text: /*
   * Copyright (C) 2014 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /**
   * @unrestricted
   */
  export class WorkerWrapper {
    /**
     * @param {string} appName
     */
    constructor(appName) {
      let url = appName + '.js';
      // @ts-ignore Runtime needs to be properly exported
      url += Root.Runtime.queryParamsString();
  
      /** @type {!Promise<!Worker>} */
      this._workerPromise = new Promise(fulfill => {
        const worker = new Worker(url, {type: 'module'});
        worker.onmessage = event => {
          console.assert(event.data === 'workerReady');
          worker.onmessage = null;
          fulfill(worker);
        };
      });
    }
  
    /**
     * @param {*} message
     */
    postMessage(message) {
      this._workerPromise.then(worker => {
        if (!this._disposed) {
          worker.postMessage(message);
        }
      });
    }
  
    dispose() {
      this._disposed = true;
      this._workerPromise.then(worker => worker.terminate());
    }
  
    terminate() {
      this.dispose();
    }
  
    /**
     * @param {?function(!MessageEvent):void} listener
     */
    set onmessage(listener) {
      this._workerPromise.then(worker => worker.onmessage = listener);
    }
  
    /**
     * @param {?function(!Event):void} listener
     */
    set onerror(listener) {
      this._workerPromise.then(worker => worker.onerror = listener);
    }
  }
  