react 装饰器报错怎么办

npm install -g create-react-app  
// 安装create-react-app，已安装请忽略
create-react-app mobx-study

yarn add -D react-app-rewired customize-cra 
yarn add -D @babel/core @babel/plugin-proposal-decorators @babel/preset-env

// package.json
"scripts": {
    "start": "react-app-rewired start",
    "build": "react-app-rewired build",
    "test": "react-app-rewired test",
    "eject": "react-scripts eject"
  }

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())

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