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