text: 'use strict';
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  
  var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
  
  var _react = require('react');
  
  var _react2 = _interopRequireDefault(_react);
  
  var _propTypes = require('prop-types');
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
  
  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
  
  var Script = function (_React$Component) {
    _inherits(Script, _React$Component);
  
    // A dictionary mapping script URL to a boolean value indicating if the script
    // has failed to load.
  
  
    // A dictionary mapping script URLs to a dictionary mapping
    // component key to component for all components that are waiting
    // for the script to load.
    function Script(props) {
      _classCallCheck(this, Script);
  
      var _this = _possibleConstructorReturn(this, (Script.__proto__ || Object.getPrototypeOf(Script)).call(this, props));
  
      _this.scriptLoaderId = 'id' + _this.constructor.idCount++; // eslint-disable-line space-unary-ops, no-plusplus
      return _this;
    }
  
    // A counter used to generate a unique id for each component that uses
    // ScriptLoaderMixin.
  
  
    // A dictionary mapping script URL to a boolean value indicating if the script
    // has already been loaded.
  
  
    _createClass(Script, [{
      key: 'componentDidMount',
      value: function componentDidMount() {
        var _props = this.props,
            onError = _props.onError,
            onLoad = _props.onLoad,
            url = _props.url;
  
  
        if (this.constructor.loadedScripts[url]) {
          onLoad();
          return;
        }
  
        if (this.constructor.erroredScripts[url]) {
          onError();
          return;
        }
  
        // If the script is loading, add the component to the script's observers
        // and return. Otherwise, initialize the script's observers with the component
        // and start loading the script.
        if (this.constructor.scriptObservers[url]) {
          this.constructor.scriptObservers[url][this.scriptLoaderId] = this.props;
          return;
        }
  
        this.constructor.scriptObservers[url] = _defineProperty({}, this.scriptLoaderId, this.props);
  
        this.createScript();
      }
    }, {
      key: 'componentWillUnmount',
      value: function componentWillUnmount() {
        var url = this.props.url;
  
        var observers = this.constructor.scriptObservers[url];
  
        // If the component is waiting for the script to load, remove the
        // component from the script's observers before unmounting the component.
        if (observers) {
          delete observers[this.scriptLoaderId];
        }
        this.constructor.scriptObservers = {};
        this.constructor.loadedScripts = {};
      }
    }, {
      key: 'createScript',
      value: function createScript() {
        var _this2 = this;
  
        var _props2 = this.props,
            onCreate = _props2.onCreate,
            url = _props2.url,
            attributes = _props2.attributes;
  
        var script = document.createElement('script');
  
        onCreate();
  
        // add 'data-' or non standard attributes to the script tag
        if (attributes) {
          Object.keys(attributes).forEach(function (prop) {
            return script.setAttribute(prop, attributes[prop]);
          });
        }
  
        script.src = url;
  
        // default async to true if not set with custom attributes
        if (!script.hasAttribute('async')) {
          script.async = 1;
        }
  
        var callObserverFuncAndRemoveObserver = function callObserverFuncAndRemoveObserver(shouldRemoveObserver) {
          var observers = _this2.constructor.scriptObservers[url];
          Object.keys(observers).forEach(function (key) {
            if (shouldRemoveObserver(observers[key])) {
              delete _this2.constructor.scriptObservers[url][_this2.scriptLoaderId];
            }
          });
        };
        script.onload = function () {
          _this2.constructor.loadedScripts[url] = true;
          callObserverFuncAndRemoveObserver(function (observer) {
            observer.onLoad();
            return true;
          });
        };
  
        script.onerror = function () {
          _this2.constructor.erroredScripts[url] = true;
          callObserverFuncAndRemoveObserver(function (observer) {
            observer.onError();
            return true;
          });
        };
  
        document.body.appendChild(script);
      }
    }, {
      key: 'render',
      value: function render() {
        return null;
      }
    }]);
  
    return Script;
  }(_react2.default.Component);
  
  Script.propTypes = {
    attributes: _propTypes.PropTypes.object, // eslint-disable-line react/forbid-prop-types
    onCreate: _propTypes.PropTypes.func,
    onError: _propTypes.PropTypes.func.isRequired,
    onLoad: _propTypes.PropTypes.func.isRequired,
    url: _propTypes.PropTypes.string.isRequired
  };
  Script.defaultProps = {
    attributes: {},
    onCreate: function onCreate() {},
    onError: function onError() {},
    onLoad: function onLoad() {} };
  Script.scriptObservers = {};
  Script.loadedScripts = {};
  Script.erroredScripts = {};
  Script.idCount = 0;
  exports.default = Script;
  module.exports = exports['default'];