MyConfig-2.d.ts

import * as webpack from 'webpack'

interface Config extends webpack.Configuration {
  module: {
    rules: webpack.NewUseRule[]
  }
}
const config: Config = {
  module: {
    rules: [{
      test: /\.css$/,      // Match any files that end with ".css"
      use: 'style-loader', // Pipe these files through style-loader upon import
    }]
  }
}
export default config