webpack.config.js

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

const { name } = require('./package.json');

const { NODE_ENV = 'dev' } = process.env;
const IS_DEV = NODE_ENV === 'dev';
const dirNode = 'node_modules';
const dirApp = path.join(__dirname, 'examples', 'react', 'src');
const dirAssets = path.join(__dirname, 'assets');
const appHtmlTitle = name;

const { banner } = require('./components/Utils');

/**
 * Webpack Configuration
 */
module.exports = {
  entry: {
    // // defaulted to render hooks, uncomment for classes
    // bundle: path.join(dirApp, 'index'),
    bundle: path.join(dirApp, 'hooks'),
  },
  resolve: {
    modules: [dirNode, dirApp, dirAssets],
  },
  plugins: [
    // // Throws warning: Conflicting values for 'process.env.NODE_ENV' 
    // new webpack.DefinePlugin({
    //   'process.env.NODE_ENV': JSON.stringify(NODE_ENV),
    //   NODE_ENV,
    //   IS_DEV,
    // }),

    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'index.ejs'),
      title: appHtmlTitle,
    }),

    new webpack.BannerPlugin({
      banner,
      raw: true,
      entryOnly: true,
    }),
  ],
  module: {
    rules: [
      // BABEL
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /(node_modules)/,
        options: {
          compact: true,
          sourceMap: IS_DEV,
        },
      },

      // STYLES
      {
        test: /\.css$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              sourceMap: IS_DEV,
            },
          },
        ],
      },

      // CSS / SASS
      {
        test: /\.scss/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              sourceMap: IS_DEV,
            },
          },
          {
            loader: 'sass-loader',
            options: {
              sourceMap: IS_DEV,
              includePaths: [dirAssets],
            },
          },
        ],
      },

      // IMAGES
      {
        test: /\.(jpe?g|png|gif)$/,
        loader: 'file-loader',
        options: {
          name: '[path][name].[ext]',
        },
      },
    ],
  },
};