40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
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"use strict";
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/*
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Copyright 2018 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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const stringify = require('json-stable-stringify');
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/**
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* The variable name that workbox-sw expects manifest entries to be assigned.
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* @type {String}
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* @private
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*/
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const PRECACHE_MANIFEST_VAR = '__precacheManifest';
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/**
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* Generates a template string from an array of manifest entries that can be
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* written to a manifest file.
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*
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* @function generateManifestWithWebpack
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* @param {Array<module:workbox-build.ManifestEntry>} manifestEntries
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* @return {string} service worker manifest file string
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*
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* @private
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*/
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module.exports = manifestEntries => {
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const sortedEntries = manifestEntries.sort((a, b) => a.url === b.url ? 0 : a.url > b.url ? 1 : -1); // json-stable-stringify ensures that we get a consistent output, with all
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// the properties of each object sorted.
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// There's a hash created of the serialized JSON data, and we want the hash to
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// be the same if the data is the same, without any sort-order variation.
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const entriesJson = stringify(sortedEntries, {
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space: 2
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});
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return `self.${PRECACHE_MANIFEST_VAR} = (self.${PRECACHE_MANIFEST_VAR} || ` + `[]).concat(${entriesJson});`;
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};
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