typescript, scss module react webpackt

webpack.config.js

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const LinkTypePlugin = require("html-webpack-link-type-plugin")
  .HtmlWebpackLinkTypePlugin;
const BundleAnalyzerPlugin = require("webpack-bundle-analyzer")
  .BundleAnalyzerPlugin;
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const { CleanWebpackPlugin } = require("clean-webpack-plugin");
const CopyPlugin = require("copy-webpack-plugin");
const Dotenv = require("dotenv-webpack");
const isDev = process.env.NODE_ENV === "dev";

const config = {
  entry: ["react-hot-loader/patch", "./src/index.tsx"],
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "[name].[contenthash].js",
    publicPath: "/",
  },
  devtool: process.env.NODE_ENV !== "prod" ? "inline-source-map" : "source-map",
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          isDev ? "style-loader" : MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
            options: {
              importLoaders: 1,
            },
          },
          "postcss-loader",
        ],
        exclude: /\.module\.css$/,
      },
      {
        test: /\.(js|jsx|ts|tsx)$/,
        use: "babel-loader",
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        use: [
          isDev ? "style-loader" : MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
            options: {
              importLoaders: 1,
              modules: true,
            },
          },
          "postcss-loader",
        ],
        include: /\.module\.css$/,
      },
      {
        test: /\.scss$/,
        use: [
          isDev ? "style-loader" : MiniCssExtractPlugin.loader,
          "css-loader",
          { loader: "sass-loader", options: { sourceMap: isDev } },
        ],
        exclude: /\.module\.scss$/,
      },
      {
        test: /\.scss$/,
        use: [
          isDev ? "style-loader" : MiniCssExtractPlugin.loader,
          {
            loader: "css-loader",
            options: {
              modules: true,
              sourceMap: isDev,
            },
          },
          {
            loader: "sass-loader",
            options: {
              sourceMap: isDev,
            },
          },
        ],
        include: /\.module\.scss$/,
      },
      {
        test: /\.svg$/,
        use: "file-loader",
      },
      {
        test: /\.png$/,
        use: [
          {
            loader: "url-loader",
            options: {
              mimetype: "image/png",
            },
          },
        ],
      },
    ],
  },
  resolve: {
    extensions: [".js", ".jsx", ".tsx", ".ts"],
    alias: {
      "react-dom": "@hot-loader/react-dom",
      "@": path.resolve(__dirname, "src"),
    },
  },
  plugins: [
    new Dotenv({
      path: "./environments/.env", // load this now instead of the ones in '.env'
      safe: true, // load '.env.example' to verify the '.env' variables are all set. Can also be a string to a different file.
      allowEmptyValues: true, // allow empty variables (e.g. `FOO=`) (treat it as empty string, rather than missing)
      systemvars: true, // load all the predefined 'process.env' variables which will trump anything local per dotenv specs.
      silent: true, // hide any errors
      defaults: false, // load '.env.defaults' as the default values if empty.
    }),
    new MiniCssExtractPlugin({
      filename: "[name].css",
      chunkFilename: "[name].[id].css",
    }),
    new HtmlWebpackPlugin({
      title: "CSA",
      template: "src/index.html",
      favicon: "./public/favicon.ico",
      xhtml: true, // to have /> for self closing tag
    }),
    new LinkTypePlugin({
      "**/*.css": "text/css",
    }),
    new CopyPlugin({
      patterns: [{ from: "src/assets", to: "assets" }],
    }),
    new BundleAnalyzerPlugin({
      analyzerMode: "static",
      openAnalyzer: false,
    }),
    new CleanWebpackPlugin(),
  ],
  devServer: {
    contentBase: "./dist",
    publicPath: "/",
    host: "0.0.0.0",
    port: 48080,
    disableHostCheck: true,
    historyApiFallback: true,
  },
  optimization: {
    runtimeChunk: "single",
    splitChunks: {
      cacheGroups: {
        vendor: {
          test: /[\\/]node_modules[\\/]/,
          name: "vendors",
          chunks: "all",
        },
      },
    },
  },
};

module.exports = (env, argv) => {
  if (argv.hot) {
    // Cannot use 'contenthash' when hot reloading is enabled.
    config.output.filename = "[name].[hash].js";
  }

  return config;
};