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'.
原因是:
babel-loader和babel-core版本不對應所產生的,
babel-loader 8.x對應babel-core 7.x
babel-loader 7.x對應babel-core 6.x
也就是說,看你的版本,然后執行
npm i --save-dev babel-loader@7.1.5
你需要自己看一下babel-core的版本,去安裝對應版本的babel-loader。