webpack.config.js

const path = require('path');
const webpack = require('webpack');
const DefinePlugin = webpack.DefinePlugin;
const HTMLPlugin = require('html-webpack-plugin');

const resolve = (relative) => path.resolve(__dirname, relative);

module.exports = {
  entry: resolve('./src/index.jsx'),
  output: {
    path: resolve('./dist'),
    filename: 'bundle.js',
  },
  resolve: {
    extensions: ['.js', '.jsx', '.css', '.less'],
  },
  module: {
    rules: [
      {
        use: 'babel-loader',
        include: [
          resolve('./src'),
        ],
        test: /\.jsx?$/,
      },
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader',
        include: /flexboxgrid/
      },
      {
        use: [
          'style-loader',
          'css-loader',
          'less-loader',
        ],
        exclude: /flexboxgrid/,
        test: /\.(css|less)$/,
      },
    ],
  },
  plugins: [
    new HTMLPlugin({
      template: resolve('./src/index.html'),
    }),
    new DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify(process.env.NODE_ENV),
      },
    }),
  ],
  devtool: 'source-map',
};