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babel-preset-axum

v1.0.3

Published

[https://juejin.cn/column/7031914136783028237](https://juejin.cn/column/7031914136783028237)

Downloads

17

Readme

参考

https://juejin.cn/column/7031914136783028237

Babel配置不要再“复制粘贴”了,带你自己配一个Babel

近万字长文带你理解并掌握 Babel7 如何配置

最佳实践

项目开发

plugin-transform-runtime只使用其移除内联复用的辅助函数的特性,减小打包体积

{
  test: /\.js?$/,
  exclude: /node_modules/,
  use: {
    loader: 'babel-loader',
    options: {
      presets: [["@babel/preset-env", { useBuiltIns: 'usage', corejs: { version: 3 } }]]
      plugins: [["@babel/plugin-transform-runtime", { "corejs": false }]]
    }
  }
}

类库开发

类库开发尽量不使用污染全局环境的polyfill,因此@babel/preset-env只发挥语法转换的功能 polyfill由@babel/plugin-transform-runtime来处理,推荐使用core-js@3

{
  presets: [["@babel/preset-env"]],
  plugins: [["@babel/plugin-transform-runtime", corejs: { version: 3 } }]]
}

值得关注的信息

如果你正在编译 generator 函数或 async 函数为 ES5,并且你正在使用版本低于 7.18.0 的 @babel/helpers(@babel/core 下的子依赖) 或 @babel/plugin-transform-regenerator,那么你必须在入口文件引入 regenerator runtime。