core-js 包很大使用 62kB

问题描述

我正在减少我的 js 包大小并偶然发现了 core-js。它大约需要 62kB，占整个包的 24%。

我尝试使用 @babel/preset-env，但无法进一步缩小尺寸。不确定我是否使用了“正确”的设置：

'@babel/preset-env',{
    targets: {
      browsers: ['>1%'],},useBuiltIns: 'usage',corejs: { version: 3,proposals: true },

完整的webpack.config.js

const path = require('path');
const webpack = require('webpack');
const dotenv = require('dotenv');
const copyWebpackPlugin = require('copy-webpack-plugin');
const bundleOutputDir = './dist';

/* eslint-disable import/no-extraneous-dependencies */
const TsconfigPathsPlugin = require('tsconfig-paths-webpack-plugin');
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');

// const CompressionPlugin = require('compression-webpack-plugin');

module.exports = (env) => {
  // get project ID (environment)
  const projectID = process.env.PROJECT_ID;
  if (!projectID || projectID === undefined) {
    throw new Error('Need env variable PROJECT_ID');
  }

  const isDevEnvironment = !(projectID === 'production-project');
  const isDevBuild = !(env && env.prod);
  const analyzeBundle = env && env.analyze;

  // call dotenv and it will return an Object with a parsed key
  const dotEnv = isDevEnvironment ? dotenv.config({ path: './.env.development' }).parsed : dotenv.config().parsed;

  // reduce it to a nice object,the same as before
  const envKeys = Object.keys(dotEnv).reduce((prev,next) => {
    const updatedPrev = prev;
    updatedPrev[`process.env.${next}`] = JSON.stringify(dotEnv[next]);
    return updatedPrev;
  },{});

  envKeys['process.env.PROJECT_ID'] = JSON.stringify(projectID);

  // need to remove quotes from env
  const publicURL = 'https:/mysite.com'

  const plugins = [new webpack.DefinePlugin(envKeys),new ForkTsCheckerWebpackPlugin()];
  if (isDevBuild) {
    // eslint-disable-next-line new-cap
    plugins.push(new webpack.sourceMapDevToolPlugin(),new copyWebpackPlugin([{ from: 'dev/' }]));
  } else {
    // Don't need to enable compressinon plugin as Firebase Hosting automatically zips the files for us
    // plugins.push(new CompressionPlugin());
  }

  if (analyzeBundle) {
    // eslint-disable-next-line global-require
    const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
    plugins.push(new BundleAnalyzerPlugin());
  }

  const babelPlugins = [
    // Syntax sugar found in React components
    '@babel/proposal-class-properties','@babel/proposal-object-rest-spread',// transpile JSX/TSX to JS
    [
      '@babel/plugin-transform-react-jsx',{
        // we use Preact,which has `Preact.h` instead of `React.createElement`
        pragma: 'h',pragmaFrag: 'Fragment',],[
      'transform-react-remove-prop-types',{
        removeImport: !isDevBuild,];

  if (!isDevBuild) {
    babelPlugins.push(['transform-remove-console',{ exclude: ['error','warn'] }]);
  }

  return [
    {
      entry: './src/index.ts',output: {
        filename: 'widget.js',path: path.resolve(bundleOutputDir),publicPath: isDevBuild ? '' : publicURL,devServer: {
        host: '0.0.0.0',// your ip address
        port: 8080,disableHostCheck: true,contentBase: bundleOutputDir,open: 'google chrome',plugins,optimization: {
        minimize: !isDevBuild,nodeenv: 'production',mangleWasmImports: true,removeAvailableModules: true,usedExports: true,sideEffects: true,providedExports: true,concatenateModules: true,mode: isDevBuild ? 'development' : 'production',module: {
        rules: [
          // packs PNG's discovered in url() into bundle
          {
            test: /\.(jpe?g|png|webp)$/i,use: [
              {
                loader: 'responsive-loader',options: {
                  // eslint-disable-next-line global-require
                  adapter: require('responsive-loader/sharp'),// sizes: [160,320,640,960,1280],name: '[path][name]-[width].[ext]',sourceMap: isDevBuild,{ test: /\.svg/,use: ['@svgr/webpack'] },{
            test: /\.(css)$/i,use: [
              {
                loader: 'style-loader',options: {
                  injectType: 'singletonStyleTag',{
                // allows import CSS as modules
                loader: 'css-loader',options: {
                  modules: {
                    // css class names format
                    localIdentName: '[name]-[local]-[hash:base64:5]',{
            test: /\.(scss)$/i,options: { injectType: 'singletonStyleTag' },{
                loader: 'sass-loader',options: {
                  sourceMap: isDevBuild,// use babel-loader for TS and JS modeles,// starting v7 Babel babel-loader can transpile TS into JS,// so no need for ts-loader
          // note,that in dev we still use tsc for type checking
          {
            test: /\.(js|ts|tsx|jsx)$/,exclude: /node_modules/,use: [
              {
                loader: 'babel-loader',options: {
                  presets: [
                    [
                      '@babel/preset-env',{
                        targets: {
                          browsers: ['>1%'],[
                      // enable transpiling ts => js
                      '@babel/typescript',// tell babel to compile JSX using into Preact
                      { jsxPragma: 'h' },plugins: babelPlugins,resolve: {
        extensions: ['*','.js','.ts','.tsx'],plugins: [new TsconfigPathsPlugin()],alias: {
          react: 'preact/compat','react-dom': 'preact/compat',images: path.join(__dirname,'images'),sharedimages: path.resolve(__dirname,'../../packages/shared/src/resources'),];
};

解决方法

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