mirror of
https://github.com/zhigang1992/react-native.git
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bea57d871f
Summary: Adds support for the `deleted` key to remove modules from the bundle. Without this, source maps would break after removing a module, since it would still end up in the patched bundle but not in the source map. Reviewed By: mjesun Differential Revision: D12874011 fbshipit-source-id: 79239756854cb2c02f14ec8b0bb2b649766393fe
70 lines
1.8 KiB
JavaScript
70 lines
1.8 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(bundle);
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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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