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@tongtian/babel-preset

v1.3.1

Published

专为react app 提供的Babel preset

Downloads

14

Readme

@tongtian/babel-preset

简介

这个 package 是专为 react 应用设计的 babel 预设。

依赖

安装

npm 版本 7 及以上

npm install --save-dev @tongtian/babel-preset

npm 版本 6 及以下

npm install --save-dev @tongtian/babel-preset @babel/core  @babel/plugin-proposal-decorators @babel/plugin-transform-runtime @babel/preset-env @babel/preset-react @babel/preset-typescript @babel/runtime @babel/runtime-corejs3 core-js

npm 版本 5.0+也可以按下面的方式安装

npx install-peerdeps --dev @tongtian/babel-preset

用法

配置选项

| 选项 | 含义 | 默认值 | | ------------- | -------------------------------------------------------------------------------------------------- | ------- | | useTypeScript | 是否使用 TypeScript | true | | runtime | 编译 JSX 使用哪个运行时, React17 推荐使用 automatic (babel7.9.0 开始支持), 旧版 react 使用 classic | classic |

直接使用

babel 7.13.0 开始,可以直接在配置顶层设置 targets

// .babelrc
{
  "targets": "> 0.25%, not dead",
  "presets": ["@tongtian/babel-preset"]
}

不使用 Typescript

// .babelrc
{
  "targets": "> 0.25%, not dead",
  "presets": [["@tongtian/babel-preset", { "useTypeScript": false }]]
}

最佳实践

使用.browserslistrc 文件指定目标环境

# Browsers that we support

defaults
not IE 11

为不同运行环境,指定环境变量

开发环境:

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

生产环境:

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

使用 React 时,有助于减少线上包的大小。

为测试设置 targets

const isTestEnv = process.env.NODE_ENV === 'test';
module.exports = {
  targets: isTestEnv
    ? { node: 'current' }
    : {
        browsers: ['last 2 versions', '> 1%', 'ie >= 9'],
      },
  presets: [
    [
      '@tongtian/babel-preset',
      {
        runtime: 'automatic',
      },
    ],
  ]
};

当 node 版本保持较新时,有助于提高测试效率。因为减少了测试过程中,代码的转换。

特点

  • 支持按需引入 polyfill
  • 不污染全局环境
  • 支持 React
  • 默认支持 TypeScript
  • 支持动态导入
  • 支持装饰器
  • 支持大部分 Javascript 标准

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
  • 支持 Class 的私有字段、私有方法、静态字段

注意

不支持 Proxy, 不支持 BigInt