Taro 2.0以上版本使用async-await報錯 'regeneratorRuntime is not defined'

taro版本：2.0.7
github地址：How to resolve regeneratorRuntime is not defined

怎麼發生

在項目中使用async-await後，在VSCode中可以正常編譯通過，但是在微信開發者工具中會報如下的錯：

regeneratorRuntime is not defined
ReferenceError: regeneratorRuntime is not defined
    at http://127.0.0.1:19904/appservice/pages/lucky/lucky.js:186:51
    at http://127.0.0.1:19904/appservice/pages/lucky/lucky.js:230:6
    at Object../node_modules/@tarojs/mini-runner/dist/loaders/wxTransformerLoader.js?!./src/pages/lucky/lucky.jsx?taro&type=script&parse=PAGE& (http://127.0.0.1:19904/appservice/pages/lucky/lucky.js:522:2)
    at __webpack_require__ (http://127.0.0.1:19904/appservice/runtime.js:80:30)
    at Module../src/pages/lucky/lucky.jsx?taro&type=script&parse=PAGE& (http://127.0.0.1:19904/appservice/pages/lucky/lucky.js:1549:173)
    at __webpack_require__ (http://127.0.0.1:19904/appservice/runtime.js:80:30)
    at Module../src/pages/lucky/lucky.jsx (http://127.0.0.1:19904/appservice/pages/lucky/lucky.js:1532:97)
    at __webpack_require__ (http://127.0.0.1:19904/appservice/runtime.js:80:30)
    at checkDeferredModules (http://127.0.0.1:19904/appservice/runtime.js:46:23)
    at Array.webpackJsonpCallback [as push] (http://127.0.0.1:19904/appservice/runtime.js:33:19)

如何解決

• 安裝 babel-plugin-transform-runtime 和 babel-runtime：

  yarn add babel-plugin-transform-runtime --dev
  yarn add babel-runtime
  

• 在項目 config/index.js 的 babel 配置中增加 transform-runtime 配置：

  babel: {
    sourceMap: true,
    presets: [
      [
        'env',
        {
          modules: false
        }
      ]
    ],
    plugins: [
      'transform-decorators-legacy',
      'transform-class-properties',
      'transform-object-rest-spread',
      ['transform-runtime', {
        "helpers": false,
        "polyfill": false,
        "regenerator": true,
        "moduleName": 'babel-runtime'
      }]
    ]
  }
  

至此就以大功告成，可以成功運行了。

Tips：建議將微信開發者工具中的詳情—本地設置—ES6轉ES5和增強編譯勾中。