bug solved | This experimental syntax requires enabling xxx

另外，这俩问题是我在mobx中使用ES7装饰器语法用到的，用普通的ES6语法是不会碰到这样的问题，嫌麻烦也可以不用装饰器语法，奈何我对这种看上去像Spring注释的语法垂涎已久。

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bug1

Experimental support for decorators is a feature that is subject to change in a future release. Set the ‘experimentalDecorators’ option in your ‘tsconfig’ or ‘jsconfig’ to remove this warning.ts(1219)

问题出在IDE不认识这个语法 以vscode为例 需要在setting中搜“experimentalDecorators”然后勾选上

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bug2

Parsing error: This experimental syntax requires enabling one of the following parser plugin(s): “decorators”, “decorators-legacy”. (22:4)eslint

问题出在项目本身不认识这个语法（当前这个语法还在试验阶段 babel还没有正式发布），这个解决起来稍微有点麻烦，翻了很久stackoverflow和github issue，回答都是支支吾吾 遮遮掩掩，故作此篇，以飨后人。

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step1:

npm i @babel/core @babel/plugin-proposal-decorators @babel/preset-env

step2:
项目根目录下创建.babelrc

{
  "presets": ["@babel/preset-env"],
  "plugins": [["@babel/plugin-proposal-decorators", { "legacy": true }]]
}

step3:
项目根目录下创建config-overrides.js

const path = require('path')
const { override, addDecoratorsLegacy } = require('customize-cra')
function resolve(dir) { return path.join(__dirname, dir) }
const customize = () => (config, env) => {
    config.resolve.alias['@'] = resolve('src')
    if (env === 'production') { config.externals = { 'react': 'React', 'react-dom': 'ReactDOM' } }
    return config
}; module.exports = override(addDecoratorsLegacy(), customize())

step4:
npm i customize-cra react-app-rewired

step5:
修改package.json

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

然后重启服务器 再次npm start

bug3

报错 Plugin “react” was conflicted between “package.json …
然后打开package.json ctrl/command + s 就好啦

（最后这里vscode如果出问题，，重启服务器不管用，可以尝试换了一个IDE 比如webstorm）

happy hacking~

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