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-overrides const { 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" } }