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

module.exports = {
  mode: 'development',

  entry: {
    app: resolve('./app.js')
  },

  devtool: 'source-map',

  module: {
    rules: [{
      // Compile ES2015 using babel
      test: /\.js$/,
      include: [resolve('.')],
      exclude: [/node_modules/],
      use: [{
        loader: 'babel-loader',
        options: {
          presets: [
            '@babel/env',
            '@babel/react'
          ]
        }
      }]
    }]
  },

  // Optional: Enables reading mapbox token from environment variable
  plugins: [
    new HtmlWebpackPlugin({title: 'react-map-gl Example'}),
    new webpack.EnvironmentPlugin(['MapboxAccessToken'])
  ]
};