webpack.config.js

const HtmlWebpackPlugin = require("html-webpack-plugin");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");

const path = require("path");

const outputDir = path.join(__dirname, "build");
const publicDir = path.join(__dirname, "public");

const isProd = process.env.NODE_ENV === "production";

module.exports = {
  entry: "./src/Index.bs.js",
  mode: isProd ? "production" : "development",
  output: {
    path: outputDir,
    filename: "bundle.js"
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: "style-loader"
          },
          {
            loader: "css-loader",
            options: {
              modules: {
                localIdentName: "[local]-[hash:base64]"
              }
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: path.join(__dirname, "src/index.html")
    })
  ],

  devServer: {
    contentBase: publicDir,
    historyApiFallback: true
  }
};