webpack.config.js

const path = require('path');
const webpack = require('webpack');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  mode: 'production',
  entry: './www/main/index.js',
  output: {
    path: path.resolve(__dirname, 'www'),
    filename: 'index.bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
        ],
      },
      {
        test: /\.(png|jpe?g|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              outputPath: 'img',
            },
          },
        ],
      },
    ]
}, 
  plugins: [
    new webpack.ProvidePlugin({
      L: 'leaflet',
    }),
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // all options are optional
      filename: 'index.bundle.css',
      chunkFilename: '[id].css',
      ignoreOrder: false, // Enable to remove warnings about conflicting order
    }), 
  ],
  //devtool: 'inline-source-map',
};