text: "use strict";
  
  const conversions = require("webidl-conversions");
  const utils = require("./utils.js");
  const Event = require("./Event.js");
  const impl = utils.implSymbol;
  const convertMessageEventInit = require("./MessageEventInit").convert;
  
  function MessageEvent(type) {
    if (!this || this[impl] || !(this instanceof MessageEvent)) {
      throw new TypeError("Failed to construct 'MessageEvent': Please use the 'new' operator, this DOM object constructor cannot be called as a function.");
    }
    if (arguments.length < 1) {
      throw new TypeError("Failed to construct 'MessageEvent': 1 argument required, but only " + arguments.length + " present.");
    }
    const args = [];
    for (let i = 0; i < arguments.length && i < 2; ++i) {
      args[i] = utils.tryImplForWrapper(arguments[i]);
    }
    args[0] = conversions["DOMString"](args[0]);
    args[1] = convertMessageEventInit(args[1]);
  
    module.exports.setup(this, args);
  }
  MessageEvent.prototype = Object.create(Event.interface.prototype);
  MessageEvent.prototype.constructor = MessageEvent;
  
  
  MessageEvent.prototype.initMessageEvent = function initMessageEvent(type, bubbles, cancelable, data, origin, lastEventId, source, ports) {
    if (!this || !module.exports.is(this)) {
      throw new TypeError("Illegal invocation");
    }
    if (arguments.length < 8) {
      throw new TypeError("Failed to execute 'initMessageEvent' on 'MessageEvent': 8 arguments required, but only " + arguments.length + " present.");
    }
    const args = [];
    for (let i = 0; i < arguments.length && i < 8; ++i) {
      args[i] = utils.tryImplForWrapper(arguments[i]);
    }
    args[0] = conversions["DOMString"](args[0]);
    args[1] = conversions["boolean"](args[1]);
    args[2] = conversions["boolean"](args[2]);
    args[4] = conversions["DOMString"](args[4]);
    args[5] = conversions["DOMString"](args[5]);
    if (args[6] === null || args[6] === undefined) {
      args[6] = null;
    } else {
    }
    if (args[7] === null || args[7] === undefined) {
      args[7] = null;
    } else {
    }
    return utils.tryWrapperForImpl(this[impl].initMessageEvent.apply(this[impl], args));
  };
  
  MessageEvent.prototype.toString = function () {
    if (this === MessageEvent.prototype) {
      return "[object MessageEventPrototype]";
    }
    return Event.interface.prototype.toString.call(this);
  };
  Object.defineProperty(MessageEvent.prototype, "data", {
    get() {
      return utils.tryWrapperForImpl(this[impl].data);
    },
    enumerable: true,
    configurable: true
  });
  
  Object.defineProperty(MessageEvent.prototype, "origin", {
    get() {
      return utils.tryWrapperForImpl(this[impl].origin);
    },
    enumerable: true,
    configurable: true
  });
  
  Object.defineProperty(MessageEvent.prototype, "lastEventId", {
    get() {
      return utils.tryWrapperForImpl(this[impl].lastEventId);
    },
    enumerable: true,
    configurable: true
  });
  
  Object.defineProperty(MessageEvent.prototype, "source", {
    get() {
      return utils.tryWrapperForImpl(this[impl].source);
    },
    enumerable: true,
    configurable: true
  });
  
  Object.defineProperty(MessageEvent.prototype, "ports", {
    get() {
      return utils.tryWrapperForImpl(this[impl].ports);
    },
    enumerable: true,
    configurable: true
  });
  
  
  module.exports = {
    mixedInto: [],
    is(obj) {
      if (obj) {
        if (obj[impl] instanceof Impl.implementation) {
          return true;
        }
        for (let i = 0; i < module.exports.mixedInto.length; ++i) {
          if (obj instanceof module.exports.mixedInto[i]) {
            return true;
          }
        }
      }
      return false;
    },
    isImpl(obj) {
      if (obj) {
        if (obj instanceof Impl.implementation) {
          return true;
        }
  
        const wrapper = utils.wrapperForImpl(obj);
        for (let i = 0; i < module.exports.mixedInto.length; ++i) {
          if (wrapper instanceof module.exports.mixedInto[i]) {
            return true;
          }
        }
      }
      return false;
    },
    create(constructorArgs, privateData) {
      let obj = Object.create(MessageEvent.prototype);
      this.setup(obj, constructorArgs, privateData);
      return obj;
    },
    createImpl(constructorArgs, privateData) {
      let obj = Object.create(MessageEvent.prototype);
      this.setup(obj, constructorArgs, privateData);
      return utils.implForWrapper(obj);
    },
    _internalSetup(obj) {
      Event._internalSetup(obj);
  
    },
    setup(obj, constructorArgs, privateData) {
      if (!privateData) privateData = {};
      privateData.wrapper = obj;
  
      this._internalSetup(obj);
  
      obj[impl] = new Impl.implementation(constructorArgs, privateData);
      obj[impl][utils.wrapperSymbol] = obj;
    },
    interface: MessageEvent,
    expose: {
      Window: { MessageEvent: MessageEvent },
      Worker: { MessageEvent: MessageEvent }
    }
  };
  
  
  const Impl = require("../events/MessageEvent-impl.js");
  