babel-loader@8 requires Babel 7.x (the package ‘@babel/core’). If you’d like to use Babel 6.x (‘bab

报错信息：babel-loader@8 requires Babel 7.x (the package @babel/core ). If you d like to use Babel 6.x ( babel-core ), you should install babel-loader@7 .

报错缘由：

babel-loader和babel-core版本不对应所产生的，
babel-loader 8.x对应babel-core 7.x
babel-loader 7.x对应babel-core 6.x

解决过程：

去package.json里面查看你安装的babel-loader和babel-core的版本是否对应

解决办法：

卸载旧的babel-core 7.x

npm un babel-core

安装babel-core 7.x

npm i  @babel/core --save-dev

Cannot find module @babel/core babel-loader@8 requires Babel 7.x (the package @babel/core ). If you d like to use Babel 6.x ( babel-core ), you should install babel-loader@7 .ou should install babel-loader@7 .

缘由是：
babel-loader和babel-core版本不对应所产生的，
babel-loader 8.x对应babel-core 7.x
babel-loader 7.x对应babel-core 6.x

也就是说，看你的版本，然后执行

npm i –save-dev babel-loader@7.1.5

你需要自己看一下babel-core的版本，去安装对应版本的babel-loader。

摘自：https://www.cnblogs.com/hoyong/articles/11057993.html