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babel-preset-h5

v0.2.1

Published

common h5 app babel preset, support latest ES2021

Downloads

9

Readme

babel-preset-h5

npm package GitHub stars GitHub forks NPM downloads GitHub issues

h5 应用的通用 babel 预设

相关依赖:

  • @babel/core
  • @babel/plugin-proposal-class-properties
  • @babel/plugin-transform-runtime
  • @babel/preset-env
  • @babel/preset-react
  • @babel/preset-typescript
  • @babel/runtime
  • @babel/runtime-corejs3
  • core-js

如果你应用中 package.json 已经包含上述某几个依赖,请从 package.json 中移除这些依赖。 安装 babel-preset-h5 时会自动安装上述所有依赖。

使用

  • 第一步:安装 babel-preset-h5

要求 npm 版本 5.0+

npx install-peerdeps --dev babel-preset-h5
  • 第二步:配置 babel 配置文件
// .babelrc
{
  "presets": [
    "babel-preset-h5"
  ]
}

搞定!

配置选项

| 选项 | 含义 | 默认值 | | ------------- | ---------------------- | --------------------------------------- | | targets | 代码运行需要支持的环境 | ['last 2 versions', '> 1%', 'ie >= 11'] | | useTypeScript | 是否使用 TypeScript | true | | useReact | 是否使用 React | true |

特点

  • 支持按需引入 polyfill
  • 不污染全局环境
  • 默认支持 React, 同时支持 react17
  • 默认支持 TypeScript4.1
  • 支持动态导入

最佳实践

指定环境变量,有助于减少线上包的大小。

比如你可以在 webpack.config.js 中,显示指定环境变量

process.env.BABEL_ENV = "production";
process.env.NODE_ENV = "production";

支持的浏览器

  • 默认支持 IE11 及以上的浏览器

支持的语言特性

支持最新的 JavaScript 标准。除了 ES6 语法功能外,它还支持:

  • ES2021(例如:Promise.any)
  • ES2020(例如:Promise.allSettled、可选链操作符)
  • ES2019(例如:Array.prototype.flat)
  • ES2018(例如:Rest 参数和扩展运算符)
  • ES2017(例如:Object.entries)
  • ES2016(例如:Array.prototype.includes)
  • ES2015

注意

不支持 Proxy, 不支持 BigInt, 不支持装饰器