70 lines
1.4 KiB
JavaScript
70 lines
1.4 KiB
JavaScript
/**
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* Copyright (c) 2016-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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* @format
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*/
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'use strict';
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const uglify = require('uglify-es');
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import type {MetroMinifier} from './types.js.flow';
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import type {ResultWithMap} from './types.js.flow';
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import type {BabelSourceMap} from '@babel/core';
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function noSourceMap(code: string): string {
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return minify(code).code;
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}
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function withSourceMap(
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code: string,
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sourceMap: ?BabelSourceMap,
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filename: string,
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): ResultWithMap {
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const result = minify(code, sourceMap);
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const map: BabelSourceMap = JSON.parse(result.map);
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map.sources = [filename];
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return {code: result.code, map};
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}
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function minify(inputCode: string, inputMap: ?BabelSourceMap) {
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const result = uglify.minify(inputCode, {
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mangle: {toplevel: true},
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output: {
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ascii_only: true,
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quote_style: 3,
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wrap_iife: true,
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},
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sourceMap: {
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content: inputMap,
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includeSources: false,
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},
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toplevel: true,
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compress: {
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// reduce_funcs inlines single-use function, which cause perf regressions.
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reduce_funcs: false,
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},
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});
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if (result.error) {
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throw result.error;
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}
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return {
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code: result.code,
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map: result.map,
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};
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}
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const metroMinifier: MetroMinifier = {
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noSourceMap,
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withSourceMap,
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};
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module.exports = metroMinifier;
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