forked from external-repos/squoosh
68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
/**
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* Copyright 2020 Google Inc. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { createHash } from 'crypto';
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import { posix } from 'path';
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const importPrefix = 'service-worker:';
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export default function serviceWorkerPlugin({
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output = 'sw.js',
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filterAssets = () => true,
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} = {}) {
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return {
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name: 'service-worker',
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async resolveId(id, importer) {
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if (!id.startsWith(importPrefix)) return;
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const plainId = id.slice(importPrefix.length);
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const result = await this.resolve(plainId, importer);
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if (!result) return;
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return importPrefix + result.id;
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},
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load(id) {
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if (!id.startsWith(importPrefix)) return;
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const fileId = this.emitFile({
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type: 'chunk',
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id: id.slice(importPrefix.length),
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fileName: output,
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});
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return `export default import.meta.ROLLUP_FILE_URL_${fileId};`;
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},
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generateBundle(options, bundle) {
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const swChunk = bundle[output];
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const toCacheInSW = Object.values(bundle).filter(
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(item) => item !== swChunk && filterAssets(item),
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);
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const urls = toCacheInSW.map(
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(item) =>
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posix
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.relative(posix.dirname(output), item.fileName)
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.replace(/((?<=^|\/)index)?\.html?$/, '') || '.',
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);
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const versionHash = createHash('sha1');
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for (const item of toCacheInSW) {
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versionHash.update(item.code || item.source);
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}
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const version = versionHash.digest('hex');
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swChunk.code =
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`const ASSETS = ${JSON.stringify(urls, null, ' ')};\n` +
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`const VERSION = ${JSON.stringify(version)};\n` +
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swChunk.code;
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},
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};
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}
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