player/js/worker_wrapper.js

function workerContent() {
  function extendPrototype(sources, destination) {
    var i;
    var len = sources.length;
    var sourcePrototype;
    for (i = 0; i < len; i += 1) {
      sourcePrototype = sources[i].prototype;
      for (var attr in sourcePrototype) {
        if (Object.prototype.hasOwnProperty.call(sourcePrototype, attr)) destination.prototype[attr] = sourcePrototype[attr];
      }
    }
  }
  function ProxyElement(type, namespace) {
    this._state = 'init';
    this._isDirty = false;
    this._isProxy = true;
    this._changedStyles = [];
    this._changedAttributes = [];
    this._changedElements = [];
    this._textContent = null;
    this.type = type;
    this.namespace = namespace;
    this.children = [];
    localIdCounter += 1;
    this.attributes = {
      id: 'l_d_' + localIdCounter,
    };
    this.style = new Style(this);
  }
  ProxyElement.prototype = {
    appendChild: function (_child) {
      _child.parentNode = this;
      this.children.push(_child);
      this._isDirty = true;
      this._changedElements.push([_child, this.attributes.id]);
    },

    insertBefore: function (_newElement, _nextElement) {
      var children = this.children;
      for (var i = 0; i < children.length; i += 1) {
        if (children[i] === _nextElement) {
          children.splice(i, 0, _newElement);
          this._isDirty = true;
          this._changedElements.push([_newElement, this.attributes.id, _nextElement.attributes.id]);
          return;
        }
      }
      children.push(_nextElement);
    },

    setAttribute: function (_attribute, _value) {
      this.attributes[_attribute] = _value;
      if (!this._isDirty) {
        this._isDirty = true;
      }
      this._changedAttributes.push(_attribute);
    },

    serialize: function () {
      return {
        type: this.type,
        namespace: this.namespace,
        style: this.style.serialize(),
        attributes: this.attributes,
        children: this.children.map(function (child) { return child.serialize(); }),
        textContent: this._textContent,
      };
    },

    // eslint-disable-next-line class-methods-use-this
    addEventListener: function (_, _callback) {
      setTimeout(_callback, 1);
    },

    setAttributeNS: function (_, _attribute, _value) {
      this.attributes[_attribute] = _value;
      if (!this._isDirty) {
        this._isDirty = true;
      }
      this._changedAttributes.push(_attribute);
    },

  };

  Object.defineProperty(ProxyElement.prototype, 'textContent', {
    set: function (_value) {
      this._isDirty = true;
      this._textContent = _value;
    },
  });

  var localIdCounter = 0;
  var animations = {};

  var styleProperties = ['width', 'height', 'display', 'transform', 'opacity', 'contentVisibility', 'mix-blend-mode'];

  function convertArguments(args) {
    var arr = [];
    var i;
    var len = args.length;
    for (i = 0; i < len; i += 1) {
      arr.push(args[i]);
    }
    return arr;
  }

  function Style(element) {
    this.element = element;
  }
  Style.prototype = {
    serialize: function () {
      var obj = {};
      for (var i = 0; i < styleProperties.length; i += 1) {
        var propertyKey = styleProperties[i];
        var keyName = '_' + propertyKey;
        if (keyName in this) {
          obj[propertyKey] = this[keyName];
        }
      }
      return obj;
    },
  };
  styleProperties.forEach(function (propertyKey) {
    Object.defineProperty(Style.prototype, propertyKey, {
      set: function (value) {
        if (!this.element._isDirty) {
          this.element._isDirty = true;
        }
        this.element._changedStyles.push(propertyKey);
        var keyName = '_' + propertyKey;
        this[keyName] = value;
      },
      get: function () {
        var keyName = '_' + propertyKey;
        return this[keyName];
      },
    });
  });

  function CanvasContext(element) {
    this.element = element;
  }

  CanvasContext.prototype = {
    createRadialGradient: function () {
      function addColorStop() {
        instruction.stops.push(convertArguments(arguments));
      }
      var instruction = {
        t: 'rGradient',
        a: convertArguments(arguments),
        stops: [],
      };
      this.element.instructions.push(instruction);
      return {
        addColorStop: addColorStop,
      };
    },

    createLinearGradient: function () {
      function addColorStop() {
        instruction.stops.push(convertArguments(arguments));
      }
      var instruction = {
        t: 'lGradient',
        a: convertArguments(arguments),
        stops: [],
      };
      this.element.instructions.push(instruction);
      return {
        addColorStop: addColorStop,
      };
    },

  };

  Object.defineProperties(CanvasContext.prototype, {
    canvas: {
      enumerable: true,
      get: function () {
        return this.element;
      },
    },
  });

  var canvasContextMethods = [
    'fillRect',
    'setTransform',
    'drawImage',
    'beginPath',
    'moveTo',
    'save',
    'restore',
    'fillText',
    'setLineDash',
    'clearRect',
    'clip',
    'rect',
    'stroke',
    'fill',
    'closePath',
    'bezierCurveTo',
    'lineTo',
  ];

  canvasContextMethods.forEach(function (method) {
    CanvasContext.prototype[method] = function () {
      this.element.instructions.push({
        t: method,
        a: convertArguments(arguments),
      });
    };
  });

  var canvasContextProperties = [
    'globalAlpha',
    'strokeStyle',
    'fillStyle',
    'lineCap',
    'lineJoin',
    'lineWidth',
    'miterLimit',
    'lineDashOffset',
    'globalCompositeOperation',
  ];

  canvasContextProperties.forEach(function (property) {
    Object.defineProperty(CanvasContext.prototype, property,
      {
        set: function (_value) {
          this.element.instructions.push({
            t: property,
            a: _value,
          });
        },
      });
  });

  function CanvasElement(type, namespace) {
    ProxyElement.call(this, type, namespace);
    this.instructions = [];
    this.width = 0;
    this.height = 0;
    this.context = new CanvasContext(this);
  }

  CanvasElement.prototype = {

    getContext: function () {
      return this.context;
    },

    resetInstructions: function () {
      this.instructions.length = 0;
    },
  };
  extendPrototype([ProxyElement], CanvasElement);

  function createElement(namespace, type) {
    if (type === 'canvas') {
      return new CanvasElement(type, namespace);
    }
    return new ProxyElement(type, namespace);
  }

  var window = self; // eslint-disable-line no-redeclare, no-unused-vars

  var document = { // eslint-disable-line no-redeclare
    createElementNS: function (namespace, type) {
      return createElement(namespace, type);
    },
    createElement: function (type) {
      return createElement('', type);
    },
    getElementsByTagName: function () {
      return [];
    },
    body: createElement('', 'body'),
    _isProxy: true,
  };
  /* eslint-enable */
  var lottieInternal = (function () {
    'use strict';

    /* <%= contents %> */

    function addElementToList(element, list) {
      list.push(element);
      element._isDirty = false;
      element._changedStyles.length = 0;
      element._changedAttributes.length = 0;
      element._changedElements.length = 0;
      element._textContent = null;
      element.children.forEach(function (child) {
        addElementToList(child, list);
      });
    }

    function addChangedAttributes(element) {
      var changedAttributes = element._changedAttributes;
      var attributes = [];
      var attribute;
      for (var i = 0; i < changedAttributes.length; i += 1) {
        attribute = changedAttributes[i];
        attributes.push([attribute, element.attributes[attribute]]);
      }
      return attributes;
    }

    function addChangedStyles(element) {
      var changedStyles = element._changedStyles;
      var styles = [];
      var style;
      for (var i = 0; i < changedStyles.length; i += 1) {
        style = changedStyles[i];
        styles.push([style, element.style[style]]);
      }
      return styles;
    }

    function addChangedElements(element, elements) {
      var changedElements = element._changedElements;
      var elementsList = [];
      var elementData;
      for (var i = 0; i < changedElements.length; i += 1) {
        elementData = changedElements[i];
        elementsList.push([elementData[0].serialize(), elementData[1], elementData[2]]);
        addElementToList(elementData[0], elements);
      }
      return elementsList;
    }

    function loadAnimation(payload) {
      var params = payload.params;
      var wrapper;
      var animation;
      var elements = [];
      var canvas;
      if (params.renderer === 'svg') {
        wrapper = document.createElement('div');
        params.container = wrapper;
      } else {
        canvas = params.rendererSettings.canvas;
        if (!canvas) {
          canvas = document.createElement('canvas');
          canvas.width = params.animationData.w;
          canvas.height = params.animationData.h;
        }
        var ctx = canvas.getContext('2d');
        params.rendererSettings.context = ctx;
      }
      animation = lottie.loadAnimation(params);
      animation.addEventListener('error', function (error) {
        console.log(error); // eslint-disable-line
      });
      animation.onError = function (error) {
        console.log('ERRORO', error); // eslint-disable-line
      };
      animation.addEventListener('_play', function () {
        self.postMessage({
          type: 'playing',
          payload: {
            id: payload.id,
          },
        });
      });
      animation.addEventListener('_pause', function () {
        self.postMessage({
          type: 'paused',
          payload: {
            id: payload.id,
          },
        });
      });
      if (params.renderer === 'svg') {
        animation.addEventListener('DOMLoaded', function () {
          var serialized = wrapper.serialize();
          addElementToList(wrapper, elements);
          self.postMessage({
            type: 'SVGloaded',
            payload: {
              id: payload.id,
              tree: serialized.children[0],
            },
          });
        });
        animation.addEventListener('drawnFrame', function (event) {
          var changedElements = [];
          var element;
          for (var i = 0; i < elements.length; i += 1) {
            element = elements[i];
            if (element._isDirty) {
              var changedElement = {
                id: element.attributes.id,
                styles: addChangedStyles(element),
                attributes: addChangedAttributes(element),
                elements: addChangedElements(element, elements),
                textContent: element._textContent || undefined,
              };
              changedElements.push(changedElement);
              element._isDirty = false;
              element._changedAttributes.length = 0;
              element._changedStyles.length = 0;
              element._changedElements.length = 0;
              element._textContent = null;
            }
          }
          self.postMessage({
            type: 'SVGupdated',
            payload: {
              elements: changedElements,
              id: payload.id,
              currentTime: event.currentTime,
            },
          });
        });
      } else if (canvas._isProxy) {
        animation.addEventListener('drawnFrame', function (event) {
          self.postMessage({
            type: 'CanvasUpdated',
            payload: {
              instructions: canvas.instructions,
              id: payload.id,
              currentTime: event.currentTime,
            },
          });
          canvas.resetInstructions();
        });
      }
      animation.addEventListener('DOMLoaded', function () {
        self.postMessage({
          type: 'DOMLoaded',
          payload: {
            id: payload.id,
            totalFrames: animation.totalFrames,
            frameRate: animation.frameRate,
            firstFrame: animation.firstFrame,
            currentFrame: animation.currentFrame,
            playDirection: animation.playDirection,
            isSubframeEnabled: animation.isSubframeEnabled,
            currentRawFrame: animation.currentRawFrame,
            timeCompleted: animation.timeCompleted,
          },
        });
      });
      animations[payload.id] = {
        animation: animation,
        events: {},
      };
    }

    return {
      loadAnimation: loadAnimation,
    };
  }({}));
  onmessage = function (evt) {
    var data = evt.data;
    var type = data.type;
    var payload = data.payload;
    if (type === 'load') {
      lottieInternal.loadAnimation(payload);
    } else if (type === 'pause') {
      if (animations[payload.id]) {
        animations[payload.id].animation.pause();
      }
    } else if (type === 'play') {
      if (animations[payload.id]) {
        animations[payload.id].animation.play();
      }
    } else if (type === 'stop') {
      if (animations[payload.id]) {
        animations[payload.id].animation.stop();
      }
    } else if (type === 'setSpeed') {
      if (animations[payload.id]) {
        animations[payload.id].animation.setSpeed(payload.value);
      }
    } else if (type === 'setDirection') {
      if (animations[payload.id]) {
        animations[payload.id].animation.setDirection(payload.value);
      }
    } else if (type === 'setLoop') {
      if (animations[payload.id]) {
        animations[payload.id].animation.setLoop(payload.value);
      }
    } else if (type === 'goToAndPlay') {
      if (animations[payload.id]) {
        animations[payload.id].animation.goToAndPlay(payload.value, payload.isFrame);
      }
    } else if (type === 'goToAndStop') {
      if (animations[payload.id]) {
        animations[payload.id].animation.goToAndStop(payload.value, payload.isFrame);
      }
    } else if (type === 'setSubframe') {
      if (animations[payload.id]) {
        animations[payload.id].animation.setSubframe(payload.value);
      }
    } else if (type === 'addEventListener') {
      if (animations[payload.id]) {
        var eventCallback = function () {
          self.postMessage({
            type: 'event',
            payload: {
              id: payload.id,
              callbackId: payload.callbackId,
              argument: arguments[0],
            },
          });
        };
        animations[payload.id].events[payload.callbackId] = {
          callback: eventCallback,
        };
        animations[payload.id].animation.addEventListener(payload.eventName, eventCallback);
      }
    } else if (type === 'removeEventListener') {
      if (animations[payload.id]) {
        var callback = animations[payload.id].events[payload.callbackId];
        animations[payload.id].animation.removeEventListener(payload.eventName, callback);
      }
    } else if (type === 'destroy') {
      if (animations[payload.id]) {
        animations[payload.id].animation.destroy();
        animations[payload.id] = null;
      }
    } else if (type === 'resize') {
      if (animations[payload.id]) {
        animations[payload.id].animation.resize(payload.width, payload.height);
      }
    } else if (type === 'playSegments') {
      if (animations[payload.id]) {
        animations[payload.id].animation.playSegments(payload.arr, payload.forceFlag);
      }
    } else if (type === 'resetSegments') {
      if (animations[payload.id]) {
        animations[payload.id].animation.resetSegments(payload.forceFlag);
      }
    } else if (type === 'updateDocumentData') {
      animations[payload.id].animation.updateDocumentData(payload.path, payload.documentData, payload.index);
    }
  };
}

function createWorker(fn) {
  var blob = new Blob(['(' + fn.toString() + '())'], { type: 'text/javascript' });
  var url = URL.createObjectURL(blob);
  return new Worker(url);
}
// eslint-disable-next-line no-unused-vars
var lottie = (function () {
  'use strict';

  var workerInstance = createWorker(workerContent);
  var animationIdCounter = 0;
  var eventsIdCounter = 0;
  var animations = {};
  var defaultSettings = {
    rendererSettings: {},
  };

  function createTree(data, container, map, afterElement) {
    var elem;
    if (data.type === 'div') {
      elem = document.createElement('div');
    } else {
      elem = document.createElementNS(data.namespace, data.type);
    }
    if (data.textContent) {
      elem.textContent = data.textContent;
    }
    for (var attr in data.attributes) {
      if (Object.prototype.hasOwnProperty.call(data.attributes, attr)) {
        if (attr === 'href') {
          elem.setAttributeNS('http://www.w3.org/1999/xlink', attr, data.attributes[attr]);
        } else {
          elem.setAttribute(attr, data.attributes[attr]);
        }
        if (attr === 'id') {
          map[data.attributes[attr]] = elem;
        }
      }
    }
    for (var style in data.style) {
      if (Object.prototype.hasOwnProperty.call(data.style, style)) {
        elem.style[style] = data.style[style];
      }
    }
    data.children.forEach(function (element) {
      createTree(element, elem, map);
    });
    if (!afterElement) {
      container.appendChild(elem);
    } else {
      container.insertBefore(elem, afterElement);
    }
  }

  var handleAnimationLoaded = (function () {
    return function (payload) {
      var animation = animations[payload.id];
      animation._loaded = true;
      // if callbacks have been added before the animation has loaded
      animation.pendingCallbacks.forEach(function (callbackData) {
        animation.animInstance.addEventListener(callbackData.eventName, callbackData.callback);
        if (callbackData.eventName === 'DOMLoaded') {
          callbackData.callback();
        }
      });
      animation.animInstance.totalFrames = payload.totalFrames;
      animation.animInstance.frameRate = payload.frameRate;
      animation.animInstance.firstFrame = payload.firstFrame;
      animation.animInstance.playDirection = payload.playDirection;
      animation.animInstance.currentFrame = payload.isSubframeEnabled ? payload.currentRawFrame : ~~payload.currentRawFrame; // eslint-disable-line no-bitwise

      if (payload.timeCompleted !== payload.totalFrames && payload.currentFrame > payload.timeCompleted) {
        animation.animInstance.currentFrame = payload.timeCompleted;
      }
    };
  }());

  var handleSVGLoaded = (function () {
    return function (payload) {
      var animation = animations[payload.id];
      var container = animation.container;
      var elements = animation.elements;
      createTree(payload.tree, container, elements);
    };
  }());

  function addNewElements(newElements, elements) {
    var element;
    for (var i = 0; i < newElements.length; i += 1) {
      element = newElements[i];
      var parent = elements[element[1]];
      if (parent) {
        var sibling;
        if (element[2]) {
          sibling = elements[element[2]];
        }
        createTree(element[0], parent, elements, sibling);
        newElements.splice(i, 1);
        i -= 1;
      }
    }
  }

  function updateElementStyles(element, styles) {
    var style;
    for (var i = 0; i < styles.length; i += 1) {
      style = styles[i];
      element.style[style[0]] = style[1];
    }
  }

  function updateElementAttributes(element, attributes) {
    var attribute;
    for (var i = 0; i < attributes.length; i += 1) {
      attribute = attributes[i];
      element.setAttribute(attribute[0], attribute[1]);
    }
  }

  function updateTextContent(element, text) {
    if (text) {
      element.textContent = text;
    }
  }

  function handleAnimationUpdate(payload) {
    var changedElements = payload.elements;
    var animation = animations[payload.id];
    if (animation) {
      var elements = animation.elements;
      var elementData;
      for (var i = 0; i < changedElements.length; i += 1) {
        elementData = changedElements[i];
        var element = elements[elementData.id];
        addNewElements(elementData.elements, elements);
        updateElementStyles(element, elementData.styles);
        updateElementAttributes(element, elementData.attributes);
        updateTextContent(element, elementData.textContent);
      }
      animation.animInstance.currentFrame = payload.currentTime;
    }
  }

  function createInstructionsHandler(canvas) {
    var ctx = canvas.getContext('2d');
    var map = {
      beginPath: ctx.beginPath,
      closePath: ctx.closePath,
      rect: ctx.rect,
      clip: ctx.clip,
      clearRect: ctx.clearRect,
      setTransform: ctx.setTransform,
      moveTo: ctx.moveTo,
      bezierCurveTo: ctx.bezierCurveTo,
      lineTo: ctx.lineTo,
      fill: ctx.fill,
      save: ctx.save,
      restore: ctx.restore,
    };
    return function (instructions) {
      for (var i = 0; i < instructions.length; i += 1) {
        var instruction = instructions[i];
        var fn = map[instruction.t];
        if (fn) {
          fn.apply(ctx, instruction.a);
        } else {
          ctx[instruction.t] = instruction.a;
        }
      }
    };
  }

  function handleCanvasAnimationUpdate(payload) {
    var animation = animations[payload.id];
    animation.instructionsHandler(payload.instructions);
  }

  function handleEvent(payload) {
    var animation = animations[payload.id];
    if (animation) {
      var callbacks = animation.callbacks;
      if (callbacks[payload.callbackId]) {
        callbacks[payload.callbackId].callback(payload.argument);
      }
    }
  }

  function handlePlaying(payload) {
    var animation = animations[payload.id];
    if (animation) {
      animation.animInstance.isPaused = false;
    }
  }

  function handlePaused(payload) {
    var animation = animations[payload.id];
    if (animation) {
      animation.animInstance.isPaused = true;
    }
  }

  var messageHandlers = {
    DOMLoaded: handleAnimationLoaded,
    SVGloaded: handleSVGLoaded,
    SVGupdated: handleAnimationUpdate,
    CanvasUpdated: handleCanvasAnimationUpdate,
    event: handleEvent,
    playing: handlePlaying,
    paused: handlePaused,
  };

  workerInstance.onmessage = function (event) {
    if (messageHandlers[event.data.type]) {
      messageHandlers[event.data.type](event.data.payload);
    }
  };

  function resolveAnimationData(params) {
    return new Promise(function (resolve, reject) {
      var paramsCopy = Object.assign({}, defaultSettings, params);
      if (paramsCopy.animType && !paramsCopy.renderer) {
        paramsCopy.renderer = paramsCopy.animType;
      }
      if (paramsCopy.wrapper) {
        if (!paramsCopy.container) {
          paramsCopy.container = paramsCopy.wrapper;
        }
        delete paramsCopy.wrapper;
      }
      if (paramsCopy.animationData) {
        resolve(paramsCopy);
      } else if (paramsCopy.path) {
        fetch(paramsCopy.path)
          .then(function (response) {
            return response.json();
          })
          .then(function (animationData) {
            paramsCopy.animationData = animationData;
            delete paramsCopy.path;
            resolve(paramsCopy);
          });
      } else {
        reject();
      }
    });
  }

  function loadAnimation(params) {
    animationIdCounter += 1;
    var animationId = 'lottie_animationId_' + animationIdCounter;
    var animation = {
      elements: {},
      callbacks: {},
      pendingCallbacks: [],
      status: 'init',
    };
    var animInstance = {
      id: animationId,
      isPaused: true,
      pause: function () {
        workerInstance.postMessage({
          type: 'pause',
          payload: {
            id: animationId,
          },
        });
      },
      play: function () {
        workerInstance.postMessage({
          type: 'play',
          payload: {
            id: animationId,
          },
        });
      },
      stop: function () {
        workerInstance.postMessage({
          type: 'stop',
          payload: {
            id: animationId,
          },
        });
      },
      setSpeed: function (value) {
        workerInstance.postMessage({
          type: 'setSpeed',
          payload: {
            id: animationId,
            value: value,
          },
        });
      },
      setDirection: function (value) {
        workerInstance.postMessage({
          type: 'setDirection',
          payload: {
            id: animationId,
            value: value,
          },
        });
      },
      setLoop: function (value) {
        workerInstance.postMessage({
          type: 'setLoop',
          payload: {
            id: animationId,
            value: value,
          },
        });
      },
      goToAndStop: function (value, isFrame) {
        workerInstance.postMessage({
          type: 'goToAndStop',
          payload: {
            id: animationId,
            value: value,
            isFrame: isFrame,
          },
        });
      },
      goToAndPlay: function (value, isFrame) {
        workerInstance.postMessage({
          type: 'goToAndPlay',
          payload: {
            id: animationId,
            value: value,
            isFrame: isFrame,
          },
        });
      },
      playSegments: function (arr, forceFlag) {
        workerInstance.postMessage({
          type: 'playSegments',
          payload: {
            id: animationId,
            arr: arr,
            forceFlag: forceFlag,
          },
        });
      },
      setSubframe: function (value) {
        workerInstance.postMessage({
          type: 'setSubframe',
          payload: {
            id: animationId,
            value: value,
          },
        });
      },
      addEventListener: function (eventName, callback) {
        if (!animation._loaded) {
          animation.pendingCallbacks.push({
            eventName: eventName,
            callback: callback,
          });
        } else {
          eventsIdCounter += 1;
          var callbackId = 'callback_' + eventsIdCounter;
          animation.callbacks[callbackId] = {
            eventName: eventName,
            callback: callback,
          };
          workerInstance.postMessage({
            type: 'addEventListener',
            payload: {
              id: animationId,
              callbackId: callbackId,
              eventName: eventName,
            },
          });
        }
      },
      removeEventListener: function (eventName, callback) {
        Object.keys(animation.callbacks)
          .forEach(function (key) {
            if (animation.callbacks[key].eventName === eventName
              && (animation.callbacks[key].callback === callback || !callback)) {
              delete animation.callbacks[key];
              workerInstance.postMessage({
                type: 'removeEventListener',
                payload: {
                  id: animationId,
                  callbackId: key,
                  eventName: eventName,
                },
              });
            }
          });
      },
      destroy: function () {
        if (animation.status === 'init') {
          animation.status = 'destroyable';
        } else {
          animation.status = 'destroyed';
          animations[animationId] = null;
          if (animation.container) {
            animation.container.innerHTML = '';
          }
          workerInstance.postMessage({
            type: 'destroy',
            payload: {
              id: animationId,
            },
          });
        }
      },
      resize: function (width, height) {
        var devicePixelRatio = window.devicePixelRatio || 1;
        workerInstance.postMessage({
          type: 'resize',
          payload: {
            id: animationId,
            // Till Worker thread knows nothing about container, we've to pass it here
            width: width || (animation.container ? animation.container.offsetWidth * devicePixelRatio : 0),
            height: height || (animation.container ? animation.container.offsetHeight * devicePixelRatio : 0),
          },
        });
      },
      updateDocumentData: function (path, documentData, index) {
        workerInstance.postMessage({
          type: 'updateDocumentData',
          payload: {
            id: animationId,
            path: path,
            documentData: documentData,
            index: index,
          },
        });
      },
    };
    animation.animInstance = animInstance;
    resolveAnimationData(params)
      .then(function (animationParams) {
        if (animation.status === 'destroyable') {
          animation.animInstance.destroy();
          return;
        }
        animation.status = 'loaded';
        var transferedObjects = [];
        if (animationParams.container) {
          animation.container = animationParams.container;
          delete animationParams.container;
        }
        if (animationParams.renderer === 'canvas') {
          var canvas = animationParams.rendererSettings.canvas;

          // If no custom canvas was passed
          if (!canvas) {
            var devicePixelRatio = window.devicePixelRatio || 1;
            canvas = document.createElement('canvas');
            animation.container.appendChild(canvas);
            canvas.width = (animation.container ? animation.container.offsetWidth : animationParams.animationData.w) * devicePixelRatio;
            canvas.height = (animation.container ? animation.container.offsetHeight : animationParams.animationData.h) * devicePixelRatio;
            canvas.style.width = '100%';
            canvas.style.height = '100%';
          }

          // Transfer control to offscreen if it's not already
          var transferCanvas = canvas;
          if (typeof OffscreenCanvas === 'undefined') {
            animation.canvas = canvas;
            animation.instructionsHandler = createInstructionsHandler(canvas);
          } else {
            if (!(canvas instanceof OffscreenCanvas)) {
              transferCanvas = canvas.transferControlToOffscreen();
              animationParams.rendererSettings.canvas = transferCanvas;
            }
            transferedObjects.push(transferCanvas);
          }
        }
        animations[animationId] = animation;
        workerInstance.postMessage({
          type: 'load',
          payload: {
            params: animationParams,
            id: animationId,
          },
        }, transferedObjects);
      });
    return animInstance;
  }

  var lottiejs = {
    loadAnimation: loadAnimation,
  };
  return lottiejs;
}());