webpack錯誤：plugins[0][1] must be an object, false, or undefined

報錯信息：

ERROR in ./src/index.js
Module build failed (from ./node_modules/[email protected]@babel-loader/lib/index.js):
Error: .plugins[0][1] must be an object, false, or undefined

對比以前寫的，發現babel-loader的版本不一樣，回退到低版本後，運行成功：

npm install  babel-loader@7 babel-core babel-preset-env -D