1#@!#!123s

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Filename : filepond-plugin-image-preview.js
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/*!
 * FilePondPluginImagePreview 4.6.11
 * Licensed under MIT, https://opensource.org/licenses/MIT/
 * Please visit https://pqina.nl/filepond/ for details.
 */

/* eslint-disable */

(function(global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined'
    ? (module.exports = factory())
    : typeof define === 'function' && define.amd
    ? define(factory)
    : ((global = global || self),
      (global.FilePondPluginImagePreview = factory()));
})(this, function() {
  'use strict';

  // test if file is of type image and can be viewed in canvas
  var isPreviewableImage = function isPreviewableImage(file) {
    return /^image/.test(file.type);
  };

  function _typeof(obj) {
    if (typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol') {
      _typeof = function(obj) {
        return typeof obj;
      };
    } else {
      _typeof = function(obj) {
        return obj &&
          typeof Symbol === 'function' &&
          obj.constructor === Symbol &&
          obj !== Symbol.prototype
          ? 'symbol'
          : typeof obj;
      };
    }

    return _typeof(obj);
  }

  var REACT_ELEMENT_TYPE;

  function _jsx(type, props, key, children) {
    if (!REACT_ELEMENT_TYPE) {
      REACT_ELEMENT_TYPE =
        (typeof Symbol === 'function' &&
          Symbol.for &&
          Symbol.for('react.element')) ||
        0xeac7;
    }

    var defaultProps = type && type.defaultProps;
    var childrenLength = arguments.length - 3;

    if (!props && childrenLength !== 0) {
      props = {
        children: void 0
      };
    }

    if (props && defaultProps) {
      for (var propName in defaultProps) {
        if (props[propName] === void 0) {
          props[propName] = defaultProps[propName];
        }
      }
    } else if (!props) {
      props = defaultProps || {};
    }

    if (childrenLength === 1) {
      props.children = children;
    } else if (childrenLength > 1) {
      var childArray = new Array(childrenLength);

      for (var i = 0; i < childrenLength; i++) {
        childArray[i] = arguments[i + 3];
      }

      props.children = childArray;
    }

    return {
      $$typeof: REACT_ELEMENT_TYPE,
      type: type,
      key: key === undefined ? null : '' + key,
      ref: null,
      props: props,
      _owner: null
    };
  }

  function _asyncIterator(iterable) {
    var method;

    if (typeof Symbol === 'function') {
      if (Symbol.asyncIterator) {
        method = iterable[Symbol.asyncIterator];
        if (method != null) return method.call(iterable);
      }

      if (Symbol.iterator) {
        method = iterable[Symbol.iterator];
        if (method != null) return method.call(iterable);
      }
    }

    throw new TypeError('Object is not async iterable');
  }

  function _AwaitValue(value) {
    this.wrapped = value;
  }

  function _AsyncGenerator(gen) {
    var front, back;

    function send(key, arg) {
      return new Promise(function(resolve, reject) {
        var request = {
          key: key,
          arg: arg,
          resolve: resolve,
          reject: reject,
          next: null
        };

        if (back) {
          back = back.next = request;
        } else {
          front = back = request;
          resume(key, arg);
        }
      });
    }

    function resume(key, arg) {
      try {
        var result = gen[key](arg);
        var value = result.value;
        var wrappedAwait = value instanceof _AwaitValue;
        Promise.resolve(wrappedAwait ? value.wrapped : value).then(
          function(arg) {
            if (wrappedAwait) {
              resume('next', arg);
              return;
            }

            settle(result.done ? 'return' : 'normal', arg);
          },
          function(err) {
            resume('throw', err);
          }
        );
      } catch (err) {
        settle('throw', err);
      }
    }

    function settle(type, value) {
      switch (type) {
        case 'return':
          front.resolve({
            value: value,
            done: true
          });
          break;

        case 'throw':
          front.reject(value);
          break;

        default:
          front.resolve({
            value: value,
            done: false
          });
          break;
      }

      front = front.next;

      if (front) {
        resume(front.key, front.arg);
      } else {
        back = null;
      }
    }

    this._invoke = send;

    if (typeof gen.return !== 'function') {
      this.return = undefined;
    }
  }

  if (typeof Symbol === 'function' && Symbol.asyncIterator) {
    _AsyncGenerator.prototype[Symbol.asyncIterator] = function() {
      return this;
    };
  }

  _AsyncGenerator.prototype.next = function(arg) {
    return this._invoke('next', arg);
  };

  _AsyncGenerator.prototype.throw = function(arg) {
    return this._invoke('throw', arg);
  };

  _AsyncGenerator.prototype.return = function(arg) {
    return this._invoke('return', arg);
  };

  function _wrapAsyncGenerator(fn) {
    return function() {
      return new _AsyncGenerator(fn.apply(this, arguments));
    };
  }

  function _awaitAsyncGenerator(value) {
    return new _AwaitValue(value);
  }

  function _asyncGeneratorDelegate(inner, awaitWrap) {
    var iter = {},
      waiting = false;

    function pump(key, value) {
      waiting = true;
      value = new Promise(function(resolve) {
        resolve(inner[key](value));
      });
      return {
        done: false,
        value: awaitWrap(value)
      };
    }

    if (typeof Symbol === 'function' && Symbol.iterator) {
      iter[Symbol.iterator] = function() {
        return this;
      };
    }

    iter.next = function(value) {
      if (waiting) {
        waiting = false;
        return value;
      }

      return pump('next', value);
    };

    if (typeof inner.throw === 'function') {
      iter.throw = function(value) {
        if (waiting) {
          waiting = false;
          throw value;
        }

        return pump('throw', value);
      };
    }

    if (typeof inner.return === 'function') {
      iter.return = function(value) {
        return pump('return', value);
      };
    }

    return iter;
  }

  function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
    try {
      var info = gen[key](arg);
      var value = info.value;
    } catch (error) {
      reject(error);
      return;
    }

    if (info.done) {
      resolve(value);
    } else {
      Promise.resolve(value).then(_next, _throw);
    }
  }

  function _asyncToGenerator(fn) {
    return function() {
      var self = this,
        args = arguments;
      return new Promise(function(resolve, reject) {
        var gen = fn.apply(self, args);

        function _next(value) {
          asyncGeneratorStep(
            gen,
            resolve,
            reject,
            _next,
            _throw,
            'next',
            value
          );
        }

        function _throw(err) {
          asyncGeneratorStep(gen, resolve, reject, _next, _throw, 'throw', err);
        }

        _next(undefined);
      });
    };
  }

  function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError('Cannot call a class as a 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);
    }
  }

  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    return Constructor;
  }

  function _defineEnumerableProperties(obj, descs) {
    for (var key in descs) {
      var desc = descs[key];
      desc.configurable = desc.enumerable = true;
      if ('value' in desc) desc.writable = true;
      Object.defineProperty(obj, key, desc);
    }

    if (Object.getOwnPropertySymbols) {
      var objectSymbols = Object.getOwnPropertySymbols(descs);

      for (var i = 0; i < objectSymbols.length; i++) {
        var sym = objectSymbols[i];
        var desc = descs[sym];
        desc.configurable = desc.enumerable = true;
        if ('value' in desc) desc.writable = true;
        Object.defineProperty(obj, sym, desc);
      }
    }

    return obj;
  }

  function _defaults(obj, defaults) {
    var keys = Object.getOwnPropertyNames(defaults);

    for (var i = 0; i < keys.length; i++) {
      var key = keys[i];
      var value = Object.getOwnPropertyDescriptor(defaults, key);

      if (value && value.configurable && obj[key] === undefined) {
        Object.defineProperty(obj, key, value);
      }
    }

    return 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 _extends() {
    _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;
      };

    return _extends.apply(this, arguments);
  }

  function _objectSpread(target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i] != null ? arguments[i] : {};
      var ownKeys = Object.keys(source);

      if (typeof Object.getOwnPropertySymbols === 'function') {
        ownKeys = ownKeys.concat(
          Object.getOwnPropertySymbols(source).filter(function(sym) {
            return Object.getOwnPropertyDescriptor(source, sym).enumerable;
          })
        );
      }

      ownKeys.forEach(function(key) {
        _defineProperty(target, key, source[key]);
      });
    }

    return target;
  }

  function _inherits(subClass, superClass) {
    if (typeof superClass !== 'function' && superClass !== null) {
      throw new TypeError('Super expression must either be null or a function');
    }

    subClass.prototype = Object.create(superClass && superClass.prototype, {
      constructor: {
        value: subClass,
        writable: true,
        configurable: true
      }
    });
    if (superClass) _setPrototypeOf(subClass, superClass);
  }

  function _inheritsLoose(subClass, superClass) {
    subClass.prototype = Object.create(superClass.prototype);
    subClass.prototype.constructor = subClass;
    subClass.__proto__ = superClass;
  }

  function _getPrototypeOf(o) {
    _getPrototypeOf = Object.setPrototypeOf
      ? Object.getPrototypeOf
      : function _getPrototypeOf(o) {
          return o.__proto__ || Object.getPrototypeOf(o);
        };
    return _getPrototypeOf(o);
  }

  function _setPrototypeOf(o, p) {
    _setPrototypeOf =
      Object.setPrototypeOf ||
      function _setPrototypeOf(o, p) {
        o.__proto__ = p;
        return o;
      };

    return _setPrototypeOf(o, p);
  }

  function isNativeReflectConstruct() {
    if (typeof Reflect === 'undefined' || !Reflect.construct) return false;
    if (Reflect.construct.sham) return false;
    if (typeof Proxy === 'function') return true;

    try {
      Date.prototype.toString.call(Reflect.construct(Date, [], function() {}));
      return true;
    } catch (e) {
      return false;
    }
  }

  function _construct(Parent, args, Class) {
    if (isNativeReflectConstruct()) {
      _construct = Reflect.construct;
    } else {
      _construct = function _construct(Parent, args, Class) {
        var a = [null];
        a.push.apply(a, args);
        var Constructor = Function.bind.apply(Parent, a);
        var instance = new Constructor();
        if (Class) _setPrototypeOf(instance, Class.prototype);
        return instance;
      };
    }

    return _construct.apply(null, arguments);
  }

  function _isNativeFunction(fn) {
    return Function.toString.call(fn).indexOf('[native code]') !== -1;
  }

  function _wrapNativeSuper(Class) {
    var _cache = typeof Map === 'function' ? new Map() : undefined;

    _wrapNativeSuper = function _wrapNativeSuper(Class) {
      if (Class === null || !_isNativeFunction(Class)) return Class;

      if (typeof Class !== 'function') {
        throw new TypeError(
          'Super expression must either be null or a function'
        );
      }

      if (typeof _cache !== 'undefined') {
        if (_cache.has(Class)) return _cache.get(Class);

        _cache.set(Class, Wrapper);
      }

      function Wrapper() {
        return _construct(Class, arguments, _getPrototypeOf(this).constructor);
      }

      Wrapper.prototype = Object.create(Class.prototype, {
        constructor: {
          value: Wrapper,
          enumerable: false,
          writable: true,
          configurable: true
        }
      });
      return _setPrototypeOf(Wrapper, Class);
    };

    return _wrapNativeSuper(Class);
  }

  function _instanceof(left, right) {
    if (
      right != null &&
      typeof Symbol !== 'undefined' &&
      right[Symbol.hasInstance]
    ) {
      return right[Symbol.hasInstance](left);
    } else {
      return left instanceof right;
    }
  }

  function _interopRequireDefault(obj) {
    return obj && obj.__esModule
      ? obj
      : {
          default: obj
        };
  }

  function _interopRequireWildcard(obj) {
    if (obj && obj.__esModule) {
      return obj;
    } else {
      var newObj = {};

      if (obj != null) {
        for (var key in obj) {
          if (Object.prototype.hasOwnProperty.call(obj, key)) {
            var desc =
              Object.defineProperty && Object.getOwnPropertyDescriptor
                ? Object.getOwnPropertyDescriptor(obj, key)
                : {};

            if (desc.get || desc.set) {
              Object.defineProperty(newObj, key, desc);
            } else {
              newObj[key] = obj[key];
            }
          }
        }
      }

      newObj.default = obj;
      return newObj;
    }
  }

  function _newArrowCheck(innerThis, boundThis) {
    if (innerThis !== boundThis) {
      throw new TypeError('Cannot instantiate an arrow function');
    }
  }

  function _objectDestructuringEmpty(obj) {
    if (obj == null) throw new TypeError('Cannot destructure undefined');
  }

  function _objectWithoutPropertiesLoose(source, excluded) {
    if (source == null) return {};
    var target = {};
    var sourceKeys = Object.keys(source);
    var key, i;

    for (i = 0; i < sourceKeys.length; i++) {
      key = sourceKeys[i];
      if (excluded.indexOf(key) >= 0) continue;
      target[key] = source[key];
    }

    return target;
  }

  function _objectWithoutProperties(source, excluded) {
    if (source == null) return {};

    var target = _objectWithoutPropertiesLoose(source, excluded);

    var key, i;

    if (Object.getOwnPropertySymbols) {
      var sourceSymbolKeys = Object.getOwnPropertySymbols(source);

      for (i = 0; i < sourceSymbolKeys.length; i++) {
        key = sourceSymbolKeys[i];
        if (excluded.indexOf(key) >= 0) continue;
        if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
        target[key] = source[key];
      }
    }

    return target;
  }

  function _assertThisInitialized(self) {
    if (self === void 0) {
      throw new ReferenceError(
        "this hasn't been initialised - super() hasn't been called"
      );
    }

    return self;
  }

  function _possibleConstructorReturn(self, call) {
    if (call && (typeof call === 'object' || typeof call === 'function')) {
      return call;
    }

    return _assertThisInitialized(self);
  }

  function _superPropBase(object, property) {
    while (!Object.prototype.hasOwnProperty.call(object, property)) {
      object = _getPrototypeOf(object);
      if (object === null) break;
    }

    return object;
  }

  function _get(target, property, receiver) {
    if (typeof Reflect !== 'undefined' && Reflect.get) {
      _get = Reflect.get;
    } else {
      _get = function _get(target, property, receiver) {
        var base = _superPropBase(target, property);

        if (!base) return;
        var desc = Object.getOwnPropertyDescriptor(base, property);

        if (desc.get) {
          return desc.get.call(receiver);
        }

        return desc.value;
      };
    }

    return _get(target, property, receiver || target);
  }

  function set(target, property, value, receiver) {
    if (typeof Reflect !== 'undefined' && Reflect.set) {
      set = Reflect.set;
    } else {
      set = function set(target, property, value, receiver) {
        var base = _superPropBase(target, property);

        var desc;

        if (base) {
          desc = Object.getOwnPropertyDescriptor(base, property);

          if (desc.set) {
            desc.set.call(receiver, value);
            return true;
          } else if (!desc.writable) {
            return false;
          }
        }

        desc = Object.getOwnPropertyDescriptor(receiver, property);

        if (desc) {
          if (!desc.writable) {
            return false;
          }

          desc.value = value;
          Object.defineProperty(receiver, property, desc);
        } else {
          _defineProperty(receiver, property, value);
        }

        return true;
      };
    }

    return set(target, property, value, receiver);
  }

  function _set(target, property, value, receiver, isStrict) {
    var s = set(target, property, value, receiver || target);

    if (!s && isStrict) {
      throw new Error('failed to set property');
    }

    return value;
  }

  function _taggedTemplateLiteral(strings, raw) {
    if (!raw) {
      raw = strings.slice(0);
    }

    return Object.freeze(
      Object.defineProperties(strings, {
        raw: {
          value: Object.freeze(raw)
        }
      })
    );
  }

  function _taggedTemplateLiteralLoose(strings, raw) {
    if (!raw) {
      raw = strings.slice(0);
    }

    strings.raw = raw;
    return strings;
  }

  function _temporalRef(val, name) {
    if (val === _temporalUndefined) {
      throw new ReferenceError(name + ' is not defined - temporal dead zone');
    } else {
      return val;
    }
  }

  function _readOnlyError(name) {
    throw new Error('"' + name + '" is read-only');
  }

  function _classNameTDZError(name) {
    throw new Error(
      'Class "' + name + '" cannot be referenced in computed property keys.'
    );
  }

  var _temporalUndefined = {};

  function _slicedToArray(arr, i) {
    return (
      _arrayWithHoles(arr) ||
      _iterableToArrayLimit(arr, i) ||
      _nonIterableRest()
    );
  }

  function _slicedToArrayLoose(arr, i) {
    return (
      _arrayWithHoles(arr) ||
      _iterableToArrayLimitLoose(arr, i) ||
      _nonIterableRest()
    );
  }

  function _toArray(arr) {
    return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest();
  }

  function _toConsumableArray(arr) {
    return (
      _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread()
    );
  }

  function _arrayWithoutHoles(arr) {
    if (Array.isArray(arr)) {
      for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++)
        arr2[i] = arr[i];

      return arr2;
    }
  }

  function _arrayWithHoles(arr) {
    if (Array.isArray(arr)) return arr;
  }

  function _iterableToArray(iter) {
    if (
      Symbol.iterator in Object(iter) ||
      Object.prototype.toString.call(iter) === '[object Arguments]'
    )
      return Array.from(iter);
  }

  function _iterableToArrayLimit(arr, i) {
    var _arr = [];
    var _n = true;
    var _d = false;
    var _e = undefined;

    try {
      for (
        var _i = arr[Symbol.iterator](), _s;
        !(_n = (_s = _i.next()).done);
        _n = true
      ) {
        _arr.push(_s.value);

        if (i && _arr.length === i) break;
      }
    } catch (err) {
      _d = true;
      _e = err;
    } finally {
      try {
        if (!_n && _i['return'] != null) _i['return']();
      } finally {
        if (_d) throw _e;
      }
    }

    return _arr;
  }

  function _iterableToArrayLimitLoose(arr, i) {
    var _arr = [];

    for (
      var _iterator = arr[Symbol.iterator](), _step;
      !(_step = _iterator.next()).done;

    ) {
      _arr.push(_step.value);

      if (i && _arr.length === i) break;
    }

    return _arr;
  }

  function _nonIterableSpread() {
    throw new TypeError('Invalid attempt to spread non-iterable instance');
  }

  function _nonIterableRest() {
    throw new TypeError('Invalid attempt to destructure non-iterable instance');
  }

  function _skipFirstGeneratorNext(fn) {
    return function() {
      var it = fn.apply(this, arguments);
      it.next();
      return it;
    };
  }

  function _toPrimitive(input, hint) {
    if (typeof input !== 'object' || input === null) return input;
    var prim = input[Symbol.toPrimitive];

    if (prim !== undefined) {
      var res = prim.call(input, hint || 'default');
      if (typeof res !== 'object') return res;
      throw new TypeError('@@toPrimitive must return a primitive value.');
    }

    return (hint === 'string' ? String : Number)(input);
  }

  function _toPropertyKey(arg) {
    var key = _toPrimitive(arg, 'string');

    return typeof key === 'symbol' ? key : String(key);
  }

  function _initializerWarningHelper(descriptor, context) {
    throw new Error(
      'Decorating class property failed. Please ensure that ' +
        'proposal-class-properties is enabled and set to use loose mode. ' +
        'To use proposal-class-properties in spec mode with decorators, wait for ' +
        'the next major version of decorators in stage 2.'
    );
  }

  function _initializerDefineProperty(target, property, descriptor, context) {
    if (!descriptor) return;
    Object.defineProperty(target, property, {
      enumerable: descriptor.enumerable,
      configurable: descriptor.configurable,
      writable: descriptor.writable,
      value: descriptor.initializer
        ? descriptor.initializer.call(context)
        : void 0
    });
  }

  function _applyDecoratedDescriptor(
    target,
    property,
    decorators,
    descriptor,
    context
  ) {
    var desc = {};
    Object.keys(descriptor).forEach(function(key) {
      desc[key] = descriptor[key];
    });
    desc.enumerable = !!desc.enumerable;
    desc.configurable = !!desc.configurable;

    if ('value' in desc || desc.initializer) {
      desc.writable = true;
    }

    desc = decorators
      .slice()
      .reverse()
      .reduce(function(desc, decorator) {
        return decorator(target, property, desc) || desc;
      }, desc);

    if (context && desc.initializer !== void 0) {
      desc.value = desc.initializer ? desc.initializer.call(context) : void 0;
      desc.initializer = undefined;
    }

    if (desc.initializer === void 0) {
      Object.defineProperty(target, property, desc);
      desc = null;
    }

    return desc;
  }

  var id = 0;

  function _classPrivateFieldLooseKey(name) {
    return '__private_' + id++ + '_' + name;
  }

  function _classPrivateFieldLooseBase(receiver, privateKey) {
    if (!Object.prototype.hasOwnProperty.call(receiver, privateKey)) {
      throw new TypeError('attempted to use private field on non-instance');
    }

    return receiver;
  }

  function _classPrivateFieldGet(receiver, privateMap) {
    if (!privateMap.has(receiver)) {
      throw new TypeError('attempted to get private field on non-instance');
    }

    var descriptor = privateMap.get(receiver);

    if (descriptor.get) {
      return descriptor.get.call(receiver);
    }

    return descriptor.value;
  }

  function _classPrivateFieldSet(receiver, privateMap, value) {
    if (!privateMap.has(receiver)) {
      throw new TypeError('attempted to set private field on non-instance');
    }

    var descriptor = privateMap.get(receiver);

    if (descriptor.set) {
      descriptor.set.call(receiver, value);
    } else {
      if (!descriptor.writable) {
        throw new TypeError('attempted to set read only private field');
      }

      descriptor.value = value;
    }

    return value;
  }

  function _classStaticPrivateFieldSpecGet(
    receiver,
    classConstructor,
    descriptor
  ) {
    if (receiver !== classConstructor) {
      throw new TypeError('Private static access of wrong provenance');
    }

    return descriptor.value;
  }

  function _classStaticPrivateFieldSpecSet(
    receiver,
    classConstructor,
    descriptor,
    value
  ) {
    if (receiver !== classConstructor) {
      throw new TypeError('Private static access of wrong provenance');
    }

    if (!descriptor.writable) {
      throw new TypeError('attempted to set read only private field');
    }

    descriptor.value = value;
    return value;
  }

  function _classStaticPrivateMethodGet(receiver, classConstructor, method) {
    if (receiver !== classConstructor) {
      throw new TypeError('Private static access of wrong provenance');
    }

    return method;
  }

  function _classStaticPrivateMethodSet() {
    throw new TypeError('attempted to set read only static private field');
  }

  function _decorate(decorators, factory, superClass, mixins) {
    var api = _getDecoratorsApi();

    if (mixins) {
      for (var i = 0; i < mixins.length; i++) {
        api = mixins[i](api);
      }
    }

    var r = factory(function initialize(O) {
      api.initializeInstanceElements(O, decorated.elements);
    }, superClass);
    var decorated = api.decorateClass(
      _coalesceClassElements(r.d.map(_createElementDescriptor)),
      decorators
    );
    api.initializeClassElements(r.F, decorated.elements);
    return api.runClassFinishers(r.F, decorated.finishers);
  }

  function _getDecoratorsApi() {
    _getDecoratorsApi = function() {
      return api;
    };

    var api = {
      elementsDefinitionOrder: [['method'], ['field']],
      initializeInstanceElements: function(O, elements) {
        ['method', 'field'].forEach(function(kind) {
          elements.forEach(function(element) {
            if (element.kind === kind && element.placement === 'own') {
              this.defineClassElement(O, element);
            }
          }, this);
        }, this);
      },
      initializeClassElements: function(F, elements) {
        var proto = F.prototype;
        ['method', 'field'].forEach(function(kind) {
          elements.forEach(function(element) {
            var placement = element.placement;

            if (
              element.kind === kind &&
              (placement === 'static' || placement === 'prototype')
            ) {
              var receiver = placement === 'static' ? F : proto;
              this.defineClassElement(receiver, element);
            }
          }, this);
        }, this);
      },
      defineClassElement: function(receiver, element) {
        var descriptor = element.descriptor;

        if (element.kind === 'field') {
          var initializer = element.initializer;
          descriptor = {
            enumerable: descriptor.enumerable,
            writable: descriptor.writable,
            configurable: descriptor.configurable,
            value: initializer === void 0 ? void 0 : initializer.call(receiver)
          };
        }

        Object.defineProperty(receiver, element.key, descriptor);
      },
      decorateClass: function(elements, decorators) {
        var newElements = [];
        var finishers = [];
        var placements = {
          static: [],
          prototype: [],
          own: []
        };
        elements.forEach(function(element) {
          this.addElementPlacement(element, placements);
        }, this);
        elements.forEach(function(element) {
          if (!_hasDecorators(element)) return newElements.push(element);
          var elementFinishersExtras = this.decorateElement(
            element,
            placements
          );
          newElements.push(elementFinishersExtras.element);
          newElements.push.apply(newElements, elementFinishersExtras.extras);
          finishers.push.apply(finishers, elementFinishersExtras.finishers);
        }, this);

        if (!decorators) {
          return {
            elements: newElements,
            finishers: finishers
          };
        }

        var result = this.decorateConstructor(newElements, decorators);
        finishers.push.apply(finishers, result.finishers);
        result.finishers = finishers;
        return result;
      },
      addElementPlacement: function(element, placements, silent) {
        var keys = placements[element.placement];

        if (!silent && keys.indexOf(element.key) !== -1) {
          throw new TypeError('Duplicated element (' + element.key + ')');
        }

        keys.push(element.key);
      },
      decorateElement: function(element, placements) {
        var extras = [];
        var finishers = [];

        for (
          var decorators = element.decorators, i = decorators.length - 1;
          i >= 0;
          i--
        ) {
          var keys = placements[element.placement];
          keys.splice(keys.indexOf(element.key), 1);
          var elementObject = this.fromElementDescriptor(element);
          var elementFinisherExtras = this.toElementFinisherExtras(
            (0, decorators[i])(elementObject) || elementObject
          );
          element = elementFinisherExtras.element;
          this.addElementPlacement(element, placements);

          if (elementFinisherExtras.finisher) {
            finishers.push(elementFinisherExtras.finisher);
          }

          var newExtras = elementFinisherExtras.extras;

          if (newExtras) {
            for (var j = 0; j < newExtras.length; j++) {
              this.addElementPlacement(newExtras[j], placements);
            }

            extras.push.apply(extras, newExtras);
          }
        }

        return {
          element: element,
          finishers: finishers,
          extras: extras
        };
      },
      decorateConstructor: function(elements, decorators) {
        var finishers = [];

        for (var i = decorators.length - 1; i >= 0; i--) {
          var obj = this.fromClassDescriptor(elements);
          var elementsAndFinisher = this.toClassDescriptor(
            (0, decorators[i])(obj) || obj
          );

          if (elementsAndFinisher.finisher !== undefined) {
            finishers.push(elementsAndFinisher.finisher);
          }

          if (elementsAndFinisher.elements !== undefined) {
            elements = elementsAndFinisher.elements;

            for (var j = 0; j < elements.length - 1; j++) {
              for (var k = j + 1; k < elements.length; k++) {
                if (
                  elements[j].key === elements[k].key &&
                  elements[j].placement === elements[k].placement
                ) {
                  throw new TypeError(
                    'Duplicated element (' + elements[j].key + ')'
                  );
                }
              }
            }
          }
        }

        return {
          elements: elements,
          finishers: finishers
        };
      },
      fromElementDescriptor: function(element) {
        var obj = {
          kind: element.kind,
          key: element.key,
          placement: element.placement,
          descriptor: element.descriptor
        };
        var desc = {
          value: 'Descriptor',
          configurable: true
        };
        Object.defineProperty(obj, Symbol.toStringTag, desc);
        if (element.kind === 'field') obj.initializer = element.initializer;
        return obj;
      },
      toElementDescriptors: function(elementObjects) {
        if (elementObjects === undefined) return;
        return _toArray(elementObjects).map(function(elementObject) {
          var element = this.toElementDescriptor(elementObject);
          this.disallowProperty(
            elementObject,
            'finisher',
            'An element descriptor'
          );
          this.disallowProperty(
            elementObject,
            'extras',
            'An element descriptor'
          );
          return element;
        }, this);
      },
      toElementDescriptor: function(elementObject) {
        var kind = String(elementObject.kind);

        if (kind !== 'method' && kind !== 'field') {
          throw new TypeError(
            'An element descriptor\'s .kind property must be either "method" or' +
              ' "field", but a decorator created an element descriptor with' +
              ' .kind "' +
              kind +
              '"'
          );
        }

        var key = _toPropertyKey(elementObject.key);

        var placement = String(elementObject.placement);

        if (
          placement !== 'static' &&
          placement !== 'prototype' &&
          placement !== 'own'
        ) {
          throw new TypeError(
            'An element descriptor\'s .placement property must be one of "static",' +
              ' "prototype" or "own", but a decorator created an element descriptor' +
              ' with .placement "' +
              placement +
              '"'
          );
        }

        var descriptor = elementObject.descriptor;
        this.disallowProperty(
          elementObject,
          'elements',
          'An element descriptor'
        );
        var element = {
          kind: kind,
          key: key,
          placement: placement,
          descriptor: Object.assign({}, descriptor)
        };

        if (kind !== 'field') {
          this.disallowProperty(
            elementObject,
            'initializer',
            'A method descriptor'
          );
        } else {
          this.disallowProperty(
            descriptor,
            'get',
            'The property descriptor of a field descriptor'
          );
          this.disallowProperty(
            descriptor,
            'set',
            'The property descriptor of a field descriptor'
          );
          this.disallowProperty(
            descriptor,
            'value',
            'The property descriptor of a field descriptor'
          );
          element.initializer = elementObject.initializer;
        }

        return element;
      },
      toElementFinisherExtras: function(elementObject) {
        var element = this.toElementDescriptor(elementObject);

        var finisher = _optionalCallableProperty(elementObject, 'finisher');

        var extras = this.toElementDescriptors(elementObject.extras);
        return {
          element: element,
          finisher: finisher,
          extras: extras
        };
      },
      fromClassDescriptor: function(elements) {
        var obj = {
          kind: 'class',
          elements: elements.map(this.fromElementDescriptor, this)
        };
        var desc = {
          value: 'Descriptor',
          configurable: true
        };
        Object.defineProperty(obj, Symbol.toStringTag, desc);
        return obj;
      },
      toClassDescriptor: function(obj) {
        var kind = String(obj.kind);

        if (kind !== 'class') {
          throw new TypeError(
            'A class descriptor\'s .kind property must be "class", but a decorator' +
              ' created a class descriptor with .kind "' +
              kind +
              '"'
          );
        }

        this.disallowProperty(obj, 'key', 'A class descriptor');
        this.disallowProperty(obj, 'placement', 'A class descriptor');
        this.disallowProperty(obj, 'descriptor', 'A class descriptor');
        this.disallowProperty(obj, 'initializer', 'A class descriptor');
        this.disallowProperty(obj, 'extras', 'A class descriptor');

        var finisher = _optionalCallableProperty(obj, 'finisher');

        var elements = this.toElementDescriptors(obj.elements);
        return {
          elements: elements,
          finisher: finisher
        };
      },
      runClassFinishers: function(constructor, finishers) {
        for (var i = 0; i < finishers.length; i++) {
          var newConstructor = (0, finishers[i])(constructor);

          if (newConstructor !== undefined) {
            if (typeof newConstructor !== 'function') {
              throw new TypeError('Finishers must return a constructor.');
            }

            constructor = newConstructor;
          }
        }

        return constructor;
      },
      disallowProperty: function(obj, name, objectType) {
        if (obj[name] !== undefined) {
          throw new TypeError(
            objectType + " can't have a ." + name + ' property.'
          );
        }
      }
    };
    return api;
  }

  function _createElementDescriptor(def) {
    var key = _toPropertyKey(def.key);

    var descriptor;

    if (def.kind === 'method') {
      descriptor = {
        value: def.value,
        writable: true,
        configurable: true,
        enumerable: false
      };
    } else if (def.kind === 'get') {
      descriptor = {
        get: def.value,
        configurable: true,
        enumerable: false
      };
    } else if (def.kind === 'set') {
      descriptor = {
        set: def.value,
        configurable: true,
        enumerable: false
      };
    } else if (def.kind === 'field') {
      descriptor = {
        configurable: true,
        writable: true,
        enumerable: true
      };
    }

    var element = {
      kind: def.kind === 'field' ? 'field' : 'method',
      key: key,
      placement: def.static
        ? 'static'
        : def.kind === 'field'
        ? 'own'
        : 'prototype',
      descriptor: descriptor
    };
    if (def.decorators) element.decorators = def.decorators;
    if (def.kind === 'field') element.initializer = def.value;
    return element;
  }

  function _coalesceGetterSetter(element, other) {
    if (element.descriptor.get !== undefined) {
      other.descriptor.get = element.descriptor.get;
    } else {
      other.descriptor.set = element.descriptor.set;
    }
  }

  function _coalesceClassElements(elements) {
    var newElements = [];

    var isSameElement = function(other) {
      return (
        other.kind === 'method' &&
        other.key === element.key &&
        other.placement === element.placement
      );
    };

    for (var i = 0; i < elements.length; i++) {
      var element = elements[i];
      var other;

      if (
        element.kind === 'method' &&
        (other = newElements.find(isSameElement))
      ) {
        if (
          _isDataDescriptor(element.descriptor) ||
          _isDataDescriptor(other.descriptor)
        ) {
          if (_hasDecorators(element) || _hasDecorators(other)) {
            throw new ReferenceError(
              'Duplicated methods (' + element.key + ") can't be decorated."
            );
          }

          other.descriptor = element.descriptor;
        } else {
          if (_hasDecorators(element)) {
            if (_hasDecorators(other)) {
              throw new ReferenceError(
                "Decorators can't be placed on different accessors with for " +
                  'the same property (' +
                  element.key +
                  ').'
              );
            }

            other.decorators = element.decorators;
          }

          _coalesceGetterSetter(element, other);
        }
      } else {
        newElements.push(element);
      }
    }

    return newElements;
  }

  function _hasDecorators(element) {
    return element.decorators && element.decorators.length;
  }

  function _isDataDescriptor(desc) {
    return (
      desc !== undefined &&
      !(desc.value === undefined && desc.writable === undefined)
    );
  }

  function _optionalCallableProperty(obj, name) {
    var value = obj[name];

    if (value !== undefined && typeof value !== 'function') {
      throw new TypeError("Expected '" + name + "' to be a function");
    }

    return value;
  }

  function _classPrivateMethodGet(receiver, privateSet, fn) {
    if (!privateSet.has(receiver)) {
      throw new TypeError('attempted to get private field on non-instance');
    }

    return fn;
  }

  function _classPrivateMethodSet() {
    throw new TypeError('attempted to reassign private method');
  }

  function _wrapRegExp(re, groups) {
    _wrapRegExp = function(re, groups) {
      return new BabelRegExp(re, groups);
    };

    var _RegExp = _wrapNativeSuper(RegExp);

    var _super = RegExp.prototype;

    var _groups = new WeakMap();

    function BabelRegExp(re, groups) {
      var _this = _RegExp.call(this, re);

      _groups.set(_this, groups);

      return _this;
    }

    _inherits(BabelRegExp, _RegExp);

    BabelRegExp.prototype.exec = function(str) {
      var result = _super.exec.call(this, str);

      if (result) result.groups = buildGroups(result, this);
      return result;
    };

    BabelRegExp.prototype[Symbol.replace] = function(str, substitution) {
      if (typeof substitution === 'string') {
        var groups = _groups.get(this);

        return _super[Symbol.replace].call(
          this,
          str,
          substitution.replace(/\$<([^>]+)>/g, function(_, name) {
            return '$' + groups[name];
          })
        );
      } else if (typeof substitution === 'function') {
        var _this = this;

        return _super[Symbol.replace].call(this, str, function() {
          var args = [];
          args.push.apply(args, arguments);

          if (typeof args[args.length - 1] !== 'object') {
            args.push(buildGroups(args, _this));
          }

          return substitution.apply(this, args);
        });
      } else {
        return _super[Symbol.replace].call(this, str, substitution);
      }
    };

    function buildGroups(result, re) {
      var g = _groups.get(re);

      return Object.keys(g).reduce(function(groups, name) {
        groups[name] = result[g[name]];
        return groups;
      }, Object.create(null));
    }

    return _wrapRegExp.apply(this, arguments);
  }

  var vectorMultiply = function vectorMultiply(v, amount) {
    return createVector(v.x * amount, v.y * amount);
  };

  var vectorAdd = function vectorAdd(a, b) {
    return createVector(a.x + b.x, a.y + b.y);
  };

  var vectorNormalize = function vectorNormalize(v) {
    var l = Math.sqrt(v.x * v.x + v.y * v.y);
    if (l === 0) {
      return {
        x: 0,
        y: 0
      };
    }
    return createVector(v.x / l, v.y / l);
  };

  var vectorRotate = function vectorRotate(v, radians, origin) {
    var cos = Math.cos(radians);
    var sin = Math.sin(radians);
    var t = createVector(v.x - origin.x, v.y - origin.y);
    return createVector(
      origin.x + cos * t.x - sin * t.y,
      origin.y + sin * t.x + cos * t.y
    );
  };

  var createVector = function createVector() {
    var x =
      arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
    var y =
      arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
    return { x: x, y: y };
  };

  var getMarkupValue = function getMarkupValue(value, size) {
    var scalar =
      arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;
    var axis = arguments.length > 3 ? arguments[3] : undefined;
    if (typeof value === 'string') {
      return parseFloat(value) * scalar;
    }
    if (typeof value === 'number') {
      return value * (axis ? size[axis] : Math.min(size.width, size.height));
    }
    return;
  };

  var getMarkupStyles = function getMarkupStyles(markup, size, scale) {
    var lineStyle = markup.borderStyle || markup.lineStyle || 'solid';
    var fill = markup.backgroundColor || markup.fontColor || 'transparent';
    var stroke = markup.borderColor || markup.lineColor || 'transparent';
    var strokeWidth = getMarkupValue(
      markup.borderWidth || markup.lineWidth,
      size,
      scale
    );
    var lineCap = markup.lineCap || 'round';
    var lineJoin = markup.lineJoin || 'round';
    var dashes =
      typeof lineStyle === 'string'
        ? ''
        : lineStyle
            .map(function(v) {
              return getMarkupValue(v, size, scale);
            })
            .join(',');
    var opacity = markup.opacity || 1;
    return {
      'stroke-linecap': lineCap,
      'stroke-linejoin': lineJoin,
      'stroke-width': strokeWidth || 0,
      'stroke-dasharray': dashes,
      stroke: stroke,
      fill: fill,
      opacity: opacity
    };
  };

  var isDefined = function isDefined(value) {
    return value != null;
  };

  var getMarkupRect = function getMarkupRect(rect, size) {
    var scalar =
      arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;

    var left =
      getMarkupValue(rect.x, size, scalar, 'width') ||
      getMarkupValue(rect.left, size, scalar, 'width');
    var top =
      getMarkupValue(rect.y, size, scalar, 'height') ||
      getMarkupValue(rect.top, size, scalar, 'height');
    var width = getMarkupValue(rect.width, size, scalar, 'width');
    var height = getMarkupValue(rect.height, size, scalar, 'height');
    var right = getMarkupValue(rect.right, size, scalar, 'width');
    var bottom = getMarkupValue(rect.bottom, size, scalar, 'height');

    if (!isDefined(top)) {
      if (isDefined(height) && isDefined(bottom)) {
        top = size.height - height - bottom;
      } else {
        top = bottom;
      }
    }

    if (!isDefined(left)) {
      if (isDefined(width) && isDefined(right)) {
        left = size.width - width - right;
      } else {
        left = right;
      }
    }

    if (!isDefined(width)) {
      if (isDefined(left) && isDefined(right)) {
        width = size.width - left - right;
      } else {
        width = 0;
      }
    }

    if (!isDefined(height)) {
      if (isDefined(top) && isDefined(bottom)) {
        height = size.height - top - bottom;
      } else {
        height = 0;
      }
    }

    return {
      x: left || 0,
      y: top || 0,
      width: width || 0,
      height: height || 0
    };
  };

  var pointsToPathShape = function pointsToPathShape(points) {
    return points
      .map(function(point, index) {
        return ''
          .concat(index === 0 ? 'M' : 'L', ' ')
          .concat(point.x, ' ')
          .concat(point.y);
      })
      .join(' ');
  };

  var setAttributes = function setAttributes(element, attr) {
    return Object.keys(attr).forEach(function(key) {
      return element.setAttribute(key, attr[key]);
    });
  };

  var ns = 'http://www.w3.org/2000/svg';
  var svg = function svg(tag, attr) {
    var element = document.createElementNS(ns, tag);
    if (attr) {
      setAttributes(element, attr);
    }
    return element;
  };

  var updateRect = function updateRect(element) {
    return setAttributes(
      element,
      Object.assign({}, element.rect, element.styles)
    );
  };

  var updateEllipse = function updateEllipse(element) {
    var cx = element.rect.x + element.rect.width * 0.5;
    var cy = element.rect.y + element.rect.height * 0.5;
    var rx = element.rect.width * 0.5;
    var ry = element.rect.height * 0.5;
    return setAttributes(
      element,
      Object.assign(
        {
          cx: cx,
          cy: cy,
          rx: rx,
          ry: ry
        },
        element.styles
      )
    );
  };

  var IMAGE_FIT_STYLE = {
    contain: 'xMidYMid meet',
    cover: 'xMidYMid slice'
  };

  var updateImage = function updateImage(element, markup) {
    setAttributes(
      element,
      Object.assign({}, element.rect, element.styles, {
        preserveAspectRatio: IMAGE_FIT_STYLE[markup.fit] || 'none'
      })
    );
  };

  var TEXT_ANCHOR = {
    left: 'start',
    center: 'middle',
    right: 'end'
  };

  var updateText = function updateText(element, markup, size, scale) {
    var fontSize = getMarkupValue(markup.fontSize, size, scale);
    var fontFamily = markup.fontFamily || 'sans-serif';
    var fontWeight = markup.fontWeight || 'normal';
    var textAlign = TEXT_ANCHOR[markup.textAlign] || 'start';

    setAttributes(
      element,
      Object.assign({}, element.rect, element.styles, {
        'stroke-width': 0,
        'font-weight': fontWeight,
        'font-size': fontSize,
        'font-family': fontFamily,
        'text-anchor': textAlign
      })
    );

    // update text
    if (element.text !== markup.text) {
      element.text = markup.text;
      element.textContent = markup.text.length ? markup.text : ' ';
    }
  };

  var updateLine = function updateLine(element, markup, size, scale) {
    setAttributes(
      element,
      Object.assign({}, element.rect, element.styles, {
        fill: 'none'
      })
    );

    var line = element.childNodes[0];
    var begin = element.childNodes[1];
    var end = element.childNodes[2];

    var origin = element.rect;

    var target = {
      x: element.rect.x + element.rect.width,
      y: element.rect.y + element.rect.height
    };

    setAttributes(line, {
      x1: origin.x,
      y1: origin.y,
      x2: target.x,
      y2: target.y
    });

    if (!markup.lineDecoration) return;

    begin.style.display = 'none';
    end.style.display = 'none';

    var v = vectorNormalize({
      x: target.x - origin.x,
      y: target.y - origin.y
    });

    var l = getMarkupValue(0.05, size, scale);

    if (markup.lineDecoration.indexOf('arrow-begin') !== -1) {
      var arrowBeginRotationPoint = vectorMultiply(v, l);
      var arrowBeginCenter = vectorAdd(origin, arrowBeginRotationPoint);
      var arrowBeginA = vectorRotate(origin, 2, arrowBeginCenter);
      var arrowBeginB = vectorRotate(origin, -2, arrowBeginCenter);

      setAttributes(begin, {
        style: 'display:block;',
        d: 'M'
          .concat(arrowBeginA.x, ',')
          .concat(arrowBeginA.y, ' L')
          .concat(origin.x, ',')
          .concat(origin.y, ' L')
          .concat(arrowBeginB.x, ',')
          .concat(arrowBeginB.y)
      });
    }

    if (markup.lineDecoration.indexOf('arrow-end') !== -1) {
      var arrowEndRotationPoint = vectorMultiply(v, -l);
      var arrowEndCenter = vectorAdd(target, arrowEndRotationPoint);
      var arrowEndA = vectorRotate(target, 2, arrowEndCenter);
      var arrowEndB = vectorRotate(target, -2, arrowEndCenter);

      setAttributes(end, {
        style: 'display:block;',
        d: 'M'
          .concat(arrowEndA.x, ',')
          .concat(arrowEndA.y, ' L')
          .concat(target.x, ',')
          .concat(target.y, ' L')
          .concat(arrowEndB.x, ',')
          .concat(arrowEndB.y)
      });
    }
  };

  var updatePath = function updatePath(element, markup, size, scale) {
    setAttributes(
      element,
      Object.assign({}, element.styles, {
        fill: 'none',
        d: pointsToPathShape(
          markup.points.map(function(point) {
            return {
              x: getMarkupValue(point.x, size, scale, 'width'),
              y: getMarkupValue(point.y, size, scale, 'height')
            };
          })
        )
      })
    );
  };

  var createShape = function createShape(node) {
    return function(markup) {
      return svg(node, { id: markup.id });
    };
  };

  var createImage = function createImage(markup) {
    var shape = svg('image', {
      id: markup.id,
      'stroke-linecap': 'round',
      'stroke-linejoin': 'round',
      opacity: '0'
    });

    shape.onload = function() {
      shape.setAttribute('opacity', markup.opacity || 1);
    };
    shape.setAttributeNS(
      'http://www.w3.org/1999/xlink',
      'xlink:href',
      markup.src
    );
    return shape;
  };

  var createLine = function createLine(markup) {
    var shape = svg('g', {
      id: markup.id,
      'stroke-linecap': 'round',
      'stroke-linejoin': 'round'
    });

    var line = svg('line');
    shape.appendChild(line);

    var begin = svg('path');
    shape.appendChild(begin);

    var end = svg('path');
    shape.appendChild(end);

    return shape;
  };

  var CREATE_TYPE_ROUTES = {
    image: createImage,
    rect: createShape('rect'),
    ellipse: createShape('ellipse'),
    text: createShape('text'),
    path: createShape('path'),
    line: createLine
  };

  var UPDATE_TYPE_ROUTES = {
    rect: updateRect,
    ellipse: updateEllipse,
    image: updateImage,
    text: updateText,
    path: updatePath,
    line: updateLine
  };

  var createMarkupByType = function createMarkupByType(type, markup) {
    return CREATE_TYPE_ROUTES[type](markup);
  };

  var updateMarkupByType = function updateMarkupByType(
    element,
    type,
    markup,
    size,
    scale
  ) {
    if (type !== 'path') {
      element.rect = getMarkupRect(markup, size, scale);
    }
    element.styles = getMarkupStyles(markup, size, scale);
    UPDATE_TYPE_ROUTES[type](element, markup, size, scale);
  };

  var MARKUP_RECT = [
    'x',
    'y',
    'left',
    'top',
    'right',
    'bottom',
    'width',
    'height'
  ];

  var toOptionalFraction = function toOptionalFraction(value) {
    return typeof value === 'string' && /%/.test(value)
      ? parseFloat(value) / 100
      : value;
  };

  // adds default markup properties, clones markup
  var prepareMarkup = function prepareMarkup(markup) {
    var _markup = _slicedToArray(markup, 2),
      type = _markup[0],
      props = _markup[1];

    var rect = props.points
      ? {}
      : MARKUP_RECT.reduce(function(prev, curr) {
          prev[curr] = toOptionalFraction(props[curr]);
          return prev;
        }, {});

    return [
      type,
      Object.assign(
        {
          zIndex: 0
        },
        props,
        rect
      )
    ];
  };

  var sortMarkupByZIndex = function sortMarkupByZIndex(a, b) {
    if (a[1].zIndex > b[1].zIndex) {
      return 1;
    }
    if (a[1].zIndex < b[1].zIndex) {
      return -1;
    }
    return 0;
  };

  var createMarkupView = function createMarkupView(_) {
    return _.utils.createView({
      name: 'image-preview-markup',
      tag: 'svg',
      ignoreRect: true,
      mixins: {
        apis: ['width', 'height', 'crop', 'markup', 'resize', 'dirty']
      },

      write: function write(_ref) {
        var root = _ref.root,
          props = _ref.props;

        if (!props.dirty) return;
        var crop = props.crop,
          resize = props.resize,
          markup = props.markup;

        var viewWidth = props.width;
        var viewHeight = props.height;

        var cropWidth = crop.width;
        var cropHeight = crop.height;

        if (resize) {
          var _size = resize.size;

          var outputWidth = _size && _size.width;
          var outputHeight = _size && _size.height;
          var outputFit = resize.mode;
          var outputUpscale = resize.upscale;

          if (outputWidth && !outputHeight) outputHeight = outputWidth;
          if (outputHeight && !outputWidth) outputWidth = outputHeight;

          var shouldUpscale =
            cropWidth < outputWidth && cropHeight < outputHeight;

          if (!shouldUpscale || (shouldUpscale && outputUpscale)) {
            var scalarWidth = outputWidth / cropWidth;
            var scalarHeight = outputHeight / cropHeight;

            if (outputFit === 'force') {
              cropWidth = outputWidth;
              cropHeight = outputHeight;
            } else {
              var scalar;
              if (outputFit === 'cover') {
                scalar = Math.max(scalarWidth, scalarHeight);
              } else if (outputFit === 'contain') {
                scalar = Math.min(scalarWidth, scalarHeight);
              }
              cropWidth = cropWidth * scalar;
              cropHeight = cropHeight * scalar;
            }
          }
        }

        var size = {
          width: viewWidth,
          height: viewHeight
        };

        root.element.setAttribute('width', size.width);
        root.element.setAttribute('height', size.height);

        var scale = Math.min(viewWidth / cropWidth, viewHeight / cropHeight);

        // clear
        root.element.innerHTML = '';

        // get filter
        var markupFilter = root.query('GET_IMAGE_PREVIEW_MARKUP_FILTER');

        // draw new
        markup
          .filter(markupFilter)
          .map(prepareMarkup)
          .sort(sortMarkupByZIndex)
          .forEach(function(markup) {
            var _markup = _slicedToArray(markup, 2),
              type = _markup[0],
              settings = _markup[1];

            // create
            var element = createMarkupByType(type, settings);

            // update
            updateMarkupByType(element, type, settings, size, scale);

            // add
            root.element.appendChild(element);
          });
      }
    });
  };

  var createVector$1 = function createVector(x, y) {
    return { x: x, y: y };
  };

  var vectorDot = function vectorDot(a, b) {
    return a.x * b.x + a.y * b.y;
  };

  var vectorSubtract = function vectorSubtract(a, b) {
    return createVector$1(a.x - b.x, a.y - b.y);
  };

  var vectorDistanceSquared = function vectorDistanceSquared(a, b) {
    return vectorDot(vectorSubtract(a, b), vectorSubtract(a, b));
  };

  var vectorDistance = function vectorDistance(a, b) {
    return Math.sqrt(vectorDistanceSquared(a, b));
  };

  var getOffsetPointOnEdge = function getOffsetPointOnEdge(length, rotation) {
    var a = length;

    var A = 1.5707963267948966;
    var B = rotation;
    var C = 1.5707963267948966 - rotation;

    var sinA = Math.sin(A);
    var sinB = Math.sin(B);
    var sinC = Math.sin(C);
    var cosC = Math.cos(C);
    var ratio = a / sinA;
    var b = ratio * sinB;
    var c = ratio * sinC;

    return createVector$1(cosC * b, cosC * c);
  };

  var getRotatedRectSize = function getRotatedRectSize(rect, rotation) {
    var w = rect.width;
    var h = rect.height;

    var hor = getOffsetPointOnEdge(w, rotation);
    var ver = getOffsetPointOnEdge(h, rotation);

    var tl = createVector$1(rect.x + Math.abs(hor.x), rect.y - Math.abs(hor.y));

    var tr = createVector$1(
      rect.x + rect.width + Math.abs(ver.y),
      rect.y + Math.abs(ver.x)
    );

    var bl = createVector$1(
      rect.x - Math.abs(ver.y),
      rect.y + rect.height - Math.abs(ver.x)
    );

    return {
      width: vectorDistance(tl, tr),
      height: vectorDistance(tl, bl)
    };
  };

  var calculateCanvasSize = function calculateCanvasSize(
    image,
    canvasAspectRatio
  ) {
    var zoom =
      arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;

    var imageAspectRatio = image.height / image.width;

    // determine actual pixels on x and y axis
    var canvasWidth = 1;
    var canvasHeight = canvasAspectRatio;
    var imgWidth = 1;
    var imgHeight = imageAspectRatio;
    if (imgHeight > canvasHeight) {
      imgHeight = canvasHeight;
      imgWidth = imgHeight / imageAspectRatio;
    }

    var scalar = Math.max(canvasWidth / imgWidth, canvasHeight / imgHeight);
    var width = image.width / (zoom * scalar * imgWidth);
    var height = width * canvasAspectRatio;

    return {
      width: width,
      height: height
    };
  };

  var getImageRectZoomFactor = function getImageRectZoomFactor(
    imageRect,
    cropRect,
    rotation,
    center
  ) {
    // calculate available space round image center position
    var cx = center.x > 0.5 ? 1 - center.x : center.x;
    var cy = center.y > 0.5 ? 1 - center.y : center.y;
    var imageWidth = cx * 2 * imageRect.width;
    var imageHeight = cy * 2 * imageRect.height;

    // calculate rotated crop rectangle size
    var rotatedCropSize = getRotatedRectSize(cropRect, rotation);

    // calculate scalar required to fit image
    return Math.max(
      rotatedCropSize.width / imageWidth,
      rotatedCropSize.height / imageHeight
    );
  };

  var getCenteredCropRect = function getCenteredCropRect(
    container,
    aspectRatio
  ) {
    var width = container.width;
    var height = width * aspectRatio;
    if (height > container.height) {
      height = container.height;
      width = height / aspectRatio;
    }
    var x = (container.width - width) * 0.5;
    var y = (container.height - height) * 0.5;

    return {
      x: x,
      y: y,
      width: width,
      height: height
    };
  };

  var getCurrentCropSize = function getCurrentCropSize(imageSize) {
    var crop =
      arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    var zoom = crop.zoom,
      rotation = crop.rotation,
      center = crop.center,
      aspectRatio = crop.aspectRatio;

    if (!aspectRatio) aspectRatio = imageSize.height / imageSize.width;

    var canvasSize = calculateCanvasSize(imageSize, aspectRatio, zoom);

    var canvasCenter = {
      x: canvasSize.width * 0.5,
      y: canvasSize.height * 0.5
    };

    var stage = {
      x: 0,
      y: 0,
      width: canvasSize.width,
      height: canvasSize.height,
      center: canvasCenter
    };

    var shouldLimit = typeof crop.scaleToFit === 'undefined' || crop.scaleToFit;

    var stageZoomFactor = getImageRectZoomFactor(
      imageSize,
      getCenteredCropRect(stage, aspectRatio),
      rotation,
      shouldLimit ? center : { x: 0.5, y: 0.5 }
    );

    var scale = zoom * stageZoomFactor;

    // start drawing
    return {
      widthFloat: canvasSize.width / scale,
      heightFloat: canvasSize.height / scale,
      width: Math.round(canvasSize.width / scale),
      height: Math.round(canvasSize.height / scale)
    };
  };

  var IMAGE_SCALE_SPRING_PROPS = {
    type: 'spring',
    stiffness: 0.5,
    damping: 0.45,
    mass: 10
  };

  // does horizontal and vertical flipping
  var createBitmapView = function createBitmapView(_) {
    return _.utils.createView({
      name: 'image-bitmap',
      ignoreRect: true,
      mixins: { styles: ['scaleX', 'scaleY'] },
      create: function create(_ref) {
        var root = _ref.root,
          props = _ref.props;
        root.appendChild(props.image);
      }
    });
  };

  // shifts and rotates image
  var createImageCanvasWrapper = function createImageCanvasWrapper(_) {
    return _.utils.createView({
      name: 'image-canvas-wrapper',
      tag: 'div',
      ignoreRect: true,
      mixins: {
        apis: ['crop', 'width', 'height'],

        styles: [
          'originX',
          'originY',
          'translateX',
          'translateY',
          'scaleX',
          'scaleY',
          'rotateZ'
        ],

        animations: {
          originX: IMAGE_SCALE_SPRING_PROPS,
          originY: IMAGE_SCALE_SPRING_PROPS,
          scaleX: IMAGE_SCALE_SPRING_PROPS,
          scaleY: IMAGE_SCALE_SPRING_PROPS,
          translateX: IMAGE_SCALE_SPRING_PROPS,
          translateY: IMAGE_SCALE_SPRING_PROPS,
          rotateZ: IMAGE_SCALE_SPRING_PROPS
        }
      },

      create: function create(_ref2) {
        var root = _ref2.root,
          props = _ref2.props;
        props.width = props.image.width;
        props.height = props.image.height;
        root.ref.bitmap = root.appendChildView(
          root.createChildView(createBitmapView(_), { image: props.image })
        );
      },
      write: function write(_ref3) {
        var root = _ref3.root,
          props = _ref3.props;
        var flip = props.crop.flip;
        var bitmap = root.ref.bitmap;
        bitmap.scaleX = flip.horizontal ? -1 : 1;
        bitmap.scaleY = flip.vertical ? -1 : 1;
      }
    });
  };

  // clips canvas to correct aspect ratio
  var createClipView = function createClipView(_) {
    return _.utils.createView({
      name: 'image-clip',
      tag: 'div',
      ignoreRect: true,
      mixins: {
        apis: [
          'crop',
          'markup',
          'resize',
          'width',
          'height',
          'dirty',
          'background'
        ],

        styles: ['width', 'height', 'opacity'],
        animations: {
          opacity: { type: 'tween', duration: 250 }
        }
      },

      didWriteView: function didWriteView(_ref4) {
        var root = _ref4.root,
          props = _ref4.props;
        if (!props.background) return;
        root.element.style.backgroundColor = props.background;
      },
      create: function create(_ref5) {
        var root = _ref5.root,
          props = _ref5.props;

        root.ref.image = root.appendChildView(
          root.createChildView(
            createImageCanvasWrapper(_),
            Object.assign({}, props)
          )
        );

        root.ref.createMarkup = function() {
          if (root.ref.markup) return;
          root.ref.markup = root.appendChildView(
            root.createChildView(createMarkupView(_), Object.assign({}, props))
          );
        };

        root.ref.destroyMarkup = function() {
          if (!root.ref.markup) return;
          root.removeChildView(root.ref.markup);
          root.ref.markup = null;
        };

        // set up transparency grid
        var transparencyIndicator = root.query(
          'GET_IMAGE_PREVIEW_TRANSPARENCY_INDICATOR'
        );
        if (transparencyIndicator === null) return;

        // grid pattern
        if (transparencyIndicator === 'grid') {
          root.element.dataset.transparencyIndicator = transparencyIndicator;
        }
        // basic color
        else {
          root.element.dataset.transparencyIndicator = 'color';
        }
      },
      write: function write(_ref6) {
        var root = _ref6.root,
          props = _ref6.props,
          shouldOptimize = _ref6.shouldOptimize;
        var crop = props.crop,
          markup = props.markup,
          resize = props.resize,
          dirty = props.dirty,
          width = props.width,
          height = props.height;

        root.ref.image.crop = crop;

        var stage = {
          x: 0,
          y: 0,
          width: width,
          height: height,
          center: {
            x: width * 0.5,
            y: height * 0.5
          }
        };

        var image = {
          width: root.ref.image.width,
          height: root.ref.image.height
        };

        var origin = {
          x: crop.center.x * image.width,
          y: crop.center.y * image.height
        };

        var translation = {
          x: stage.center.x - image.width * crop.center.x,
          y: stage.center.y - image.height * crop.center.y
        };

        var rotation = Math.PI * 2 + (crop.rotation % (Math.PI * 2));

        var cropAspectRatio = crop.aspectRatio || image.height / image.width;

        var shouldLimit =
          typeof crop.scaleToFit === 'undefined' || crop.scaleToFit;

        var stageZoomFactor = getImageRectZoomFactor(
          image,
          getCenteredCropRect(stage, cropAspectRatio),

          rotation,
          shouldLimit ? crop.center : { x: 0.5, y: 0.5 }
        );

        var scale = crop.zoom * stageZoomFactor;

        // update markup view
        if (markup && markup.length) {
          root.ref.createMarkup();
          root.ref.markup.width = width;
          root.ref.markup.height = height;
          root.ref.markup.resize = resize;
          root.ref.markup.dirty = dirty;
          root.ref.markup.markup = markup;
          root.ref.markup.crop = getCurrentCropSize(image, crop);
        } else if (root.ref.markup) {
          root.ref.destroyMarkup();
        }

        // update image view
        var imageView = root.ref.image;

        // don't update clip layout
        if (shouldOptimize) {
          imageView.originX = null;
          imageView.originY = null;
          imageView.translateX = null;
          imageView.translateY = null;
          imageView.rotateZ = null;
          imageView.scaleX = null;
          imageView.scaleY = null;
          return;
        }

        imageView.originX = origin.x;
        imageView.originY = origin.y;
        imageView.translateX = translation.x;
        imageView.translateY = translation.y;
        imageView.rotateZ = rotation;
        imageView.scaleX = scale;
        imageView.scaleY = scale;
      }
    });
  };

  var createImageView = function createImageView(_) {
    return _.utils.createView({
      name: 'image-preview',
      tag: 'div',
      ignoreRect: true,
      mixins: {
        apis: ['image', 'crop', 'markup', 'resize', 'dirty', 'background'],

        styles: ['translateY', 'scaleX', 'scaleY', 'opacity'],

        animations: {
          scaleX: IMAGE_SCALE_SPRING_PROPS,
          scaleY: IMAGE_SCALE_SPRING_PROPS,
          translateY: IMAGE_SCALE_SPRING_PROPS,
          opacity: { type: 'tween', duration: 400 }
        }
      },

      create: function create(_ref7) {
        var root = _ref7.root,
          props = _ref7.props;
        root.ref.clip = root.appendChildView(
          root.createChildView(createClipView(_), {
            id: props.id,
            image: props.image,
            crop: props.crop,
            markup: props.markup,
            resize: props.resize,
            dirty: props.dirty,
            background: props.background
          })
        );
      },
      write: function write(_ref8) {
        var root = _ref8.root,
          props = _ref8.props,
          shouldOptimize = _ref8.shouldOptimize;
        var clip = root.ref.clip;
        var image = props.image,
          crop = props.crop,
          markup = props.markup,
          resize = props.resize,
          dirty = props.dirty;

        clip.crop = crop;
        clip.markup = markup;
        clip.resize = resize;
        clip.dirty = dirty;

        // don't update clip layout
        clip.opacity = shouldOptimize ? 0 : 1;

        // don't re-render if optimizing or hidden (width will be zero resulting in weird animations)
        if (shouldOptimize || root.rect.element.hidden) return;

        // calculate scaled preview image size
        var imageAspectRatio = image.height / image.width;
        var aspectRatio = crop.aspectRatio || imageAspectRatio;

        // calculate container size
        var containerWidth = root.rect.inner.width;
        var containerHeight = root.rect.inner.height;

        var fixedPreviewHeight = root.query('GET_IMAGE_PREVIEW_HEIGHT');
        var minPreviewHeight = root.query('GET_IMAGE_PREVIEW_MIN_HEIGHT');
        var maxPreviewHeight = root.query('GET_IMAGE_PREVIEW_MAX_HEIGHT');

        var panelAspectRatio = root.query('GET_PANEL_ASPECT_RATIO');
        var allowMultiple = root.query('GET_ALLOW_MULTIPLE');

        if (panelAspectRatio && !allowMultiple) {
          fixedPreviewHeight = containerWidth * panelAspectRatio;
          aspectRatio = panelAspectRatio;
        }

        // determine clip width and height
        var clipHeight =
          fixedPreviewHeight !== null
            ? fixedPreviewHeight
            : Math.max(
                minPreviewHeight,
                Math.min(containerWidth * aspectRatio, maxPreviewHeight)
              );

        var clipWidth = clipHeight / aspectRatio;
        if (clipWidth > containerWidth) {
          clipWidth = containerWidth;
          clipHeight = clipWidth * aspectRatio;
        }

        if (clipHeight > containerHeight) {
          clipHeight = containerHeight;
          clipWidth = containerHeight / aspectRatio;
        }

        clip.width = clipWidth;
        clip.height = clipHeight;
      }
    });
  };

  var SVG_MASK =
    '<svg width="500" height="200" viewBox="0 0 500 200" preserveAspectRatio="none">\n    <defs>\n        <radialGradient id="gradient-__UID__" cx=".5" cy="1.25" r="1.15">\n            <stop offset=\'50%\' stop-color=\'#000000\'/>\n            <stop offset=\'56%\' stop-color=\'#0a0a0a\'/>\n            <stop offset=\'63%\' stop-color=\'#262626\'/>\n            <stop offset=\'69%\' stop-color=\'#4f4f4f\'/>\n            <stop offset=\'75%\' stop-color=\'#808080\'/>\n            <stop offset=\'81%\' stop-color=\'#b1b1b1\'/>\n            <stop offset=\'88%\' stop-color=\'#dadada\'/>\n            <stop offset=\'94%\' stop-color=\'#f6f6f6\'/>\n            <stop offset=\'100%\' stop-color=\'#ffffff\'/>\n        </radialGradient>\n        <mask id="mask-__UID__">\n            <rect x="0" y="0" width="500" height="200" fill="url(#gradient-__UID__)"></rect>\n        </mask>\n    </defs>\n    <rect x="0" width="500" height="200" fill="currentColor" mask="url(#mask-__UID__)"></rect>\n</svg>';

  var SVGMaskUniqueId = 0;

  var createImageOverlayView = function createImageOverlayView(fpAPI) {
    return fpAPI.utils.createView({
      name: 'image-preview-overlay',
      tag: 'div',
      ignoreRect: true,
      create: function create(_ref) {
        var root = _ref.root,
          props = _ref.props;
        var mask = SVG_MASK;
        if (document.querySelector('base')) {
          var url = new URL(
            window.location.href.replace(window.location.hash, '')
          ).href;
          mask = mask.replace(/url\(\#/g, 'url(' + url + '#');
        }

        SVGMaskUniqueId++;
        root.element.classList.add(
          'filepond--image-preview-overlay-'.concat(props.status)
        );

        root.element.innerHTML = mask.replace(/__UID__/g, SVGMaskUniqueId);
      },
      mixins: {
        styles: ['opacity'],
        animations: {
          opacity: { type: 'spring', mass: 25 }
        }
      }
    });
  };

  /**
   * Bitmap Worker
   */
  var BitmapWorker = function BitmapWorker() {
    self.onmessage = function(e) {
      createImageBitmap(e.data.message.file).then(function(bitmap) {
        self.postMessage({ id: e.data.id, message: bitmap }, [bitmap]);
      });
    };
  };

  /**
   * ColorMatrix Worker
   */
  var ColorMatrixWorker = function ColorMatrixWorker() {
    self.onmessage = function(e) {
      var imageData = e.data.message.imageData;
      var matrix = e.data.message.colorMatrix;

      var data = imageData.data;
      var l = data.length;

      var m11 = matrix[0];
      var m12 = matrix[1];
      var m13 = matrix[2];
      var m14 = matrix[3];
      var m15 = matrix[4];

      var m21 = matrix[5];
      var m22 = matrix[6];
      var m23 = matrix[7];
      var m24 = matrix[8];
      var m25 = matrix[9];

      var m31 = matrix[10];
      var m32 = matrix[11];
      var m33 = matrix[12];
      var m34 = matrix[13];
      var m35 = matrix[14];

      var m41 = matrix[15];
      var m42 = matrix[16];
      var m43 = matrix[17];
      var m44 = matrix[18];
      var m45 = matrix[19];

      var index = 0,
        r = 0.0,
        g = 0.0,
        b = 0.0,
        a = 0.0;

      for (; index < l; index += 4) {
        r = data[index] / 255;
        g = data[index + 1] / 255;
        b = data[index + 2] / 255;
        a = data[index + 3] / 255;
        data[index] = Math.max(
          0,
          Math.min((r * m11 + g * m12 + b * m13 + a * m14 + m15) * 255, 255)
        );
        data[index + 1] = Math.max(
          0,
          Math.min((r * m21 + g * m22 + b * m23 + a * m24 + m25) * 255, 255)
        );
        data[index + 2] = Math.max(
          0,
          Math.min((r * m31 + g * m32 + b * m33 + a * m34 + m35) * 255, 255)
        );
        data[index + 3] = Math.max(
          0,
          Math.min((r * m41 + g * m42 + b * m43 + a * m44 + m45) * 255, 255)
        );
      }

      self.postMessage({ id: e.data.id, message: imageData }, [
        imageData.data.buffer
      ]);
    };
  };

  var getImageSize = function getImageSize(url, cb) {
    var image = new Image();
    image.onload = function() {
      var width = image.naturalWidth;
      var height = image.naturalHeight;
      image = null;
      cb(width, height);
    };
    image.src = url;
  };

  var transforms = {
    1: function _() {
      return [1, 0, 0, 1, 0, 0];
    },
    2: function _(width) {
      return [-1, 0, 0, 1, width, 0];
    },
    3: function _(width, height) {
      return [-1, 0, 0, -1, width, height];
    },
    4: function _(width, height) {
      return [1, 0, 0, -1, 0, height];
    },
    5: function _() {
      return [0, 1, 1, 0, 0, 0];
    },
    6: function _(width, height) {
      return [0, 1, -1, 0, height, 0];
    },
    7: function _(width, height) {
      return [0, -1, -1, 0, height, width];
    },
    8: function _(width) {
      return [0, -1, 1, 0, 0, width];
    }
  };

  var fixImageOrientation = function fixImageOrientation(
    ctx,
    width,
    height,
    orientation
  ) {
    // no orientation supplied
    if (orientation === -1) {
      return;
    }

    ctx.transform.apply(ctx, transforms[orientation](width, height));
  };

  // draws the preview image to canvas
  var createPreviewImage = function createPreviewImage(
    data,
    width,
    height,
    orientation
  ) {
    // can't draw on half pixels
    width = Math.round(width);
    height = Math.round(height);

    // draw image
    var canvas = document.createElement('canvas');
    canvas.width = width;
    canvas.height = height;
    var ctx = canvas.getContext('2d');

    // if is rotated incorrectly swap width and height
    if (orientation >= 5 && orientation <= 8) {
      var _ref = [height, width];
      width = _ref[0];
      height = _ref[1];
    }

    // correct image orientation
    fixImageOrientation(ctx, width, height, orientation);

    // draw the image
    ctx.drawImage(data, 0, 0, width, height);

    return canvas;
  };

  var isBitmap = function isBitmap(file) {
    return /^image/.test(file.type) && !/svg/.test(file.type);
  };

  var MAX_WIDTH = 10;
  var MAX_HEIGHT = 10;

  var calculateAverageColor = function calculateAverageColor(image) {
    var scalar = Math.min(MAX_WIDTH / image.width, MAX_HEIGHT / image.height);

    var canvas = document.createElement('canvas');
    var ctx = canvas.getContext('2d');
    var width = (canvas.width = Math.ceil(image.width * scalar));
    var height = (canvas.height = Math.ceil(image.height * scalar));
    ctx.drawImage(image, 0, 0, width, height);
    var data = null;
    try {
      data = ctx.getImageData(0, 0, width, height).data;
    } catch (e) {
      return null;
    }
    var l = data.length;

    var r = 0;
    var g = 0;
    var b = 0;
    var i = 0;

    for (; i < l; i += 4) {
      r += data[i] * data[i];
      g += data[i + 1] * data[i + 1];
      b += data[i + 2] * data[i + 2];
    }

    r = averageColor(r, l);
    g = averageColor(g, l);
    b = averageColor(b, l);

    return { r: r, g: g, b: b };
  };

  var averageColor = function averageColor(c, l) {
    return Math.floor(Math.sqrt(c / (l / 4)));
  };

  var cloneCanvas = function cloneCanvas(origin, target) {
    target = target || document.createElement('canvas');
    target.width = origin.width;
    target.height = origin.height;
    var ctx = target.getContext('2d');
    ctx.drawImage(origin, 0, 0);
    return target;
  };

  var cloneImageData = function cloneImageData(imageData) {
    var id;
    try {
      id = new ImageData(imageData.width, imageData.height);
    } catch (e) {
      var canvas = document.createElement('canvas');
      var ctx = canvas.getContext('2d');
      id = ctx.createImageData(imageData.width, imageData.height);
    }
    id.data.set(new Uint8ClampedArray(imageData.data));
    return id;
  };

  var loadImage = function loadImage(url) {
    return new Promise(function(resolve, reject) {
      var img = new Image();
      img.crossOrigin = 'Anonymous';
      img.onload = function() {
        resolve(img);
      };
      img.onerror = function(e) {
        reject(e);
      };
      img.src = url;
    });
  };

  var createImageWrapperView = function createImageWrapperView(_) {
    // create overlay view
    var OverlayView = createImageOverlayView(_);

    var ImageView = createImageView(_);
    var createWorker = _.utils.createWorker;

    var applyFilter = function applyFilter(root, filter, target) {
      return new Promise(function(resolve) {
        // will store image data for future filter updates
        if (!root.ref.imageData) {
          root.ref.imageData = target
            .getContext('2d')
            .getImageData(0, 0, target.width, target.height);
        }

        // get image data reference
        var imageData = cloneImageData(root.ref.imageData);

        if (!filter || filter.length !== 20) {
          target.getContext('2d').putImageData(imageData, 0, 0);
          return resolve();
        }

        var worker = createWorker(ColorMatrixWorker);
        worker.post(
          {
            imageData: imageData,
            colorMatrix: filter
          },

          function(response) {
            // apply filtered colors
            target.getContext('2d').putImageData(response, 0, 0);

            // stop worker
            worker.terminate();

            // done!
            resolve();
          },
          [imageData.data.buffer]
        );
      });
    };

    var removeImageView = function removeImageView(root, imageView) {
      root.removeChildView(imageView);
      imageView.image.width = 1;
      imageView.image.height = 1;
      imageView._destroy();
    };

    // remove an image
    var shiftImage = function shiftImage(_ref) {
      var root = _ref.root;
      var imageView = root.ref.images.shift();
      imageView.opacity = 0;
      imageView.translateY = -15;
      root.ref.imageViewBin.push(imageView);
      return imageView;
    };

    // add new image
    var pushImage = function pushImage(_ref2) {
      var root = _ref2.root,
        props = _ref2.props,
        image = _ref2.image;
      var id = props.id;
      var item = root.query('GET_ITEM', { id: id });
      if (!item) return;

      var crop = item.getMetadata('crop') || {
        center: {
          x: 0.5,
          y: 0.5
        },

        flip: {
          horizontal: false,
          vertical: false
        },

        zoom: 1,
        rotation: 0,
        aspectRatio: null
      };

      var background = root.query(
        'GET_IMAGE_TRANSFORM_CANVAS_BACKGROUND_COLOR'
      );

      var markup;
      var resize;
      var dirty = false;
      if (root.query('GET_IMAGE_PREVIEW_MARKUP_SHOW')) {
        markup = item.getMetadata('markup') || [];
        resize = item.getMetadata('resize');
        dirty = true;
      }

      // append image presenter
      var imageView = root.appendChildView(
        root.createChildView(ImageView, {
          id: id,
          image: image,
          crop: crop,
          resize: resize,
          markup: markup,
          dirty: dirty,
          background: background,
          opacity: 0,
          scaleX: 1.15,
          scaleY: 1.15,
          translateY: 15
        }),

        root.childViews.length
      );

      root.ref.images.push(imageView);

      // reveal the preview image
      imageView.opacity = 1;
      imageView.scaleX = 1;
      imageView.scaleY = 1;
      imageView.translateY = 0;

      // the preview is now ready to be drawn
      setTimeout(function() {
        root.dispatch('DID_IMAGE_PREVIEW_SHOW', { id: id });
      }, 250);
    };

    var updateImage = function updateImage(_ref3) {
      var root = _ref3.root,
        props = _ref3.props;
      var item = root.query('GET_ITEM', { id: props.id });
      if (!item) return;
      var imageView = root.ref.images[root.ref.images.length - 1];
      imageView.crop = item.getMetadata('crop');
      imageView.background = root.query(
        'GET_IMAGE_TRANSFORM_CANVAS_BACKGROUND_COLOR'
      );

      if (root.query('GET_IMAGE_PREVIEW_MARKUP_SHOW')) {
        imageView.dirty = true;
        imageView.resize = item.getMetadata('resize');
        imageView.markup = item.getMetadata('markup');
      }
    };

    // replace image preview
    var didUpdateItemMetadata = function didUpdateItemMetadata(_ref4) {
      var root = _ref4.root,
        props = _ref4.props,
        action = _ref4.action;
      // only filter and crop trigger redraw
      if (!/crop|filter|markup|resize/.test(action.change.key)) return;

      // no images to update, exit
      if (!root.ref.images.length) return;

      // no item found, exit
      var item = root.query('GET_ITEM', { id: props.id });
      if (!item) return;

      // for now, update existing image when filtering
      if (/filter/.test(action.change.key)) {
        var imageView = root.ref.images[root.ref.images.length - 1];
        applyFilter(root, action.change.value, imageView.image);
        return;
      }

      if (/crop|markup|resize/.test(action.change.key)) {
        var crop = item.getMetadata('crop');
        var image = root.ref.images[root.ref.images.length - 1];

        // if aspect ratio has changed, we need to create a new image
        if (
          crop &&
          crop.aspectRatio &&
          image.crop &&
          image.crop.aspectRatio &&
          Math.abs(crop.aspectRatio - image.crop.aspectRatio) > 0.00001
        ) {
          var _imageView = shiftImage({ root: root });
          pushImage({
            root: root,
            props: props,
            image: cloneCanvas(_imageView.image)
          });
        }
        // if not, we can update the current image
        else {
          updateImage({ root: root, props: props });
        }
      }
    };

    var canCreateImageBitmap = function canCreateImageBitmap(file) {
      // Firefox versions before 58 will freeze when running createImageBitmap
      // in a Web Worker so we detect those versions and return false for support
      var userAgent = window.navigator.userAgent;
      var isFirefox = userAgent.match(/Firefox\/([0-9]+)\./);
      var firefoxVersion = isFirefox ? parseInt(isFirefox[1]) : null;
      if (firefoxVersion <= 58) return false;

      return 'createImageBitmap' in window && isBitmap(file);
    };

    /**
     * Write handler for when preview container has been created
     */
    var didCreatePreviewContainer = function didCreatePreviewContainer(_ref5) {
      var root = _ref5.root,
        props = _ref5.props;
      var id = props.id;

      // we need to get the file data to determine the eventual image size
      var item = root.query('GET_ITEM', id);
      if (!item) return;

      // get url to file (we'll revoke it later on when done)
      var fileURL = URL.createObjectURL(item.file);

      // determine image size of this item
      getImageSize(fileURL, function(width, height) {
        // we can now scale the panel to the final size
        root.dispatch('DID_IMAGE_PREVIEW_CALCULATE_SIZE', {
          id: id,
          width: width,
          height: height
        });
      });
    };

    var drawPreview = function drawPreview(_ref6) {
      var root = _ref6.root,
        props = _ref6.props;
      var id = props.id;

      // we need to get the file data to determine the eventual image size
      var item = root.query('GET_ITEM', id);
      if (!item) return;

      // get url to file (we'll revoke it later on when done)
      var fileURL = URL.createObjectURL(item.file);

      // fallback
      var loadPreviewFallback = function loadPreviewFallback() {
        // let's scale the image in the main thread :(
        loadImage(fileURL).then(previewImageLoaded);
      };

      // image is now ready
      var previewImageLoaded = function previewImageLoaded(imageData) {
        // the file url is no longer needed
        URL.revokeObjectURL(fileURL);

        // draw the scaled down version here and use that as source so bitmapdata can be closed
        // orientation info
        var exif = item.getMetadata('exif') || {};
        var orientation = exif.orientation || -1;

        // get width and height from action, and swap if orientation is incorrect
        var width = imageData.width,
          height = imageData.height;

        // if no width or height, just return early.
        if (!width || !height) return;

        if (orientation >= 5 && orientation <= 8) {
          var _ref7 = [height, width];
          width = _ref7[0];
          height = _ref7[1];
        }

        // scale canvas based on pixel density
        // we multiply by .75 as that creates smaller but still clear images on screens with high res displays
        var pixelDensityFactor = Math.max(1, window.devicePixelRatio * 0.75);

        // we want as much pixels to work with as possible,
        // this multiplies the minimum image resolution,
        // so when zooming in it doesn't get too blurry
        var zoomFactor = root.query('GET_IMAGE_PREVIEW_ZOOM_FACTOR');

        // imaeg scale factor
        var scaleFactor = zoomFactor * pixelDensityFactor;

        // calculate scaled preview image size
        var previewImageRatio = height / width;

        // calculate image preview height and width
        var previewContainerWidth = root.rect.element.width;
        var previewContainerHeight = root.rect.element.height;

        var imageWidth = previewContainerWidth;
        var imageHeight = imageWidth * previewImageRatio;

        if (previewImageRatio > 1) {
          imageWidth = Math.min(width, previewContainerWidth * scaleFactor);
          imageHeight = imageWidth * previewImageRatio;
        } else {
          imageHeight = Math.min(height, previewContainerHeight * scaleFactor);
          imageWidth = imageHeight / previewImageRatio;
        }

        // transfer to image tag so no canvas memory wasted on iOS
        var previewImage = createPreviewImage(
          imageData,
          imageWidth,
          imageHeight,
          orientation
        );

        // done
        var done = function done() {
          // calculate average image color, disabled for now
          var averageColor = root.query(
            'GET_IMAGE_PREVIEW_CALCULATE_AVERAGE_IMAGE_COLOR'
          )
            ? calculateAverageColor(data)
            : null;
          item.setMetadata('color', averageColor, true);

          // data has been transferred to canvas ( if was ImageBitmap )
          if ('close' in imageData) {
            imageData.close();
          }

          // show the overlay
          root.ref.overlayShadow.opacity = 1;

          // create the first image
          pushImage({ root: root, props: props, image: previewImage });
        };

        // apply filter
        var filter = item.getMetadata('filter');
        if (filter) {
          applyFilter(root, filter, previewImage).then(done);
        } else {
          done();
        }
      };

      // if we support scaling using createImageBitmap we use a worker
      if (canCreateImageBitmap(item.file)) {
        // let's scale the image in a worker
        var worker = createWorker(BitmapWorker);

        worker.post(
          {
            file: item.file
          },

          function(imageBitmap) {
            // destroy worker
            worker.terminate();

            // no bitmap returned, must be something wrong,
            // try the oldschool way
            if (!imageBitmap) {
              loadPreviewFallback();
              return;
            }

            // yay we got our bitmap, let's continue showing the preview
            previewImageLoaded(imageBitmap);
          }
        );
      } else {
        // create fallback preview
        loadPreviewFallback();
      }
    };

    /**
     * Write handler for when the preview image is ready to be animated
     */
    var didDrawPreview = function didDrawPreview(_ref8) {
      var root = _ref8.root;
      // get last added image
      var image = root.ref.images[root.ref.images.length - 1];
      image.translateY = 0;
      image.scaleX = 1.0;
      image.scaleY = 1.0;
      image.opacity = 1;
    };

    /**
     * Write handler for when the preview has been loaded
     */
    var restoreOverlay = function restoreOverlay(_ref9) {
      var root = _ref9.root;
      root.ref.overlayShadow.opacity = 1;
      root.ref.overlayError.opacity = 0;
      root.ref.overlaySuccess.opacity = 0;
    };

    var didThrowError = function didThrowError(_ref10) {
      var root = _ref10.root;
      root.ref.overlayShadow.opacity = 0.25;
      root.ref.overlayError.opacity = 1;
    };

    var didCompleteProcessing = function didCompleteProcessing(_ref11) {
      var root = _ref11.root;
      root.ref.overlayShadow.opacity = 0.25;
      root.ref.overlaySuccess.opacity = 1;
    };

    /**
     * Constructor
     */
    var create = function create(_ref12) {
      var root = _ref12.root;
      // image view
      root.ref.images = [];

      // the preview image data (we need this to filter the image)
      root.ref.imageData = null;

      // image bin
      root.ref.imageViewBin = [];

      // image overlays
      root.ref.overlayShadow = root.appendChildView(
        root.createChildView(OverlayView, {
          opacity: 0,
          status: 'idle'
        })
      );

      root.ref.overlaySuccess = root.appendChildView(
        root.createChildView(OverlayView, {
          opacity: 0,
          status: 'success'
        })
      );

      root.ref.overlayError = root.appendChildView(
        root.createChildView(OverlayView, {
          opacity: 0,
          status: 'failure'
        })
      );
    };

    return _.utils.createView({
      name: 'image-preview-wrapper',
      create: create,
      styles: ['height'],
      apis: ['height'],
      destroy: function destroy(_ref13) {
        var root = _ref13.root;
        // we resize the image so memory on iOS 12 is released more quickly (it seems)
        root.ref.images.forEach(function(imageView) {
          imageView.image.width = 1;
          imageView.image.height = 1;
        });
      },
      didWriteView: function didWriteView(_ref14) {
        var root = _ref14.root;
        root.ref.images.forEach(function(imageView) {
          imageView.dirty = false;
        });
      },
      write: _.utils.createRoute(
        {
          // image preview stated
          DID_IMAGE_PREVIEW_DRAW: didDrawPreview,
          DID_IMAGE_PREVIEW_CONTAINER_CREATE: didCreatePreviewContainer,
          DID_FINISH_CALCULATE_PREVIEWSIZE: drawPreview,
          DID_UPDATE_ITEM_METADATA: didUpdateItemMetadata,

          // file states
          DID_THROW_ITEM_LOAD_ERROR: didThrowError,
          DID_THROW_ITEM_PROCESSING_ERROR: didThrowError,
          DID_THROW_ITEM_INVALID: didThrowError,
          DID_COMPLETE_ITEM_PROCESSING: didCompleteProcessing,
          DID_START_ITEM_PROCESSING: restoreOverlay,
          DID_REVERT_ITEM_PROCESSING: restoreOverlay
        },

        function(_ref15) {
          var root = _ref15.root;
          // views on death row
          var viewsToRemove = root.ref.imageViewBin.filter(function(imageView) {
            return imageView.opacity === 0;
          });

          // views to retain
          root.ref.imageViewBin = root.ref.imageViewBin.filter(function(
            imageView
          ) {
            return imageView.opacity > 0;
          });

          // remove these views
          viewsToRemove.forEach(function(imageView) {
            return removeImageView(root, imageView);
          });
          viewsToRemove.length = 0;
        }
      )
    });
  };

  /**
   * Image Preview Plugin
   */
  var plugin = function plugin(fpAPI) {
    var addFilter = fpAPI.addFilter,
      utils = fpAPI.utils;
    var Type = utils.Type,
      createRoute = utils.createRoute,
      isFile = utils.isFile;

    // imagePreviewView
    var imagePreviewView = createImageWrapperView(fpAPI);

    // called for each view that is created right after the 'create' method
    addFilter('CREATE_VIEW', function(viewAPI) {
      // get reference to created view
      var is = viewAPI.is,
        view = viewAPI.view,
        query = viewAPI.query;

      // only hook up to item view and only if is enabled for this cropper
      if (!is('file') || !query('GET_ALLOW_IMAGE_PREVIEW')) return;

      // create the image preview plugin, but only do so if the item is an image
      var didLoadItem = function didLoadItem(_ref) {
        var root = _ref.root,
          props = _ref.props;
        var id = props.id;
        var item = query('GET_ITEM', id);

        // item could theoretically have been removed in the mean time
        if (!item || !isFile(item.file) || item.archived) return;

        // get the file object
        var file = item.file;

        // exit if this is not an image
        if (!isPreviewableImage(file)) return;

        // test if is filtered
        if (!query('GET_IMAGE_PREVIEW_FILTER_ITEM')(item)) return;

        // exit if image size is too high and no createImageBitmap support
        // this would simply bring the browser to its knees and that is not what we want
        var supportsCreateImageBitmap = 'createImageBitmap' in (window || {});
        var maxPreviewFileSize = query('GET_IMAGE_PREVIEW_MAX_FILE_SIZE');
        if (
          !supportsCreateImageBitmap &&
          maxPreviewFileSize &&
          file.size > maxPreviewFileSize
        )
          return;

        // set preview view
        root.ref.imagePreview = view.appendChildView(
          view.createChildView(imagePreviewView, { id: id })
        );

        // update height if is fixed
        var fixedPreviewHeight = root.query('GET_IMAGE_PREVIEW_HEIGHT');
        if (fixedPreviewHeight) {
          root.dispatch('DID_UPDATE_PANEL_HEIGHT', {
            id: item.id,
            height: fixedPreviewHeight
          });
        }

        // now ready
        var queue =
          !supportsCreateImageBitmap &&
          file.size > query('GET_IMAGE_PREVIEW_MAX_INSTANT_PREVIEW_FILE_SIZE');
        root.dispatch('DID_IMAGE_PREVIEW_CONTAINER_CREATE', { id: id }, queue);
      };

      var rescaleItem = function rescaleItem(root, props) {
        if (!root.ref.imagePreview) return;
        var id = props.id;

        // get item
        var item = root.query('GET_ITEM', { id: id });
        if (!item) return;

        // if is fixed height or panel has aspect ratio, exit here, height has already been defined
        var panelAspectRatio = root.query('GET_PANEL_ASPECT_RATIO');
        var itemPanelAspectRatio = root.query('GET_ITEM_PANEL_ASPECT_RATIO');
        var fixedHeight = root.query('GET_IMAGE_PREVIEW_HEIGHT');
        if (panelAspectRatio || itemPanelAspectRatio || fixedHeight) return;

        // no data!
        var _root$ref = root.ref,
          imageWidth = _root$ref.imageWidth,
          imageHeight = _root$ref.imageHeight;
        if (!imageWidth || !imageHeight) return;

        // get height min and max
        var minPreviewHeight = root.query('GET_IMAGE_PREVIEW_MIN_HEIGHT');
        var maxPreviewHeight = root.query('GET_IMAGE_PREVIEW_MAX_HEIGHT');

        // orientation info
        var exif = item.getMetadata('exif') || {};
        var orientation = exif.orientation || -1;

        // get width and height from action, and swap of orientation is incorrect
        if (orientation >= 5 && orientation <= 8) {
          var _ref2 = [imageHeight, imageWidth];
          imageWidth = _ref2[0];
          imageHeight = _ref2[1];
        }

        // scale up width and height when we're dealing with an SVG
        if (!isBitmap(item.file) || root.query('GET_IMAGE_PREVIEW_UPSCALE')) {
          var scalar = 2048 / imageWidth;
          imageWidth *= scalar;
          imageHeight *= scalar;
        }

        // image aspect ratio
        var imageAspectRatio = imageHeight / imageWidth;

        // we need the item to get to the crop size
        var previewAspectRatio =
          (item.getMetadata('crop') || {}).aspectRatio || imageAspectRatio;

        // preview height range
        var previewHeightMax = Math.max(
          minPreviewHeight,
          Math.min(imageHeight, maxPreviewHeight)
        );

        var itemWidth = root.rect.element.width;
        var previewHeight = Math.min(
          itemWidth * previewAspectRatio,
          previewHeightMax
        );

        // request update to panel height
        root.dispatch('DID_UPDATE_PANEL_HEIGHT', {
          id: item.id,
          height: previewHeight
        });
      };

      var didResizeView = function didResizeView(_ref3) {
        var root = _ref3.root;
        // actions in next write operation
        root.ref.shouldRescale = true;
      };

      var didUpdateItemMetadata = function didUpdateItemMetadata(_ref4) {
        var root = _ref4.root,
          action = _ref4.action;
        if (action.change.key !== 'crop') return;

        // actions in next write operation
        root.ref.shouldRescale = true;
      };

      var didCalculatePreviewSize = function didCalculatePreviewSize(_ref5) {
        var root = _ref5.root,
          action = _ref5.action;
        // remember dimensions
        root.ref.imageWidth = action.width;
        root.ref.imageHeight = action.height;

        // actions in next write operation
        root.ref.shouldRescale = true;
        root.ref.shouldDrawPreview = true;

        // as image load could take a while and fire when draw loop is resting we need to give it a kick
        root.dispatch('KICK');
      };

      // start writing
      view.registerWriter(
        createRoute(
          {
            DID_RESIZE_ROOT: didResizeView,
            DID_STOP_RESIZE: didResizeView,
            DID_LOAD_ITEM: didLoadItem,
            DID_IMAGE_PREVIEW_CALCULATE_SIZE: didCalculatePreviewSize,
            DID_UPDATE_ITEM_METADATA: didUpdateItemMetadata
          },

          function(_ref6) {
            var root = _ref6.root,
              props = _ref6.props;
            // no preview view attached
            if (!root.ref.imagePreview) return;

            // don't do anything while hidden
            if (root.rect.element.hidden) return;

            // resize the item panel
            if (root.ref.shouldRescale) {
              rescaleItem(root, props);
              root.ref.shouldRescale = false;
            }

            if (root.ref.shouldDrawPreview) {
              // queue till next frame so we're sure the height has been applied this forces the draw image call inside the wrapper view to use the correct height
              requestAnimationFrame(function() {
                // this requestAnimationFrame nesting is horrible but it fixes an issue with 100hz displays on Chrome
                // https://github.com/pqina/filepond-plugin-image-preview/issues/57
                requestAnimationFrame(function() {
                  root.dispatch('DID_FINISH_CALCULATE_PREVIEWSIZE', {
                    id: props.id
                  });
                });
              });

              root.ref.shouldDrawPreview = false;
            }
          }
        )
      );
    });

    // expose plugin
    return {
      options: {
        // Enable or disable image preview
        allowImagePreview: [true, Type.BOOLEAN],

        // filters file items to determine which are shown as preview
        imagePreviewFilterItem: [
          function() {
            return true;
          },
          Type.FUNCTION
        ],

        // Fixed preview height
        imagePreviewHeight: [null, Type.INT],

        // Min image height
        imagePreviewMinHeight: [44, Type.INT],

        // Max image height
        imagePreviewMaxHeight: [256, Type.INT],

        // Max size of preview file for when createImageBitmap is not supported
        imagePreviewMaxFileSize: [null, Type.INT],

        // The amount of extra pixels added to the image preview to allow comfortable zooming
        imagePreviewZoomFactor: [2, Type.INT],

        // Should we upscale small images to fit the max bounding box of the preview area
        imagePreviewUpscale: [false, Type.BOOLEAN],

        // Max size of preview file that we allow to try to instant preview if createImageBitmap is not supported, else image is queued for loading
        imagePreviewMaxInstantPreviewFileSize: [1000000, Type.INT],

        // Style of the transparancy indicator used behind images
        imagePreviewTransparencyIndicator: [null, Type.STRING],

        // Enables or disables reading average image color
        imagePreviewCalculateAverageImageColor: [false, Type.BOOLEAN],

        // Enables or disables the previewing of markup
        imagePreviewMarkupShow: [true, Type.BOOLEAN],

        // Allows filtering of markup to only show certain shapes
        imagePreviewMarkupFilter: [
          function() {
            return true;
          },
          Type.FUNCTION
        ]
      }
    };
  };

  // fire pluginloaded event if running in browser, this allows registering the plugin when using async script tags
  var isBrowser =
    typeof window !== 'undefined' && typeof window.document !== 'undefined';
  if (isBrowser) {
    document.dispatchEvent(
      new CustomEvent('FilePond:pluginloaded', { detail: plugin })
    );
  }

  return plugin;
});