关于前端:如何打一个既支持cjs又支持esm的npm包

模块化是一个陈词滥调的问题了，打包工具层出不穷。

那么，如何利用这些打包工具去打出既反对 cjs，又反对 esm 的 npm 包呢。

这篇文章不波及概念，是一些打包实测。

demo repo: https://github.com/FrankKai/n…

能够 clone 下来，本地构建测试。

• tsc
• rollup
• webpack
• esbuild

tsc

• tsconfig.json
• tsconfig-esm.json
• package.json

cjs

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2015",
    "module": "commonjs",
    "outDir": "./dist/cjs",
    "esModuleInterop": true,
    "moduleResolution": "node"
  }
}

esm

tsconfig-esm.json

{
  "extends": "./tsconfig.json",

  "compilerOptions": {
    "target": "es2015",
    "module": "es2015",
    "outDir": "./dist/esm",
    "moduleResolution": "node"
  }
}

package.json

{
  "main": "./dist/cjs/index.js",
  "module": "./dist/esm/index.js",
  "scripts": {"build": "rm -rf dist && tsc -p tsconfig.json && tsc -p tsconfig-esm.json"},
}

rollup

• rollup.config.js
• package.json

rollup.config.js

export default [
  {
    input: "src/index.js",
    output: [{ file: "dist/index.cjs.js", format: "cjs"},
      {file: "dist/index.esm.js", format: "es"},
    ],
  },
];

package.json

{
  "main": "dist/index.cjs.js",
  "module": "dist/index.esm.js",
  "scripts": {"build": "rollup -c",},
}

webpack

• webpack.config.js
• package.json

webpack.config.js

const path = require("path");

module.exports = {
  mode: 'none',
  entry: {
    "index.cjs": {
      import: './src/index.js',
      library: {type: 'commonjs2',},

    },
    "index.esm": {
      import: './src/index.js',
      library: {type: 'module',},
    },
  },
  output: {path: path.resolve(__dirname, 'dist'),
    filename: "[name].js",
    clean: true,
  },
  experiments: {outputModule: true}
};

package.json

{
  "main": "dist/index.cjs.js",
  "module": "dist/index.esm.js",
  "scripts": {"build": "webpack",},
  "devDependencies": {
    "webpack": "^5.38.1",
    "webpack-cli": "^4.7.2"
  }
}

esbuild

• package.json

  {
  "main": "dist/index.cjs.js",
  "module": "dist/index.esm.js",
  "scripts": {
    "esbuild:cjs": "esbuild ./src/index.js --bundle --outfile=dist/index.cjs.js --format=cjs",
    "esbuild:esm": "esbuild ./src/index.js --bundle --outfile=dist/index.esm.js --format=esm",
    "build": "npm run esbuild:cjs && npm run esbuild:esm"
  },
  "devDependencies": {"esbuild": "^0.14.49"},
  }