webpack.config.js

const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
  entry: './source/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'public')
  },
  devtool: 'inline-source-map',
  devServer: {
    contentBase: './public',
    open: true,
    hot: true
  },
  resolve: {
    alias: {
      Leaflet: path.resolve(__dirname, 'node_modules/leaflet/dist')
    }
  },
  plugins: [
    new webpack.NamedModulesPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ],
  module: {
    rules: [
      // styles
      {
        test: /\.(scss|css)$/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader'
        ]
      },
      // images
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: [
          'file-loader'
        ]
      },
      // geojson
      {
        test: /\.geojson$/,
        use: [
          'json-loader'
        ]
      }
    ]
  }
}