config-overrides.js

const webpack = require('webpack'); 
const NodePolyfillPlugin = require('node-polyfill-webpack-plugin');


module.exports = function override(config) { 
  const fallback = config.resolve.fallback || {}; 
  Object.assign(fallback, { 
    "crypto": require.resolve("crypto-browserify"), 
    "stream": require.resolve("stream-browserify"), 
    "assert": require.resolve("assert"), 
    "http": require.resolve("stream-http"), 
    "https": require.resolve("https-browserify"), 
    "os": require.resolve("os-browserify"), 
    "url": require.resolve("url"),
    "path": require.resolve("path-browserify"),
    "vm": require.resolve("vm-browserify"),
    "process": require.resolve("process/browser"),
  }) 
  config.resolve.fallback = fallback; 
  config.plugins = (config.plugins || []).concat([ 
    new webpack.ProvidePlugin({ 
      process: 'process/browser', 
      Buffer: ['buffer', 'Buffer'] 
    }),
    new NodePolyfillPlugin() 
  ]) 
  return config; 
}