text: (function (global, factory) {
  	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  	typeof define === 'function' && define.amd ? define(factory) :
  	(global['vue-scrollto'] = factory());
  }(this, (function () { 'use strict';
  
  /**
   * https://github.com/gre/bezier-easing
   * BezierEasing - use bezier curve for transition easing function
   * by Gaëtan Renaudeau 2014 - 2015 – MIT License
   */
  
  // These values are established by empiricism with tests (tradeoff: performance VS precision)
  var NEWTON_ITERATIONS = 4;
  var NEWTON_MIN_SLOPE = 0.001;
  var SUBDIVISION_PRECISION = 0.0000001;
  var SUBDIVISION_MAX_ITERATIONS = 10;
  
  var kSplineTableSize = 11;
  var kSampleStepSize = 1.0 / (kSplineTableSize - 1.0);
  
  var float32ArraySupported = typeof Float32Array === 'function';
  
  function A (aA1, aA2) { return 1.0 - 3.0 * aA2 + 3.0 * aA1; }
  function B (aA1, aA2) { return 3.0 * aA2 - 6.0 * aA1; }
  function C (aA1)      { return 3.0 * aA1; }
  
  // Returns x(t) given t, x1, and x2, or y(t) given t, y1, and y2.
  function calcBezier (aT, aA1, aA2) { return ((A(aA1, aA2) * aT + B(aA1, aA2)) * aT + C(aA1)) * aT; }
  
  // Returns dx/dt given t, x1, and x2, or dy/dt given t, y1, and y2.
  function getSlope (aT, aA1, aA2) { return 3.0 * A(aA1, aA2) * aT * aT + 2.0 * B(aA1, aA2) * aT + C(aA1); }
  
  function binarySubdivide (aX, aA, aB, mX1, mX2) {
    var currentX, currentT, i = 0;
    do {
      currentT = aA + (aB - aA) / 2.0;
      currentX = calcBezier(currentT, mX1, mX2) - aX;
      if (currentX > 0.0) {
        aB = currentT;
      } else {
        aA = currentT;
      }
    } while (Math.abs(currentX) > SUBDIVISION_PRECISION && ++i < SUBDIVISION_MAX_ITERATIONS);
    return currentT;
  }
  
  function newtonRaphsonIterate (aX, aGuessT, mX1, mX2) {
   for (var i = 0; i < NEWTON_ITERATIONS; ++i) {
     var currentSlope = getSlope(aGuessT, mX1, mX2);
     if (currentSlope === 0.0) {
       return aGuessT;
     }
     var currentX = calcBezier(aGuessT, mX1, mX2) - aX;
     aGuessT -= currentX / currentSlope;
   }
   return aGuessT;
  }
  
  var index = function bezier (mX1, mY1, mX2, mY2) {
    if (!(0 <= mX1 && mX1 <= 1 && 0 <= mX2 && mX2 <= 1)) {
      throw new Error('bezier x values must be in [0, 1] range');
    }
  
    // Precompute samples table
    var sampleValues = float32ArraySupported ? new Float32Array(kSplineTableSize) : new Array(kSplineTableSize);
    if (mX1 !== mY1 || mX2 !== mY2) {
      for (var i = 0; i < kSplineTableSize; ++i) {
        sampleValues[i] = calcBezier(i * kSampleStepSize, mX1, mX2);
      }
    }
  
    function getTForX (aX) {
      var intervalStart = 0.0;
      var currentSample = 1;
      var lastSample = kSplineTableSize - 1;
  
      for (; currentSample !== lastSample && sampleValues[currentSample] <= aX; ++currentSample) {
        intervalStart += kSampleStepSize;
      }
      --currentSample;
  
      // Interpolate to provide an initial guess for t
      var dist = (aX - sampleValues[currentSample]) / (sampleValues[currentSample + 1] - sampleValues[currentSample]);
      var guessForT = intervalStart + dist * kSampleStepSize;
  
      var initialSlope = getSlope(guessForT, mX1, mX2);
      if (initialSlope >= NEWTON_MIN_SLOPE) {
        return newtonRaphsonIterate(aX, guessForT, mX1, mX2);
      } else if (initialSlope === 0.0) {
        return guessForT;
      } else {
        return binarySubdivide(aX, intervalStart, intervalStart + kSampleStepSize, mX1, mX2);
      }
    }
  
    return function BezierEasing (x) {
      if (mX1 === mY1 && mX2 === mY2) {
        return x; // linear
      }
      // Because JavaScript number are imprecise, we should guarantee the extremes are right.
      if (x === 0) {
        return 0;
      }
      if (x === 1) {
        return 1;
      }
      return calcBezier(getTForX(x), mY1, mY2);
    };
  };
  
  var easings = {
      ease: [0.25, 0.1, 0.25, 1.0],
      linear: [0.00, 0.0, 1.00, 1.0],
      "ease-in": [0.42, 0.0, 1.00, 1.0],
      "ease-out": [0.00, 0.0, 0.58, 1.0],
      "ease-in-out": [0.42, 0.0, 0.58, 1.0]
  };
  
  // https://github.com/WICG/EventListenerOptions/blob/gh-pages/explainer.md#feature-detection
  var supportsPassive = false;
  try {
      var opts = Object.defineProperty({}, "passive", {
          get: function get() {
              supportsPassive = true;
          }
      });
      window.addEventListener("test", null, opts);
  } catch (e) {}
  
  var _ = {
      $: function $(selector) {
          if (typeof selector !== "string") {
              return selector;
          }
          return document.querySelector(selector);
      },
      on: function on(element, events, handler) {
          var opts = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : { passive: false };
  
          if (!(events instanceof Array)) {
              events = [events];
          }
          for (var i = 0; i < events.length; i++) {
              element.addEventListener(events[i], handler, supportsPassive ? opts : false);
          }
      },
      off: function off(element, events, handler) {
          if (!(events instanceof Array)) {
              events = [events];
          }
          for (var i = 0; i < events.length; i++) {
              element.removeEventListener(events[i], handler);
          }
      },
      cumulativeOffset: function cumulativeOffset(element) {
          var top = 0;
          var left = 0;
  
          do {
              top += element.offsetTop || 0;
              left += element.offsetLeft || 0;
              element = element.offsetParent;
          } while (element);
  
          return {
              top: top,
              left: left
          };
      }
  };
  
  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
    return typeof obj;
  } : function (obj) {
    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
  };
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  var _extends = Object.assign || function (target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];
  
      for (var key in source) {
        if (Object.prototype.hasOwnProperty.call(source, key)) {
          target[key] = source[key];
        }
      }
    }
  
    return target;
  };
  
  var abortEvents = ["mousedown", "wheel", "DOMMouseScroll", "mousewheel", "keyup", "touchmove"];
  
  var defaults$$1 = {
      container: "body",
      duration: 500,
      easing: "ease",
      offset: 0,
      cancelable: true,
      onStart: false,
      onDone: false,
      onCancel: false,
      x: false,
      y: true
  };
  
  function setDefaults(options) {
      defaults$$1 = _extends({}, defaults$$1, options);
  }
  
  var scroller = function scroller() {
      var element = void 0; // element to scroll to
      var container = void 0; // container to scroll
      var duration = void 0; // duration of the scrolling
      var easing = void 0; // easing to be used when scrolling
      var offset = void 0; // offset to be added (subtracted)
      var cancelable = void 0; // indicates if user can cancel the scroll or not.
      var onStart = void 0; // callback when scrolling is started
      var onDone = void 0; // callback when scrolling is done
      var onCancel = void 0; // callback when scrolling is canceled / aborted
      var x = void 0; // scroll on x axis
      var y = void 0; // scroll on y axis
  
      var initialX = void 0; // initial X of container
      var targetX = void 0; // target X of container
      var initialY = void 0; // initial Y of container
      var targetY = void 0; // target Y of container
      var diffX = void 0; // difference
      var diffY = void 0; // difference
  
      var abort = void 0; // is scrolling aborted
  
      var abortEv = void 0; // event that aborted scrolling
      var abortFn = function abortFn(e) {
          if (!cancelable) return;
          abortEv = e;
          abort = true;
      };
      var easingFn = void 0;
  
      var timeStart = void 0; // time when scrolling started
      var timeElapsed = void 0; // time elapsed since scrolling started
  
      var progress = void 0; // progress
  
      function scrollTop(container) {
          var scrollTop = container.scrollTop;
  
          if (container.tagName.toLowerCase() === "body") {
              // in firefox body.scrollTop always returns 0
              // thus if we are trying to get scrollTop on a body tag
              // we need to get it from the documentElement
              scrollTop = scrollTop || document.documentElement.scrollTop;
          }
  
          return scrollTop;
      }
  
      function scrollLeft(container) {
          var scrollLeft = container.scrollLeft;
  
          if (container.tagName.toLowerCase() === "body") {
              // in firefox body.scrollLeft always returns 0
              // thus if we are trying to get scrollLeft on a body tag
              // we need to get it from the documentElement
              scrollLeft = scrollLeft || document.documentElement.scrollLeft;
          }
  
          return scrollLeft;
      }
  
      function step(timestamp) {
          if (abort) return done();
          if (!timeStart) timeStart = timestamp;
  
          timeElapsed = timestamp - timeStart;
  
          progress = Math.min(timeElapsed / duration, 1);
          progress = easingFn(progress);
  
          topLeft(container, initialY + diffY * progress, initialX + diffX * progress);
  
          timeElapsed < duration ? window.requestAnimationFrame(step) : done();
      }
  
      function done() {
          if (!abort) topLeft(container, targetY, targetX);
          timeStart = false;
  
          _.off(container, abortEvents, abortFn);
          if (abort && onCancel) onCancel(abortEv, element);
          if (!abort && onDone) onDone(element);
      }
  
      function topLeft(element, top, left) {
          if (y) element.scrollTop = top;
          if (x) element.scrollLeft = left;
          if (element.tagName.toLowerCase() === "body") {
              // in firefox body.scrollTop doesn't scroll the page
              // thus if we are trying to scrollTop on a body tag
              // we need to scroll on the documentElement
              if (y) document.documentElement.scrollTop = top;
              if (x) document.documentElement.scrollLeft = left;
          }
      }
  
      function scrollTo(target, _duration) {
          var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  
          if ((typeof _duration === "undefined" ? "undefined" : _typeof(_duration)) === "object") {
              options = _duration;
          } else if (typeof _duration === "number") {
              options.duration = _duration;
          }
  
          if ((typeof target === "undefined" ? "undefined" : _typeof(target)) === "object") {
              // use top/left object
          } else {
              // original method
              element = _.$(target);
  
              if (!element) {
                  return console.warn("[vue-scrollto warn]: Trying to scroll to an element that is not on the page: " + target);
              }
          }
  
          container = _.$(options.container || defaults$$1.container);
          duration = options.duration || defaults$$1.duration;
          easing = options.easing || defaults$$1.easing;
          offset = options.offset || defaults$$1.offset;
          cancelable = options.hasOwnProperty("cancelable") ? options.cancelable !== false : defaults$$1.cancelable;
          onStart = options.onStart || defaults$$1.onStart;
          onDone = options.onDone || defaults$$1.onDone;
          onCancel = options.onCancel || defaults$$1.onCancel;
          x = options.x === undefined ? defaults$$1.x : options.x;
          y = options.y === undefined ? defaults$$1.y : options.y;
  
          if (!container) {
              return console.warn("[vue-scrollto warn]: Trying to scroll to an element that is not on the page: " + target);
          }
          var cumulativeOffsetContainer = _.cumulativeOffset(container);
  
          var cumulativeOffsetElement = {};
          if ((typeof target === "undefined" ? "undefined" : _typeof(target)) === "object") {
              var cumulativeOffsetElement = target;
          } else {
              var cumulativeOffsetElement = _.cumulativeOffset(element);
          }
  
          if (typeof offset === "function") {
              offset = offset();
          }
  
          initialY = scrollTop(container);
          targetY = cumulativeOffsetElement.top - cumulativeOffsetContainer.top + offset;
  
          initialX = scrollLeft(container);
          targetX = cumulativeOffsetElement.left - cumulativeOffsetContainer.left + offset;
  
          abort = false;
  
          diffY = targetY - initialY;
          diffX = targetX - initialX;
  
          if (typeof easing === "string") {
              easing = easings[easing] || easings["ease"];
          }
  
          easingFn = index.apply(index, easing);
  
          if (!diffY && !diffX) return;
          if (onStart) onStart(element);
  
          _.on(container, abortEvents, abortFn, { passive: true });
  
          window.requestAnimationFrame(step);
  
          return function () {
              abortEv = null;
              abort = true;
          };
      }
  
      return scrollTo;
  };
  
  var _scroller = scroller();
  
  var bindings = []; // store binding data
  
  function deleteBinding(el) {
      for (var i = 0; i < bindings.length; ++i) {
          if (bindings[i].el === el) {
              bindings.splice(i, 1);
              return true;
          }
      }
      return false;
  }
  
  function findBinding(el) {
      for (var i = 0; i < bindings.length; ++i) {
          if (bindings[i].el === el) {
              return bindings[i];
          }
      }
  }
  
  function getBinding(el) {
      var binding = findBinding(el);
  
      if (binding) {
          return binding;
      }
  
      bindings.push(binding = {
          el: el,
          binding: {}
      });
  
      return binding;
  }
  
  function handleClick(e) {
      e.preventDefault();
      var ctx = getBinding(this).binding;
  
      if (typeof ctx.value === "string") {
          return _scroller(ctx.value);
      }
      _scroller(ctx.value.el || ctx.value.element, ctx.value);
  }
  
  var VueScrollTo$1 = {
      bind: function bind(el, binding) {
          getBinding(el).binding = binding;
          _.on(el, "click", handleClick);
      },
      unbind: function unbind(el) {
          deleteBinding(el);
          _.off(el, "click", handleClick);
      },
      update: function update(el, binding) {
          getBinding(el).binding = binding;
      },
  
      scrollTo: _scroller,
      bindings: bindings
  };
  
  var install = function install(Vue, options) {
      if (options) setDefaults(options);
      Vue.directive("scroll-to", VueScrollTo$1);
      Vue.prototype.$scrollTo = VueScrollTo$1.scrollTo;
  };
  
  if (typeof window !== "undefined" && window.Vue) {
      window.VueScrollTo = VueScrollTo$1;
      window.VueScrollTo.setDefaults = setDefaults;
      Vue.use(install);
  }
  
  VueScrollTo$1.install = install;
  
  return VueScrollTo$1;
  
  })));
  