webpack.dev.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
const TsconfigPathsPlugin = require('tsconfig-paths-webpack-plugin');
const webpack = require('webpack');
const dotenv = require('dotenv');

const fileEnv = dotenv.config({ path: path.join(__dirname, '.env') }).parsed;

const envKeys = Object.keys(fileEnv).reduce((prev, next) => {
  prev[`process.env.${next}`] = JSON.stringify(fileEnv[next]);
  return prev;
}, {});

module.exports = {
  entry: './src/index.tsx',
  output: {
    path: path.join(__dirname, 'build'),
    filename: 'bundle.js',
  },
  resolve: {
    extensions: ['.js', '.ts', '.tsx', '.scss', '.css'],
    //this allows to use aliases from tsconfig
    plugins: [new TsconfigPathsPlugin()],
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          {
            loader: 'dts-css-modules-loader',
            options: {
              namedExport: true,
              banner: '',
            },
          },
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[path][name]__[local]',
              },
              localsConvention: 'camelCaseOnly',
            },
          },
        ],
      },
    ],
  },
  devtool: 'source-map',
  devServer: {
    contentBase: path.join(__dirname, 'build'),
    historyApiFallback: true,
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: './src/index.html',
    }),
    new ForkTsCheckerWebpackPlugin(),
    new webpack.DefinePlugin(envKeys),
  ],
};