详解create-react-app 2.0版本如何启用装饰器语法

2019-11-19 12:38:46

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create-react-app(简称cra)已经更新之2.0.3版本, babel也更新至7.x版本, JavaScript装饰器语法虽然还不是标准, 但是借助于babel, 也能在项目里愉快的玩耍.

cra2.0时代如何启用装饰器语法呢? 我们依旧采用的是react-app-rewired, 通过劫持webpack cofig对象, 达到修改的目的.

yarn add react-app-rewired

修改package.json

"scripts": {  "start": "react-app-rewired start",  "build": "react-app-rewired build",  "test": "react-app-rewired test" }

安装装饰器语法所需的babel插件, 也可以顺带升级babel-core

yarn add @babel/plugin-proposal-decorators metro-react-native-babel-preset -D

在项目根目录下创建.babelrc, config-overrides.js文件

// .babelrc{ "presets": ["module:metro-react-native-babel-preset"], "plugins": [  [   "@babel/plugin-proposal-decorators",   {    "legacy": true   }  ] ]}// config-overridesconst { getBabelLoader } = require('react-app-rewired');const path = require('path');module.exports = function override(config, env) { const babelLoader = getBabelLoader(config.module.rules); const pwd = path.resolve(); babelLoader.include = [path.normalize(`${pwd}/src`)]; // use babelrc babelLoader.options.babelrc = true;  return config;};

原理就是劫持了config对象, 对其babel规则进行简单的修改.

附上完整的package.json

{ "name": "my-react-project", "version": "0.1.0", "private": true, "dependencies": {  "react": "^16.5.2",  "react-app-rewired": "^1.6.2",  "react-dom": "^16.5.2",  "react-scripts": "2.0.5" }, "scripts": {  "start": "react-app-rewired start",  "build": "react-app-rewired build",  "test": "react-app-rewired test" }, "eslintConfig": {  "extends": "react-app" }, "browserslist": [  ">0.2%",  "not dead",  "not ie <= 11",  "not op_mini all" ], "devDependencies": {  "@babel/plugin-proposal-decorators": "^7.1.2",  "metro-react-native-babel-preset": "^0.48.1",  "webpack-bundle-analyzer": "^3.0.3" }}

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