webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"]
      },
      {
        test: /\.(gif|png|jpe?g)$/i,
        use: [
          "file-loader",
          {
            loader: "image-webpack-loader",
            options: {
              bypassOnDebug: true, // webpack@1.x
              disable: true // webpack@2.x and newer
            }
          }
        ]
      }
    ]
  }
};