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111 lines
2.7 KiB
111 lines
2.7 KiB
3 years ago
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// @ts-check
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const TerserPlugin = require('terser-webpack-plugin')
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const genTerserOptions = (defaultOptions, options) => {
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const userOptions = options.terser && options.terser.terserOptions
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// user's config is first
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return {
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...defaultOptions,
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...userOptions
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}
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}
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const terserMinify = (options) => ({
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terserOptions: genTerserOptions(
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{
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compress: {
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// turn off flags with small gains to speed up minification
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arrows: false,
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collapse_vars: false, // 0.3kb
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comparisons: false,
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computed_props: false,
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hoist_funs: false,
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hoist_props: false,
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hoist_vars: false,
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inline: false,
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loops: false,
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negate_iife: false,
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properties: false,
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reduce_funcs: false,
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reduce_vars: false,
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switches: false,
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toplevel: false,
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typeofs: false,
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// a few flags with noticeable gains/speed ratio
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// numbers based on out of the box vendor bundle
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booleans: true, // 0.7kb
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if_return: true, // 0.4kb
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sequences: true, // 0.7kb
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unused: true, // 2.3kb
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// required features to drop conditional branches
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conditionals: true,
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dead_code: true,
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evaluate: true
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},
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mangle: {
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safari10: true
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}
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},
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options
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),
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parallel: options.parallel,
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extractComments: false
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})
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// `terserOptions` options will be passed to `esbuild`
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// Link to options - https://esbuild.github.io/api/#minify
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const esbuildMinify = (options) => ({
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minify: TerserPlugin.esbuildMinify,
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terserOptions: genTerserOptions(
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{
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minify: false,
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minifyWhitespace: true,
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minifyIdentifiers: false,
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minifySyntax: true
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},
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options
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),
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parallel: options.parallel
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})
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// `terserOptions` options will be passed to `swc` (`@swc/core`)
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// Link to options - https://swc.rs/docs/config-js-minify
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const swcMinify = (options) => ({
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minify: TerserPlugin.swcMinify,
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terserOptions: genTerserOptions(
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{
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compress: {
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unused: true
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},
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mangle: true
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},
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options
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),
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parallel: options.parallel
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})
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// `terserOptions` options will be passed to `uglify-js`
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// Link to options - https://github.com/mishoo/UglifyJS#minify-options
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const uglifyJsMinify = (options) => ({
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minify: TerserPlugin.uglifyJsMinify,
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terserOptions: genTerserOptions({}, options),
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parallel: options.parallel
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})
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// Currently we do not allow custom minify function
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const getMinify = (options) => {
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const { minify = 'terser' } = options.terser || {}
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const minifyMap = {
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terser: terserMinify,
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esbuild: esbuildMinify,
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swc: swcMinify,
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uglifyJs: uglifyJsMinify
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}
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return minifyMap[minify](options)
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}
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module.exports = getMinify
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