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"
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持Devmax。