webpack.config.js

// webpack configuration script.
// Visit here for docs: https://webpack.js.org/concepts

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

module.exports = {
  // src-public/main.js -> public/dist/main.js
  entry: ["./src-public/main.js", "./src-public/styles/main.scss"],
  output: {
    filename: "main.js",
    path: path.resolve(__dirname, "public/dist")
  },
  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env"],
            only: ["./src-public"]
          }
        }
      },
      {
        test: /\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          "css-loader",
          "sass-loader"
        ]
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "main.css"
    })
  ]
};