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minifier.js
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minifier.js
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow strict-local
* @format
* @oncall react_native
*/
'use strict';
import type {BasicSourceMap} from 'metro-source-map';
import type {MinifierOptions, MinifierResult} from 'metro-transform-worker';
const terser = require('terser');
async function minifier(options: MinifierOptions): Promise<MinifierResult> {
const result = await minify(options);
if (!options.map || result.map == null) {
return {code: result.code};
}
const map: BasicSourceMap = JSON.parse(result.map);
return {code: result.code, map: {...map, sources: [options.filename]}};
}
async function minify({
code,
map,
reserved,
config,
}: MinifierOptions): Promise<{code: string, map: ?string}> {
const options = {
...config,
output: {
// Mitigate https://github.com/terser/terser/issues/1341 - Terser may
// set its internal data on this object, so give it a shallow copy.
...(config.output ?? {}),
},
mangle:
config.mangle === false
? false
: {
...config.mangle,
reserved,
},
sourceMap: map
? config.sourceMap === false
? false
: {
...config.sourceMap,
content: map,
}
: false,
};
/* $FlowFixMe(>=0.111.0 site=react_native_fb) This comment suppresses an
* error found when Flow v0.111 was deployed. To see the error, delete this
* comment and run Flow. */
const result = await terser.minify(code, options);
return {
code: result.code,
map: result.map,
};
}
module.exports = minifier;