webpack.config.js

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

module.exports = {
  entry: ["@babel/polyfill", "./src/js/index.js"],
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "js/bundle.js"
  },
  devServer: {
    contentBase: "./dist",
    host: "0.0.0.0"
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: "index.html",
      template: "./src/index.html"
    }),
    new MiniCssExtractPlugin({
      filename: "[name].css",
      chunkFilename: "[id].css"
    })
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader"
        }
      },
      {
        test: /\.(sa|sc|c)ss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              hmr: process.env.NODE_ENV === "development"
            }
          },
          "css-loader",
          "postcss-loader",
          {
            loader: "sass-loader",
            options: {
              sourceMap: true,
              sourceMapContents: false
            }
          }
        ]
      },
      {
        test: /\.(png|jpg|jpeg|gif|ico|svg)$/,
        use: [
          {
            loader: "file-loader",
            options: {
              name: "img/[name].[ext]"
            }
          }
        ]
      }
    ]
  }
};