BREAKING CHANGE: It's no longer allowed to omit the '-loader' suffix when using loaders.
You need to specify 'style-loader' instead of 'style',
see https://webpack.js.org/guides/migrating/#automatic-loader-module-name-extension-removed
Webpack新版本要求配置module中的loader不能缩写,也就是loader:"style-loader"中的-loader必须要写
类似的还有loaders:['babel-loader','css-loader','sass-loader']
坑惨我了