mirror of
https://github.com/zhigang1992/react-native.git
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1eedf05651
Summary: Makes the delta bundle data structures more consistent. The changes are as follows: * There are now two types of JSON bundles that can be downloaded from the delta endpoint. Base bundles (`Bundle` type), and Delta bundles (`DeltaBundle` type). * The `reset` boolean is renamed to `base`. * `pre` and `post` properties are now strings. * Only `Bundle` can define `pre` and `post` properties. * The `delta` property is renamed to `modules`. * Deleted modules are now listed inside of the `deleted` property, which is only defined by `DeltaBundle`. Reviewed By: mjesun Differential Revision: D10446831 fbshipit-source-id: 40e229a2811d48950f0bad8dd341ece189089e9b
76 lines
1.9 KiB
JavaScript
76 lines
1.9 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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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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const client = global.DeltaPatcher.get(deltaUrl);
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const revisionId = client.getLastRevisionId()
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? `&revisionId=${client.getLastRevisionId()}`
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: '';
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const data = await fetch(deltaUrl + revisionId);
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const bundle = await data.json();
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const deltaPatcher = client.applyDelta({
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base: bundle.base,
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revisionId: bundle.revisionId,
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pre: bundle.pre,
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post: bundle.post,
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modules: new Map(bundle.modules),
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});
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let cachedBundle = cachedBundleUrls.get(deltaUrl);
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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 (
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deltaPatcher.getLastNumModifiedFiles() === 0 &&
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cachedBundle != null &&
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cachedBundle !== ''
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) {
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return cachedBundle;
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}
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// Clean up the previous bundle URL to not leak memory.
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if (cachedBundle != null && cachedBundle !== '') {
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URL.revokeObjectURL(cachedBundle);
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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 bundleContents = URL.createObjectURL(blob);
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cachedBundleUrls.set(deltaUrl, bundleContents);
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return bundleContents;
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}
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global.deltaUrlToBlobUrl = deltaUrlToBlobUrl;
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})(window || {});
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