Babel 7 转码（七）- 支持装饰器语法

安装依赖

yarn add @babel/plugin-proposal-decorators @babel/plugin-proposal-class-properties -D

.babelrc 增加配置

{
  assumptions: {
    /**
     * https://babeljs.io/docs/en/assumptions#setpublicclassfields
    *
    * 装饰器的 legancy: true，依赖此配置
    *  - https://babeljs.io/docs/en/babel-plugin-proposal-decorators#legacy
    */
    setPublicClassFields: true,
  },
  "presets": [],
  "plugins": [
    [
      // @babel/plugin-proposal-decorators 需要在 @babel/plugin-proposal-class-properties 之前
      '@babel/plugin-proposal-decorators',
      {
        legacy: true, // 推荐
      },
    ],
    ['@babel/plugin-proposal-class-properties'],
  ]
}