webpack采用esm打包，打包后tree shaking失效，请问如何解决？-灵析社区

webpack采用esm打包，打包后tree shaking失效，请问如何解决？ 我尝试调整webpack配置，如下： const HtmlWebpackPlugin = require('html-webpack-plugin'); const path = require('path'); const isProduction = process.env.NODE_ENV === 'production'; const outputType = process.env.OUTPUT_TYPE; /** @type {import('webpack').Configuration} */ const config = { entry: isProduction ? './components/index.ts' : './demo/index.tsx', externals: !isProduction ? {} : { react: { root: 'React', commonjs2: 'react', commonjs: 'react', amd: 'react', module: 'react' }, "react-dom": { root: 'ReactDOM', commonjs2: 'react-dom', commonjs: 'react-dom', amd: 'react-dom', module: 'react-dom' } }, experiments: { outputModule: outputType === 'esm' }, mode: isProduction ? 'production' : 'development', module: { rules: [ { exclude: /node_modules/, test: /\.js(x?)$/, use: [ { loader: 'babel-loader' } ] }, { exclude: /node_modules/, test: /\.ts(x?)$/, use: [ { loader: 'babel-loader' }, { loader: 'ts-loader' } ] }, { exclude: /.min.css$/, test: /\.(sa|sc|c)ss$/, use: [ { loader: 'style-loader' }, { loader: 'css-loader', options: { modules: { mode: 'global' } } }, { loader: 'postcss-loader', options: { postcssOptions: { plugins: [ 'postcss-preset-env' ] } } }, { loader: 'sass-loader' } ], } ] }, output: outputType === 'esm' ? { chunkFormat: 'module', clean: true, filename: '[name].esm.js', library: { type: 'module' }, path: path.resolve(__dirname, '../es') } : { clean: true, filename: '[name].js', library: { export: 'default', name: 'rollup-test', type: 'umd' }, path: path.resolve(__dirname, '../lib') }, plugins: [ ...(!isProduction ? [new HtmlWebpackPlugin({ filename: 'index.html', template: path.resolve(__dirname, '../demo/index.html'), title: 'rollup-test' })] : []) ], resolve: { extensions: ['.ts', '.tsx', '.js', 'jsx', '.json'] }, }; module.exports = config; 然后package.json如下： ... "main": "lib/main.js", "module": "es/main.esm.js", "types": "types/index.d.ts", "sideEffects": false, "scripts": { "build": "npm run generate:esm & npm run generate:umd", "generate:esm": "cross-env BABEL_ENV=esm NODE_ENV=production OUTPUT_TYPE=esm webpack --config ./config/webpack.config.js", "generate:umd": "cross-env BABEL_ENV=build NODE_ENV=production OUTPUT_TYPE=umd webpack --config ./config/webpack.config.js", } ... 导出的esm文件也正常，如下 /*! For license information please see main.esm.js.LICENSE.txt */ import*as r from"react";export const id=179;export const ids=[179];export const modules={564:(r,e,t)=>{t.d(e,{bZ:()=>n,zx:()=>s,ZP:()=>a});var o=t(893);const n=function(r){var e=r.children;return(0,o.jsx)("div",{className:"alert-component",children:e})};t(846);const s=function(r){var e=r.children;return(0,o.jsx)("div",{className:"button-component",children:e})},a={Alert:n,Button:s}},251:(r,e,t)=>{var o=t(846),n=Symbol.for("react.element"),s=(Symbol.for("react.fragment"),Object.prototype.hasOwnProperty),a=o.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentOwner,c={key:!0,ref:!0,__self:!0,__source:!0};e.jsx=function(r,e,t){var o,i={},l=null,f=null;for(o in void 0!==t&&(l=""+t),void 0!==e.key&&(l=""+e.key),void 0!==e.ref&&(f=e.ref),e)s.call(e,o)&&!c.hasOwnProperty(o)&&(i[o]=e[o]);if(r&&r.defaultProps)for(o in e=r.defaultProps)void 0===i[o]&&(i[o]=e[o]);return{$$typeof:n,type:r,key:l,ref:f,props:i,_owner:a.current}}},893:(r,e,t)=>{r.exports=t(251)},846:e=>{e.exports=r}};import e from"./manifest.esm.js";import*as t from"./main.esm.js";e.C(t);var o=(564,e(e.s=564)),n=o.bZ,s=o.zx,a=o.ZP;export{n as Alert,s as Button,a as default}; 但是通过`npm link`后`npm run build`发现`tree shaking`失效，无论是否使用，所有文件都构建了