webpack.config.js

const path = require("path");
const webpack = require("webpack");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const ProgressBarPlugin = require('progress-bar-webpack-plugin');
const chalk = require("chalk");

const OUTPUT_DIR = path.resolve(__dirname, "build");

module.exports = (env, arg) =>  ({
  entry: './src/app/index',
  output: {
    path: OUTPUT_DIR,
    filename: 'bundle.js'
  },
  plugins: [
    new ProgressBarPlugin({
      format: '  build [:bar] ' + chalk.green.bold(':percent') + ' (:elapsed seconds)',
      clear: false
    }),
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      filename: "index.html",
      template: path.join(__dirname, "src", "index.html")
    }),
    new MiniCssExtractPlugin({
      filename: "[name].css",
      chunkFilename: "[id].css"
    }),
    new webpack.ProvidePlugin({
      $: 'jquery',
      jQuery: 'jquery',
      Popper: 'popper.js'
    }),
    new webpack.DefinePlugin({
      'process.env': {
        API_URL: JSON.stringify(process.env.API_URL),
      },
    }),
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: ['babel-loader', 'eslint-loader'],
      },
      {
        test: /.(css|scss)$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              esModule: true,
            },
          },
          {
            loader: "css-loader",
            options: {
              modules: {
                auto: true,
                localIdentName: '[path]__[name]__[local]--[hash:base64:5]',
                context: path.resolve(__dirname, 'src'),
                hashPrefix: 'my-custom-hash',
              },
            },
          },
          {
            loader: "sass-loader",
          },
        ],
      },
      {
        test: /.(jpg|jpeg|png|gif|svg)$/,
        use: [
          {
            loader: "file-loader",
            options: {
              name: "[path][name]-[hash:8].[ext]"
            }
          }
        ]
      }
    ],
  },
  devtool: arg.mode === 'development' ? 'source-map' : 'false',
  resolve: {
    alias: {
      app: path.resolve(__dirname, 'src/app'),
      components: path.resolve(__dirname, 'src/app/components'),
      constants: path.resolve(__dirname, 'src/app/constants'),
    },
  },
  devServer: {
    host: "localhost",
    contentBase: OUTPUT_DIR,
    compress: true,
    port: 3003,
    stats: "errors-only",
    disableHostCheck: true,
  },
});