Support for the experimental syntax 'decorators-legacy' isn't currently enabled (7:1):

1、产生原因：项目不支持装饰器

2、解决方法：

　　2.1 执行

yarn

　　安装完整依赖；

　　2.2 如果依赖时yarn.lock变化了，并且项目有git目录，则将提示的文件提交到git仓库　　

? Are you sure you want to eject? This action is permanent. Yes
This git repository has untracked files or uncommitted changes:

yarn.lock

　　2.3 执行：

yarn eject

　　2.4 执行

yarn add @babel/plugin-proposal-decorators

　　安装装饰器驱动

　　2.5 将package.json中的babel依赖修改为：

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

　　2.6 执行项目即可。

yarn start

Support for the experimental syntax 'decorators-legacy' isn't currently enabled (7:1):

原文地址：https://www.cnblogs.com/weizhxa/p/11691004.html