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bundle.js
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bundle.js
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/*
Copyright 2019 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
const {rollup} = require('rollup');
const {terser} = require('rollup-plugin-terser');
const {writeFile} = require('fs-extra');
const babel = require('rollup-plugin-babel');
const omt = require('@surma/rollup-plugin-off-main-thread');
const upath = require('upath');
const presetEnv = require('@babel/preset-env');
const replace = require('rollup-plugin-replace');
const resolve = require('rollup-plugin-node-resolve');
const tempy = require('tempy');
module.exports = async ({
babelPresetEnvTargets,
inlineWorkboxRuntime,
mode,
sourcemap,
swDest,
unbundledCode,
}) => {
// We need to write this to the "real" file system, as Rollup won't read from
// a custom file system.
const {dir, base} = upath.parse(swDest);
const temporaryFile = tempy.file({name: base});
await writeFile(temporaryFile, unbundledCode);
const plugins = [
resolve(),
replace({'process.env.NODE_ENV': JSON.stringify(mode)}),
babel({
// Disable the logic that checks for local Babel config files:
// https://github.com/GoogleChrome/workbox/issues/2111
babelrc: false,
configFile: false,
presets: [[presetEnv, {
targets: {
browsers: babelPresetEnvTargets,
},
loose: true,
}]],
}),
];
if (mode === 'production') {
plugins.push(terser({
mangle: {
toplevel: true,
properties: {
regex: /(^_|_$)/,
},
},
}));
}
const rollupConfig = {
plugins,
input: temporaryFile,
};
// Rollup will inline the runtime by default. If we don't want that, we need
// to add in some additional config.
if (!inlineWorkboxRuntime) {
rollupConfig.plugins.unshift(omt());
rollupConfig.manualChunks = (id) => {
return id.includes('workbox') ? 'workbox' : undefined;
};
}
const bundle = await rollup(rollupConfig);
const {output} = await bundle.generate({
sourcemap,
// Using an external Workbox runtime requires 'amd'.
format: inlineWorkboxRuntime ? 'es' : 'amd',
});
const files = [];
for (const chunkOrAsset of output) {
if (chunkOrAsset.isAsset) {
files.push({
name: chunkOrAsset.fileName,
contents: chunkOrAsset.source,
});
} else {
let code = chunkOrAsset.code;
if (chunkOrAsset.map) {
const sourceMapFile = chunkOrAsset.fileName + '.map';
code += `//# sourceMappingURL=${sourceMapFile}\n`;
files.push({
name: sourceMapFile,
contents: chunkOrAsset.map.toString(),
});
}
files.push({
name: chunkOrAsset.fileName,
contents: code,
});
}
}
// Make sure that if there was a directory portion included in swDest, it's
// preprended to all of the generated files.
return files.map((file) => {
file.name = upath.format({
dir,
base: file.name,
});
return file;
});
};