74 lines
1.9 KiB
JavaScript
74 lines
1.9 KiB
JavaScript
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @flow
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* @format
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*/
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/* global Blob, URL: true */
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(function(global) {
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'use strict';
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let cachedBundleUrls = new Map();
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/**
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* Converts the passed delta URL into an URL object containing already the
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* whole JS bundle Blob.
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*/
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async function deltaUrlToBlobUrl(deltaUrl) {
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let cachedBundle = cachedBundleUrls.get(deltaUrl);
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const deltaBundleId = cachedBundle
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? `&deltaBundleId=${cachedBundle.id}`
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: '';
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const data = await fetch(deltaUrl + deltaBundleId);
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const bundle = await data.json();
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const deltaPatcher = global.DeltaPatcher.get(bundle.id).applyDelta({
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pre: new Map(bundle.pre),
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post: new Map(bundle.post),
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delta: new Map(bundle.delta),
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reset: bundle.reset,
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});
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// If nothing changed, avoid recreating a bundle blob by reusing the
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// previous one.
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if (deltaPatcher.getLastNumModifiedFiles() === 0 && cachedBundle) {
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return cachedBundle.url;
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}
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// Clean up the previous bundle URL to not leak memory.
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if (cachedBundle) {
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URL.revokeObjectURL(cachedBundle.url);
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}
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// To make Source Maps work correctly, we need to add a newline between
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// modules.
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const blobContent = deltaPatcher
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.getAllModules()
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.map(module => module + '\n');
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// Build the blob with the whole JS bundle.
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const blob = new Blob(blobContent, {
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type: 'application/javascript',
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});
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const bundleUrl = URL.createObjectURL(blob);
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cachedBundleUrls.set(deltaUrl, {
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id: bundle.id,
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url: bundleUrl,
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});
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return bundleUrl;
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}
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global.deltaUrlToBlobUrl = deltaUrlToBlobUrl;
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})(window || {});
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