webpack.config.js

const webpack = require('webpack');
const path = require('path');

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

const isProduction = process.env.NODE_ENV === 'production';

module.exports = {
  mode: isProduction ? 'production' : 'development',
  bail: isProduction,
  context: path.join(__dirname),
  entry: {
    src: './index.jsx',
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
  },
  resolve: {
    extensions: ['.js', '.jsx'],
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        use: ['babel-loader'],
      },
      {
        test: /\.less$/,
        use: ['style-loader', 'css-loader', 'less-loader'],
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(isProduction ? 'production' : 'development'),
      },
    }),
    new HtmlWebpackPlugin({
      template: 'index.html',
    }),
    new CopyWebpackPlugin({
      patterns: [
        { from: './sample.pdf' },
        { from: 'node_modules/pdfjs-dist/cmaps/', to: 'cmaps/' },
      ],
    }),
  ],
  devServer: {
    compress: true,
    historyApiFallback: true, // respond to 404s with index.html
    host: 'localhost',
    hot: true, // enable HMR on the server
    port: 3000,
  },
  alias: { 'react-pdf': 'react-pdf/build/entry.webpack' },
};