webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

module.exports = {
  entry: [
    path.resolve(__dirname, 'src/assetbundles/coachmarks/src/js/coachmarks.js'),
    path.resolve(__dirname, 'src/assetbundles/coachmarks/src/scss/coachmarks.scss')
  ],
  output: {
    path: path.resolve(__dirname, 'src/assetbundles/coachmarks/dist'),
    filename: "js/[name].js"
  },
  mode: 'development',
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: ['babel-loader']
      },
      {
        test: /\.css$/,
        use: [
          { loader: "style-loader" },
          { loader: "css-loader" }
        ]
      },
      {
        test: /\.scss$/,
        use: [
          "style-loader",
          MiniCssExtractPlugin.loader,
          "css-loader",
          "sass-loader"
        ]
      },
    ]
  },
  resolve: {
    extensions: ['*', '.js', '.jsx']
  },
  plugins: [
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // both options are optional
      filename: 'css/[name].css',
    })
  ]
};