webpack4 打包報錯 :regeneratorRuntime is not defined

使用async函數，在webpack打包時報錯

babel-polyfill is required. You must also install it in order to get async/await working.

需要加入babel-polyfill

npm i -D babel-polyfill

這里有個小插曲，經測試發現yarn 無法安裝css-loader 1.0.0，

而且若先用npm安裝完css-loader后用yarn安裝其他包也會報錯，可用npm安裝

在webpack.config.js 的entry選項中

entry: ['babel-polyfill',join("./src/main.js")],

 

參考鏈接：https://stackoverflow.com/questions/33527653/babel-6-regeneratorruntime-is-not-defined