text: /* Copyright 2017 Mozilla Foundation
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  let isReadableStreamSupported = false;
  if (typeof ReadableStream !== 'undefined') {
    // MS Edge may say it has ReadableStream but they are not up to spec yet.
    try {
      // eslint-disable-next-line no-new
      new ReadableStream({
        start(controller) {
          controller.close();
        },
      });
      isReadableStreamSupported = true;
    } catch (e) {
      // The ReadableStream constructor cannot be used.
    }
  }
  if (isReadableStreamSupported) {
    exports.ReadableStream = ReadableStream;
  } else {
    if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME')) {
      throw new Error('ReadableStream polyfill is not found for Chrome bundle');
    }
    exports.ReadableStream =
      require('../../external/streams/streams-lib').ReadableStream;
  }
  