webpack.config.js

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

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ]
  },
  plugins: [
    new webpack.ProvidePlugin({
      process: 'process/browser',
    }),
    new webpack.DefinePlugin({
      'process.env': JSON.stringify(process.env)
    })
  ],
  resolve: {
    fallback: {
      "stream": require.resolve("stream-browserify"),
      "buffer": require.resolve("buffer/"),
      "util": require.resolve("util/"),
      "crypto": require.resolve("crypto-browserify"),
      "http": require.resolve("stream-http"),
      "https": require.resolve("https-browserify"),
      "url": require.resolve("url/"),
      "assert": require.resolve("assert/"),
      "zlib": require.resolve("browserify-zlib")
    }
  },
  mode: 'production'
};