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