch && haveArrayBuffer &&
  	checkTypeSupport('moz-chunked-arraybuffer')
  
  // If fetch is supported, then overrideMimeType will be supported too. Skip calling
  // getXHR().
  exports.overrideMimeType = exports.fetch || (getXHR() ? isFunction(getXHR().overrideMimeType) : false)
  
  exports.vbArray = isFunction(global.VBArray)
  
  function isFunction (value) {
  	return typeof value === 'function'
  }
  
  xhr = null // Help gc
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],32:[function(require,module,exports){
  (function (process,global,Buffer){
  var capability = require('./capability')
  var inherits = require('inherits')
  var response = require('./response')
  var stream = require('readable-stream')
  var toArrayBuffer = require('to-arraybuffer')
  
  var IncomingMessage = response.IncomingMessage
  var rStates = response.readyStates
  
  function decideMode (preferBinary, useFetch) {
  	if (capability.fetch && useFetch) {
  		return 'fetch'
  	} else if (capability.mozchunkedarraybuffer) {
  		return 'moz-chunked-arraybuffer'
  	} else if (capability.msstream) {
  		return 'ms-stream'
  	} else if (capability.arraybuffer && preferBinary) {
  		return 'arraybuffer'
  	} else if (capability.vbArray && preferBinary) {
  		return 'text:vbarray'
  	} else {
  		return 'text'
  	}
  }
  
  var ClientRequest = module.exports = function (opts) {
  	var self = this
  	stream.Writable.call(self)
  
  	self._opts = opts
  	self._body = []
  	self._headers = {}
  	if (opts.auth)
  		self.setHeader('Authorization', 'Basic ' + new Buffer(opts.auth).toString('base64'))
  	Object.keys(opts.headers).forEach(function (name) {
  		self.setHeader(name, opts.headers[name])
  	})
  
  	var preferBinary
  	var useFetch = true
  	if (opts.mode === 'disable-fetch' || ('requestTimeout' in opts && !capability.abortController)) {
  		// If the use of XHR should be preferred. Not typically needed.
  		useFetch = false
  		preferBinary = true
  	} else if (opts.mode === 'prefer-streaming') {
  		// If streaming is a high priority but binary compatibility and
  		// the accuracy of the 'content-type' header aren't
  		preferBinary = false
  	} else if (opts.mode === 'allow-wrong-content-type') {
  		// If streaming is more important than preserving the 'content-type' header
  		preferBinary = !capability.overrideMimeType
  	} else if (!opts.mode || opts.mode === 'default' || opts.mode === 'prefer-fast') {
  		// Use binary if text streaming may corrupt data or the content-type header, or for speed
  		preferBinary = true
  	} else {
  		throw new Error('Invalid value for opts.mode')
  	}
  	self._mode = decideMode(preferBinary, useFetch)
  
  	self.on('finish', function () {
  		self._onFinish()
  	})
  }
  
  inherits(ClientRequest, stream.Writable)
  
  ClientRequest.prototype.setHeader = function (name, value) {
  	var self = this
  	var lowerName = name.toLowerCase()
  	// This check is not necessary, but it prevents warnings from browsers about setting unsafe
  	// headers. To be honest I'm not entirely sure hiding these warnings is a good thing, but
  	// http-browserify did it, so I will too.
  	if (unsafeHeaders.indexOf(lowerName) !== -1)
  		return
  
  	self._headers[lowerName] = {
  		name: name,
  		value: value
  	}
  }
  
  ClientRequest.prototype.getHeader = function (name) {
  	var header = this._headers[name.toLowerCase()]
  	if (header)
  		return header.value
  	return null
  }
  
  ClientRequest.prototype.removeHeader = function (name) {
  	var self = this
  	delete self._headers[name.toLowerCase()]
  }
  
  ClientRequest.prototype._onFinish = function () {
  	var self = this
  
  	if (self._destroyed)
  		return
  	var opts = self._opts
  
  	var headersObj = self._headers
  	var body = null
  	if (opts.method !== 'GET' && opts.method !== 'HEAD') {
  		if (capability.arraybuffer) {
  			body = toArrayBuffer(Buffer.concat(self._body))
  		} else if (capability.blobConstructor) {
  			body = new global.Blob(self._body.map(function (buffer) {
  				return toArrayBuffer(buffer)
  			}), {
  				type: (headersObj['content-type'] || {}).value || ''
  			})
  		} else {
  			// get utf8 string
  			body = Buffer.concat(self._body).toString()
  		}
  	}
  
  	// create flattened list of headers
  	var headersList = []
  	Object.keys(headersObj).forEach(function (keyName) {
  		var name = headersObj[keyName].name
  		var value = headersObj[keyName].value
  		if (Array.isArray(value)) {
  			value.forEach(function (v) {
  				headersList.push([name, v])
  			})
  		} else {
  			headersList.push([name, value])
  		}
  	})
  
  	if (self._mode === 'fetch') {
  		var signal = null
  		if (capability.abortController) {
  			var controller = new AbortController()
  			signal = controller.signal
  			self._fetchAbortController = controller
  
  			if ('requestTimeout' in opts && opts.requestTimeout !== 0) {
  				global.setTimeout(function () {
  					self.emit('requestTimeout')
  					if (self._fetchAbortController)
  						self._fetchAbortController.abort()
  				}, opts.requestTimeout)
  			}
  		}
  
  		global.fetch(self._opts.url, {
  			method: self._opts.method,
  			headers: headersList,
  			body: body || undefined,
  			mode: 'cors',
  			credentials: opts.withCredentials ? 'include' : 'same-origin',
  			signal: signal
  		}).then(function (response) {
  			self._fetchResponse = response
  			self._connect()
  		}, function (reason) {
  			self.emit('error', reason)
  		})
  	} else {
  		var xhr = self._xhr = new global.XMLHttpRequest()
  		try {
  			xhr.open(self._opts.method, self._opts.url, true)
  		} catch (err) {
  			process.nextTick(function () {
  				self.emit('error', err)
  			})
  			return
  		}
  
  		// Can't set responseType on really old browsers
  		if ('responseType' in xhr)
  			xhr.responseType = self._mode.split(':')[0]
  
  		if ('withCredentials' in xhr)
  			xhr.withCredentials = !!opts.withCredentials
  
  		if (self._mode === 'text' && 'overrideMimeType' in xhr)
  			xhr.overrideMimeType('text/plain; charset=x-user-defined')
  
  		if ('requestTimeout' in opts) {
  			xhr.timeout = opts.requestTimeout
  			xhr.ontimeout = function () {
  				self.emit('requestTimeout')
  			}
  		}
  
  		headersList.forEach(function (header) {
  			xhr.setRequestHeader(header[0], header[1])
  		})
  
  		self._response = null
  		xhr.onreadystatechange = function () {
  			switch (xhr.readyState) {
  				case rStates.LOADING:
  				case rStates.DONE:
  					self._onXHRProgress()
  					break
  			}
  		}
  		// Necessary for streaming in Firefox, since xhr.response is ONLY defined
  		// in onprogress, not in onreadystatechange with xhr.readyState = 3
  		if (self._mode === 'moz-chunked-arraybuffer') {
  			xhr.onprogress = function () {
  				self._onXHRProgress()
  			}
  		}
  
  		xhr.onerror = function () {
  			if (self._destroyed)
  				return
  			self.emit('error', new Error('XHR error'))
  		}
  
  		try {
  			xhr.send(body)
  		} catch (err) {
  			process.nextTick(function () {
  				self.emit('error', err)
  			})
  			return
  		}
  	}
  }
  
  /**
   * Checks if xhr.status is readable and non-zero, indicating no error.
   * Even though the spec says it should be available in readyState 3,
   * accessing it throws an exception in IE8
   */
  function statusValid (xhr) {
  	try {
  		var status = xhr.status
  		return (status !== null && status !== 0)
  	} catch (e) {
  		return false
  	}
  }
  
  ClientRequest.prototype._onXHRProgress = function () {
  	var self = this
  
  	if (!statusValid(self._xhr) || self._destroyed)
  		return
  
  	if (!self._response)
  		self._connect()
  
  	self._response._onXHRProgress()
  }
  
  ClientRequest.prototype._connect = function () {
  	var self = this
  
  	if (self._destroyed)
  		return
  
  	self._response = new IncomingMessage(self._xhr, self._fetchResponse, self._mode)
  	self._response.on('error', function(err) {
  		self.emit('error', err)
  	})
  
  	self.emit('response', self._response)
  }
  
  ClientRequest.prototype._write = function (chunk, encoding, cb) {
  	var self = this
  
  	self._body.push(chunk)
  	cb()
  }
  
  ClientRequest.prototype.abort = ClientRequest.prototype.destroy = function () {
  	var self = this
  	self._destroyed = true
  	if (self._response)
  		self._response._destroyed = true
  	if (self._xhr)
  		self._xhr.abort()
  	else if (self._fetchAbortController)
  		self._fetchAbortController.abort()
  }
  
  ClientRequest.prototype.end = function (data, encoding, cb) {
  	var self = this
  	if (typeof data === 'function') {
  		cb = data
  		data = undefined
  	}
  
  	stream.Writable.prototype.end.call(self, data, encoding, cb)
  }
  
  ClientRequest.prototype.flushHeaders = function () {}
  ClientRequest.prototype.setTimeout = function () {}
  ClientRequest.prototype.setNoDelay = function () {}
  ClientRequest.prototype.setSocketKeepAlive = function () {}
  
  // Taken from http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader%28%29-method
  var unsafeHeaders = [
  	'accept-charset',
  	'accept-encoding',
  	'access-control-request-headers',
  	'access-control-request-method',
  	'connection',
  	'content-length',
  	'cookie',
  	'cookie2',
  	'date',
  	'dnt',
  	'expect',
  	'host',
  	'keep-alive',
  	'origin',
  	'referer',
  	'te',
  	'trailer',
  	'transfer-encoding',
  	'upgrade',
  	'user-agent',
  	'via'
  ]
  
  }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
  },{"./capability":31,"./response":33,"_process":14,"buffer":4,"inherits":10,"readable-stream":28,"to-arraybuffer":34}],33:[function(require,module,exports){
  (function (process,global,Buffer){
  var capability = require('./capability')
  var inherits = require('inherits')
  var stream = require('readable-stream')
  
  var rStates = exports.readyStates = {
  	UNSENT: 0,
  	OPENED: 1,
  	HEADERS_RECEIVED: 2,
  	LOADING: 3,
  	DONE: 4
  }
  
  var IncomingMessage = exports.IncomingMessage = function (xhr, response, mode) {
  	var self = this
  	stream.Readable.call(self)
  
  	self._mode = mode
  	self.headers = {}
  	self.rawHeaders = []
  	self.trailers = {}
  	self.rawTrailers = []
  
  	// Fake the 'close' event, but only once 'end' fires
  	self.on('end', function () {
  		// The nextTick is necessary to prevent the 'request' module from causing an infinite loop
  		process.nextTick(function () {
  			self.emit('close')
  		})
  	})
  
  	if (mode === 'fetch') {
  		self._fetchResponse = response
  
  		self.url = response.url
  		self.statusCode = response.status
  		self.statusMessage = response.statusText
  		
  		response.headers.forEach(function (header, key){
  			self.headers[key.toLowerCase()] = header
  			self.rawHeaders.push(key, header)
  		})
  
  		if (capability.writableStream) {
  			var writable = new WritableStream({
  				write: function (chunk) {
  					return new Promise(function (resolve, reject) {
  						if (self._destroyed) {
  							return
  						} else if(self.push(new Buffer(chunk))) {
  							resolve()
  						} else {
  							self._resumeFetch = resolve
  						}
  					})
  				},
  				close: function () {
  					if (!self._destroyed)
  						self.push(null)
  				},
  				abort: function (err) {
  					if (!self._destroyed)
  						self.emit('error', err)
  				}
  			})
  
  			try {
  				response.body.pipeTo(writable)
  				return
  			} catch (e) {} // pipeTo method isn't defined. Can't find a better way to feature test this
  		}
  		// fallback for when writableStream or pipeTo aren't available
  		var reader = response.body.getReader()
  		function read () {
  			reader.read().then(function (result) {
  				if (self._destroyed)
  					return
  				if (result.done) {
  					self.push(null)
  					return
  				}
  				self.push(new Buffer(result.value))
  				read()
  			}).catch(function(err) {
  				if (!self._destroyed)
  					self.emit('error', err)
  			})
  		}
  		read()
  	} else {
  		self._xhr = xhr
  		self._pos = 0
  
  		self.url = xhr.responseURL
  		self.statusCode = xhr.status
  		self.statusMessage = xhr.statusText
  		var headers = xhr.getAllResponseHeaders().split(/\r?\n/)
  		headers.forEach(function (header) {
  			var matches = header.match(/^([^:]+):\s*(.*)/)
  			if (matches) {
  				var key = matches[1].toLowerCase()
  				if (key === 'set-cookie') {
  					if (self.headers[key] === undefined) {
  						self.headers[key] = []
  					}
  					self.headers[key].push(matches[2])
  				} else if (self.headers[key] !== undefined) {
  					self.headers[key] += ', ' + matches[2]
  				} else {
  					self.headers[key] = matches[2]
  				}
  				self.rawHeaders.push(matches[1], matches[2])
  			}
  		})
  
  		self._charset = 'x-user-defined'
  		if (!capability.overrideMimeType) {
  			var mimeType = self.rawHeaders['mime-type']
  			if (mimeType) {
  				var charsetMatch = mimeType.match(/;\s*charset=([^;])(;|$)/)
  				if (charsetMatch) {
  					self._charset = charsetMatch[1].toLowerCase()
  				}
  			}
  			if (!self._charset)
  				self._charset = 'utf-8' // best guess
  		}
  	}
  }
  
  inherits(IncomingMessage, stream.Readable)
  
  IncomingMessage.prototype._read = function () {
  	var self = this
  
  	var resolve = self._resumeFetch
  	if (resolve) {
  		self._resumeFetch = null
  		resolve()
  	}
  }
  
  IncomingMessage.prototype._onXHRProgress = function () {
  	var self = this
  
  	var xhr = self._xhr
  
  	var response = null
  	switch (self._mode) {
  		case 'text:vbarray': // For IE9
  			if (xhr.readyState !== rStates.DONE)
  				break
  			try {
  				// This fails in IE8
  				response = new global.VBArray(xhr.responseBody).toArray()
  			} catch (e) {}
  			if (response !== null) {
  				self.push(new Buffer(response))
  				break
  			}
  			// Falls through in IE8	
  		case 'text':
  			try { // This will fail when readyState = 3 in IE9. Switch mode and wait for readyState = 4
  				response = xhr.responseText
  			} catch (e) {
  				self._mode = 'text:vbarray'
  				break
  			}
  			if (response.length > self._pos) {
  				var newData = response.substr(self._pos)
  				if (self._charset === 'x-user-defined') {
  					var buffer = new Buffer(newData.length)
  					for (var i = 0; i < newData.length; i++)
  						buffer[i] = newData.charCodeAt(i) & 0xff
  
  					self.push(buffer)
  				} else {
  					self.push(newData, self._charset)
  				}
  				self._pos = response.length
  			}
  			break
  		case 'arraybuffer':
  			if (xhr.readyState !== rStates.DONE || !xhr.response)
  				break
  			response = xhr.response
  			self.push(new Buffer(new Uint8Array(response)))
  			break
  		case 'moz-chunked-arraybuffer': // take whole
  			response = xhr.response
  			if (xhr.readyState !== rStates.LOADING || !response)
  				break
  			self.push(new Buffer(new Uint8Array(response)))
  			break
  		case 'ms-stream':
  			response = xhr.response
  			if (xhr.readyState !== rStates.LOADING)
  				break
  			var reader = new global.MSStreamReader()
  			reader.onprogress = function () {
  				if (reader.result.byteLength > self._pos) {
  					self.push(new Buffer(new Uint8Array(reader.result.slice(self._pos))))
  					self._pos = reader.result.byteLength
  				}
  			}
  			reader.onload = function () {
  				self.push(null)
  			}
  			// reader.onerror = ??? // TODO: this
  			reader.readAsArrayBuffer(response)
  			break
  	}
  
  	// The ms-stream case handles end separately in reader.onload()
  	if (self._xhr.readyState === rStates.DONE && self._mode !== 'ms-stream') {
  		self.push(null)
  	}
  }
  
  }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
  },{"./capability":31,"_process":14,"buffer":4,"inherits":10,"readable-stream":28}],34:[function(require,module,exports){
  var Buffer = require('buffer').Buffer
  
  module.exports = function (buf) {
  	// If the buffer is backed by a Uint8Array, a faster version will work
  	if (buf instanceof Uint8Array) {
  		// If the buffer isn't a subarray, return the underlying ArrayBuffer
  		if (buf.byteOffset === 0 && buf.byteLength === buf.buffer.byteLength) {
  			return buf.buffer
  		} else if (typeof buf.buffer.slice === 'function') {
  			// Otherwise we need to get a proper copy
  			return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength)
  		}
  	}
  
  	if (Buffer.isBuffer(buf)) {
  		// This is the slow version that will work with any Buffer
  		// implementation (even in old browsers)
  		var arrayCopy = new Uint8Array(buf.length)
  		var len = buf.length
  		for (var i = 0; i < len; i++) {
  			arrayCopy[i] = buf[i]
  		}
  		return arrayCopy.buffer
  	} else {
  		throw new Error('Argument must be a Buffer')
  	}
  }
  
  },{"buffer":4}],35:[function(require,module,exports){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  
  var punycode = require('punycode');
  var util = require('./util');
  
  exports.parse = urlParse;
  exports.resolve = urlResolve;
  exports.resolveObject = urlResolveObject;
  exports.format = urlFormat;
  
  exports.Url = Url;
  
  function Url() {
    this.protocol = null;
    this.slashes = null;
    this.auth = null;
    this.host = null;
    this.port = null;
    this.hostname = null;
    this.hash = null;
    this.search = null;
    this.query = null;
    this.pathname = null;
    this.path = null;
    this.href = null;
  }
  
  // Reference: RFC 3986, RFC 1808, RFC 2396
  
  // define these here so at least they only have to be
  // compiled once on the first module load.
  var protocolPattern = /^([a-z0-9.+-]+:)/i,
      portPattern = /:[0-9]*$/,
  
      // Special case for a simple path URL
      simplePathPattern = /^(\/\/?(?!\/)[^\?\s]*)(\?[^\s]*)?$/,
  
      // RFC 2396: characters reserved for delimiting URLs.
      // We actually just auto-escape these.
      delims = ['<', '>', '"', '`', ' ', '\r', '\n', '\t'],
  
      // RFC 2396: characters not allowed for various reasons.
      unwise = ['{', '}', '|', '\\', '^', '`'].concat(delims),
  
      // Allowed by RFCs, but cause of XSS attacks.  Always escape these.
      autoEscape = ['\''].concat(unwise),
      // Characters that are never ever allowed in a hostname.
      // Note that any invalid chars are also handled, but these
      // are the ones that are *expected* to be seen, so we fast-path
      // them.
      nonHostChars = ['%', '/', '?', ';', '#'].concat(autoEscape),
      hostEndingChars = ['/', '?', '#'],
      hostnameMaxLen = 255,
      hostnamePartPattern = /^[+a-z0-9A-Z_-]{0,63}$/,
      hostnamePartStart = /^([+a-z0-9A-Z_-]{0,63})(.*)$/,
      // protocols that can allow "unsafe" and "unwise" chars.
      unsafeProtocol = {
        'javascript': true,
        'javascript:': true
      },
      // protocols that never have a hostname.
      hostlessProtocol = {
        'javascript': true,
        'javascript:': true
      },
      // protocols that always contain a // bit.
      slashedProtocol = {
        'http': true,
        'https': true,
        'ftp': true,
        'gopher': true,
        'file': true,
        'http:': true,
        'https:': true,
        'ftp:': true,
        'gopher:': true,
        'file:': true
      },
      querystring = require('querystring');
  
  function urlParse(url, parseQueryString, slashesDenoteHost) {
    if (url && util.isObject(url) && url instanceof Url) return url;
  
    var u = new Url;
    u.parse(url, parseQueryString, slashesDenoteHost);
    return u;
  }
  
  Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
    if (!util.isString(url)) {
      throw new TypeError("Parameter 'url' must be a string, not " + typeof url);
    }
  
    // Copy chrome, IE, opera backslash-handling behavior.
    // Back slashes before the query string get converted to forward slashes
    // See: https://code.google.com/p/chromium/issues/detail?id=25916
    var queryIndex = url.indexOf('?'),
        splitter =
            (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',
        uSplit = url.split(splitter),
        slashRegex = /\\/g;
    uSplit[0] = uSplit[0].replace(slashRegex, '/');
    url = uSplit.join(splitter);
  
    var rest = url;
  
    // trim before proceeding.
    // This is to support parse stuff like "  http://foo.com  \n"
    rest = rest.trim();
  
    if (!slashesDenoteHost && url.split('#').length === 1) {
      // Try fast path regexp
      var simplePath = simplePathPattern.exec(rest);
      if (simplePath) {
        this.path = rest;
        this.href = rest;
        this.pathname = simplePath[1];
        if (simplePath[2]) {
          this.search = simplePath[2];
          if (parseQueryString) {
            this.query = querystring.parse(this.search.substr(1));
          } else {
            this.query = this.search.substr(1);
          }
        } else if (parseQueryString) {
          this.search = '';
          this.query = {};
        }
        return this;
      }
    }
  
    var proto = protocolPattern.exec(rest);
    if (proto) {
      proto = proto[0];
      var lowerProto = proto.toLowerCase();
      this.protocol = lowerProto;
      rest = rest.substr(proto.length);
    }
  
    // figure out if it's got a host
    // user@server is *always* interpreted as a hostname, and url
    // resolution will treat //foo/bar as host=foo,path=bar because that's
    // how the browser resolves relative URLs.
    if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
      var slashes = rest.substr(0, 2) === '//';
      if (slashes && !(proto && hostlessProtocol[proto])) {
        rest = rest.substr(2);
        this.slashes = true;
      }
    }
  
    if (!hostlessProtocol[proto] &&
        (slashes || (proto && !slashedProtocol[proto]))) {
  
      // there's a hostname.
      // the first instance of /, ?, ;, or # ends the host.
      //
      // If there is an @ in the hostname, then non-host chars *are* allowed
      // to the left of the last @ sign, unless some host-ending character
      // comes *before* the @-sign.
      // URLs are obnoxious.
      //
      // ex:
      // http://a@b@c/ => user:a@b host:c
      // http://a@b?@c => user:a host:c path:/?@c
  
      // v0.12 TODO(isaacs): This is not quite how Chrome does things.
      // Review our test case against browsers more comprehensively.
  
      // find the first instance of any hostEndingChars
      var hostEnd = -1;
      for (var i = 0; i < hostEndingChars.length; i++) {
        var hec = rest.indexOf(hostEndingChars[i]);
        if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
          hostEnd = hec;
      }
  
      // at this point, either we have an explicit point where the
      // auth portion cannot go past, or the last @ char is the decider.
      var auth, atSign;
      if (hostEnd === -1) {
        // atSign can be anywhere.
        atSign = rest.lastIndexOf('@');
      } else {
        // atSign must be in auth portion.
        // http://a@b/c@d => host:b auth:a path:/c@d
        atSign = rest.lastIndexOf('@', hostEnd);
      }
  
      // Now we have a portion which is definitely the auth.
      // Pull that off.
      if (atSign !== -1) {
        auth = rest.slice(0, atSign);
        rest = rest.slice(atSign + 1);
        this.auth = decodeURIComponent(auth);
      }
  
      // the host is the remaining to the left of the first non-host char
      hostEnd = -1;
      for (var i = 0; i < nonHostChars.length; i++) {
        var hec = rest.indexOf(nonHostChars[i]);
        if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
          hostEnd = hec;
      }
      // if we still have not hit it, then the entire thing is a host.
      if (hostEnd === -1)
        hostEnd = rest.length;
  
      this.host = rest.slice(0, hostEnd);
      rest = rest.slice(hostEnd);
  
      // pull out port.
      this.parseHost();
  
      // we've indicated that there is a hostname,
      // so even if it's empty, it has to be present.
      this.hostname = this.hostname || '';
  
      // if hostname begins with [ and ends with ]
      // assume that it's an IPv6 address.
      var ipv6Hostname = this.hostname[0] === '[' &&
          this.hostname[this.hostname.length - 1] === ']';
  
      // validate a little.
      if (!ipv6Hostname) {
        var hostparts = this.hostname.split(/\./);
        for (var i = 0, l = hostparts.length; i < l; i++) {
          var part = hostparts[i];
          if (!part) continue;
          if (!part.match(hostnamePartPattern)) {
            var newpart = '';
            for (var j = 0, k = part.length; j < k; j++) {
              if (part.charCodeAt(j) > 127) {
                // we replace non-ASCII char with a temporary placeholder
                // we need this to make sure size of hostname is not
                // broken by replacing non-ASCII by nothing
                newpart += 'x';
              } else {
                newpart += part[j];
              }
            }
            // we test again with ASCII char only
            if (!newpart.match(hostnamePartPattern)) {
              var validParts = hostparts.slice(0, i);
              var notHost = hostparts.slice(i + 1);
              var bit = part.match(hostnamePartStart);
              if (bit) {
                validParts.push(bit[1]);
                notHost.unshift(bit[2]);
              }
              if (notHost.length) {
                rest = '/' + notHost.join('.') + rest;
              }
              this.hostname = validParts.join('.');
              break;
            }
          }
        }
      }
  
      if (this.hostname.length > hostnameMaxLen) {
        this.hostname = '';
      } else {
        // hostnames are always lower case.
        this.hostname = this.hostname.toLowerCase();
      }
  
      if (!ipv6Hostname) {
        // IDNA Support: Returns a punycoded representation of "domain".
        // It only converts parts of the domain name that
        // have non-ASCII characters, i.e. it doesn't matter if
        // you call it with a domain that already is ASCII-only.
        this.hostname = punycode.toASCII(this.hostname);
      }
  
      var p = this.port ? ':' + this.port : '';
      var h = this.hostname || '';
      this.host = h + p;
      this.href += this.host;
  
      // strip [ and ] from the hostname
      // the host field still retains them, though
      if (ipv6Hostname) {
        this.hostname = this.hostname.substr(1, this.hostname.length - 2);
        if (rest[0] !== '/') {
          rest = '/' + rest;
        }
      }
    }
  
    // now rest is set to the post-host stuff.
    // chop off any delim chars.
    if (!unsafeProtocol[lowerProto]) {
  
      // First, make 100% sure that any "autoEscape" chars get
      // escaped, even if encodeURIComponent doesn't think they
      // need to be.
      for (var i = 0, l = autoEscape.length; i < l; i++) {
        var ae = autoEscape[i];
        if (rest.indexOf(ae) === -1)
          continue;
        var esc = encodeURIComponent(ae);
        if (esc === ae) {
          esc = escape(ae);
        }
        rest = rest.split(ae).join(esc);
      }
    }
  
  
    // chop off from the tail first.
    var hash = rest.indexOf('#');
    if (hash !== -1) {
      // got a fragment string.
      this.hash = rest.substr(hash);
      rest = rest.slice(0, hash);
    }
    var qm = rest.indexOf('?');
    if (qm !== -1) {
      this.search = rest.substr(qm);
      this.query = rest.substr(qm + 1);
      if (parseQueryString) {
        this.query = querystring.parse(this.query);
      }
      rest = rest.slice(0, qm);
    } else if (parseQueryString) {
      // no query string, but parseQueryString still requested
      this.search = '';
      this.query = {};
    }
    if (rest) this.pathname = rest;
    if (slashedProtocol[lowerProto] &&
        this.hostname && !this.pathname) {
      this.pathname = '/';
    }
  
    //to support http.request
    if (this.pathname || this.search) {
      var p = this.pathname || '';
      var s = this.search || '';
      this.path = p + s;
    }
  
    // finally, reconstruct the href based on what has been validated.
    this.href = this.format();
    return this;
  };
  
  // format a parsed object into a url string
  function urlFormat(obj) {
    // ensure it's an object, and not a string url.
    // If it's an obj, this is a no-op.
    // this way, you can call url_format() on strings
    // to clean up potentially wonky urls.
    if (util.isString(obj)) obj = urlParse(obj);
    if (!(obj instanceof Url)) return Url.prototype.format.call(obj);
    return obj.format();
  }
  
  Url.prototype.format = function() {
    var auth = this.auth || '';
    if (auth) {
      auth = encodeURIComponent(auth);
      auth = auth.replace(/%3A/i, ':');
      auth += '@';
    }
  
    var protocol = this.protocol || '',
        pathname = this.pathname || '',
        hash = this.hash || '',
        host = false,
        query = '';
  
    if (this.host) {
      host = auth + this.host;
    } else if (this.hostname) {
      host = auth + (this.hostname.indexOf(':') === -1 ?
          this.hostname :
          '[' + this.hostname + ']');
      if (this.port) {
        host += ':' + this.port;
      }
    }
  
    if (this.query &&
        util.isObject(this.query) &&
        Object.keys(this.query).length) {
      query = querystring.stringify(this.query);
    }
  
    var search = this.search || (query && ('?' + query)) || '';
  
    if (protocol && protocol.substr(-1) !== ':') protocol += ':';
  
    // only the slashedProtocols get the //.  Not mailto:, xmpp:, etc.
    // unless they had them to begin with.
    if (this.slashes ||
        (!protocol || slashedProtocol[protocol]) && host !== false) {
      host = '//' + (host || '');
      if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;
    } else if (!host) {
      host = '';
    }
  
    if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
    if (search && search.charAt(0) !== '?') search = '?' + search;
  
    pathname = pathname.replace(/[?#]/g, function(match) {
      return encodeURIComponent(match);
    });
    search = search.replace('#', '%23');
  
    return protocol + host + pathname + search + hash;
  };
  
  function urlResolve(source, relative) {
    return urlParse(source, false, true).resolve(relative);
  }
  
  Url.prototype.resolve = function(relative) {
    return this.resolveObject(urlParse(relative, false, true)).format();
  };
  
  function urlResolveObject(source, relative) {
    if (!source) return relative;
    return urlParse(source, false, true).resolveObject(relative);
  }
  
  Url.prototype.resolveObject = function(relative) {
    if (util.isString(relative)) {
      var rel = new Url();
      rel.parse(relative, false, true);
      relative = rel;
    }
  
    var result = new Url();
    var tkeys = Object.keys(this);
    for (var tk = 0; tk < tkeys.length; tk++) {
      var tkey = tkeys[tk];
      result[tkey] = this[tkey];
    }
  
    // hash is always overridden, no matter what.
    // even href="" will remove it.
    result.hash = relative.hash;
  
    // if the relative url is empty, then there's nothing left to do here.
    if (relative.href === '') {
      result.href = result.format();
      return result;
    }
  
    // hrefs like //foo/bar always cut to the protocol.
    if (relative.slashes && !relative.protocol) {
      // take everything except the protocol from relative
      var rkeys = Object.keys(relative);
      for (var rk = 0; rk < rkeys.length; rk++) {
        var rkey = rkeys[rk];
        if (rkey !== 'protocol')
          result[rkey] = relative[rkey];
      }
  
      //urlParse appends trailing / to urls like http://www.example.com
      if (slashedProtocol[result.protocol] &&
          result.hostname && !result.pathname) {
        result.path = result.pathname = '/';
      }
  
      result.href = result.format();
      return result;
    }
  
    if (relative.protocol && relative.protocol !== result.protocol) {
      // if it's a known url protocol, then changing
      // the protocol does weird things
      // first, if it's not file:, then we MUST have a host,
      // and if there was a path
      // to begin with, then we MUST have a path.
      // if it is file:, then the host is dropped,
      // because that's known to be hostless.
      // anything else is assumed to be absolute.
      if (!slashedProtocol[relative.protocol]) {
        var keys = Object.keys(relative);
        for (var v = 0; v < keys.length; v++) {
          var k = keys[v];
          result[k] = relative[k];
        }
        result.href = result.format();
        return result;
      }
  
      result.protocol = relative.protocol;
      if (!relative.host && !hostlessProtocol[relative.protocol]) {
        var relPath = (relative.pathname || '').split('/');
        while (relPath.length && !(relative.host = relPath.shift()));
        if (!relative.host) relative.host = '';
        if (!relative.hostname) relative.hostname = '';
        if (relPath[0] !== '') relPath.unshift('');
        if (relPath.length < 2) relPath.unshift('');
        result.pathname = relPath.join('/');
      } else {
        result.pathname = relative.pathname;
      }
      result.search = relative.search;
      result.query = relative.query;
      result.host = relative.host || '';
      result.auth = relative.auth;
      result.hostname = relative.hostname || relative.host;
      result.port = relative.port;
      // to support http.request
      if (result.pathname || result.search) {
        var p = result.pathname || '';
        var s = result.search || '';
        result.path = p + s;
      }
      result.slashes = result.slashes || relative.slashes;
      result.href = result.format();
      return result;
    }
  
    var isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/'),
        isRelAbs = (
            relative.host ||
            relative.pathname && relative.pathname.charAt(0) === '/'
        ),
        mustEndAbs = (isRelAbs || isSourceAbs ||
                      (result.host && relative.pathname)),
        removeAllDots = mustEndAbs,
        srcPath = result.pathname && result.pathname.split('/') || [],
        relPath = relative.pathname && relative.pathname.split('/') || [],
        psychotic = result.protocol && !slashedProtocol[result.protocol];
  
    // if the url is a non-slashed url, then relative
    // links like ../.. should be able
    // to crawl up to the hostname, as well.  This is strange.
    // result.protocol has already been set by now.
    // Later on, put the first path part into the host field.
    if (psychotic) {
      result.hostname = '';
      result.port = null;
      if (result.host) {
        if (srcPath[0] === '') srcPath[0] = result.host;
        else srcPath.unshift(result.host);
      }
      result.host = '';
      if (relative.protocol) {
        relative.hostname = null;
        relative.port = null;
        if (relative.host) {
          if (relPath[0] === '') relPath[0] = relative.host;
          else relPath.unshift(relative.host);
        }
        relative.host = null;
      }
      mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');
    }
  
    if (isRelAbs) {
      // it's absolute.
      result.host = (relative.host || relative.host === '') ?
                    relative.host : result.host;
      result.hostname = (relative.hostname || relative.hostname === '') ?
                        relative.hostname : result.hostname;
      result.search = relative.search;
      result.query = relative.query;
      srcPath = relPath;
      // fall through to the dot-handling below.
    } else if (relPath.length) {
      // it's relative
      // throw away the existing file, and take the new path instead.
      if (!srcPath) srcPath = [];
      srcPath.pop();
      srcPath = srcPath.concat(relPath);
      result.search = relative.search;
      result.query = relative.query;
    } else if (!util.isNullOrUndefined(relative.search)) {
      // just pull out the search.
      // like href='?foo'.
      // Put this after the other two cases because it simplifies the booleans
      if (psychotic) {
        result.hostname = result.host = srcPath.shift();
        //occationaly the auth can get stuck only in host
        //this especially happens in cases like
        //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
        var authInHost = result.host && result.host.indexOf('@') > 0 ?
                         result.host.split('@') : false;
        if (authInHost) {
          result.auth = authInHost.shift();
          result.host = result.hostname = authInHost.shift();
        }
      }
      result.search = relative.search;
      result.query = relative.query;
      //to support http.request
      if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
        result.path = (result.pathname ? result.pathname : '') +
                      (result.search ? result.search : '');
      }
      result.href = result.format();
      return result;
    }
  
    if (!srcPath.length) {
      // no path at all.  easy.
      // we've already handled the other stuff above.
      result.pathname = null;
      //to support http.request
      if (result.search) {
        result.path = '/' + result.search;
      } else {
        result.path = null;
      }
      result.href = result.format();
      return result;
    }
  
    // if a url ENDs in . or .., then it must get a trailing slash.
    // however, if it ends in anything else non-slashy,
    // then it must NOT get a trailing slash.
    var last = srcPath.slice(-1)[0];
    var hasTrailingSlash = (
        (result.host || relative.host || srcPath.length > 1) &&
        (last === '.' || last === '..') || last === '');
  
    // strip single dots, resolve double dots to parent dir
    // if the path tries to go above the root, `up` ends up > 0
    var up = 0;
    for (var i = srcPath.length; i >= 0; i--) {
      last = srcPath[i];
      if (last === '.') {
        srcPath.splice(i, 1);
      } else if (last === '..') {
        srcPath.splice(i, 1);
        up++;
      } else if (up) {
        srcPath.splice(i, 1);
        up--;
      }
    }
  
    // if the path is allowed to go above the root, restore leading ..s
    if (!mustEndAbs && !removeAllDots) {
      for (; up--; up) {
        srcPath.unshift('..');
      }
    }
  
    if (mustEndAbs && srcPath[0] !== '' &&
        (!srcPath[0] || srcPath[0].charAt(0) !== '/')) {
      srcPath.unshift('');
    }
  
    if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {
      srcPath.push('');
    }
  
    var isAbsolute = srcPath[0] === '' ||
        (srcPath[0] && srcPath[0].charAt(0) === '/');
  
    // put the host back
    if (psychotic) {
      result.hostname = result.host = isAbsolute ? '' :
                                      srcPath.length ? srcPath.shift() : '';
      //occationaly the auth can get stuck only in host
      //this especially happens in cases like
      //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
      var authInHost = result.host && result.host.indexOf('@') > 0 ?
                       result.host.split('@') : false;
      if (authInHost) {
        result.auth = authInHost.shift();
        result.host = result.hostname = authInHost.shift();
      }
    }
  
    mustEndAbs = mustEndAbs || (result.host && srcPath.length);
  
    if (mustEndAbs && !isAbsolute) {
      srcPath.unshift('');
    }
  
    if (!srcPath.length) {
      result.pathname = null;
      result.path = null;
    } else {
      result.pathname = srcPath.join('/');
    }
  
    //to support request.http
    if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
      result.path = (result.pathname ? result.pathname : '') +
                    (result.search ? result.search : '');
    }
    result.auth = relative.auth || result.auth;
    result.slashes = result.slashes || relative.slashes;
    result.href = result.format();
    return result;
  };
  
  Url.prototype.parseHost = function() {
    var host = this.host;
    var port = portPattern.exec(host);
    if (port) {
      port = port[0];
      if (port !== ':') {
        this.port = port.substr(1);
      }
      host = host.substr(0, host.length - port.length);
    }
    if (host) this.hostname = host;
  };
  
  },{"./util":36,"punycode":15,"querystring":18}],36:[function(require,module,exports){
  'use strict';
  
  module.exports = {
    isString: function(arg) {
      return typeof(arg) === 'string';
    },
    isObject: function(arg) {
      return typeof(arg) === 'object' && arg !== null;
    },
    isNull: function(arg) {
      return arg === null;
    },
    isNullOrUndefined: function(arg) {
      return arg == null;
    }
  };
  
  },{}],37:[function(require,module,exports){
  (function (global){
  
  /**
   * Module exports.
   */
  
  module.exports = deprecate;
  
  /**
   * Mark that a method should not be used.
   * Returns a modified function which warns once by default.
   *
   * If `localStorage.noDeprecation = true` is set, then it is a no-op.
   *
   * If `localStorage.throwDeprecation = true` is set, then deprecated functions
   * will throw an Error when invoked.
   *
   * If `localStorage.traceDeprecation = true` is set, then deprecated functions
   * will invoke `console.trace()` instead of `console.error()`.
   *
   * @param {Function} fn - the function to deprecate
   * @param {String} msg - the string to print to the console when `fn` is invoked
   * @returns {Function} a new "deprecated" version of `fn`
   * @api public
   */
  
  function deprecate (fn, msg) {
    if (config('noDeprecation')) {
      return fn;
    }
  
    var warned = false;
    function deprecated() {
      if (!warned) {
        if (config('throwDeprecation')) {
          throw new Error(msg);
        } else if (config('traceDeprecation')) {
          console.trace(msg);
        } else {
          console.warn(msg);
        }
        warned = true;
      }
      return fn.apply(this, arguments);
    }
  
    return deprecated;
  }
  
  /**
   * Checks `localStorage` for boolean values for the given `name`.
   *
   * @param {String} name
   * @returns {Boolean}
   * @api private
   */
  
  function config (name) {
    // accessing global.localStorage can trigger a DOMException in sandboxed iframes
    try {
      if (!global.localStorage) return false;
    } catch (_) {
      return false;
    }
    var val = global.localStorage[name];
    if (null == val) return false;
    return String(val).toLowerCase() === 'true';
  }
  
  }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{}],38:[function(require,module,exports){
  module.exports = extend
  
  var hasOwnProperty = Object.prototype.hasOwnProperty;
  
  function extend() {
      var target = {}
  
      for (var i = 0; i < arguments.length; i++) {
          var source = arguments[i]
  
          for (var key in source) {
              if (hasOwnProperty.call(source, key)) {
                  target[key] = source[key]
              }
          }
      }
  
      return target
  }
  
  },{}]},{},[1])(1)
  });