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minifier.js
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minifier.js
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/**
* Copyright (c) Facebook, Inc. and its 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
*/
'use strict';
const uglify = require('uglify-es');
import type {
MetroMinifier,
MetroMinifierResult,
MinifyOptions,
} from 'metro/src/shared/types.flow.js';
import type {BabelSourceMap} from '@babel/core';
function minifier(
code: string,
sourceMap: ?BabelSourceMap,
filename: string,
options?: MinifyOptions = {},
): MetroMinifierResult {
const result = minify(code, sourceMap, options);
const map: BabelSourceMap = JSON.parse(result.map);
map.sources = [filename];
return {code: result.code, map};
}
function minify(
inputCode: string,
inputMap: ?BabelSourceMap,
options: MinifyOptions,
) {
const result = uglify.minify(inputCode, {
mangle: {
toplevel: false,
reserved: options.reserved,
},
output: {
ascii_only: true,
quote_style: 3,
wrap_iife: true,
},
sourceMap: {
content: inputMap,
includeSources: false,
},
toplevel: false,
compress: {
// reduce_funcs inlines single-use function, which cause perf regressions.
reduce_funcs: false,
},
});
if (result.error) {
throw result.error;
}
return {
code: result.code,
map: result.map,
};
}
const metroMinifier: MetroMinifier = minifier;
module.exports = metroMinifier;