config-overrides.js

// @ts-ignore
const webpack = require('webpack');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = (config, env) => {
  // Resto de tu configuración...

  // Verifica si resolve.fallback ya está definido
  if (!config.resolve.fallback) {
    config.resolve.fallback = {
      process: require.resolve('process/browser'),
      stream: require.resolve('stream-browserify'),
      fs: require.resolve('browserify-fs'),
      path: require.resolve('path-browserify'),
      assert: require.resolve('assert'),
      http: require.resolve('http-browserify'),
      https: require.resolve('https-browserify'),
      os: require.resolve('os-browserify'),
      zlib: require.resolve('browserify-zlib'),
    };
  } else {
    config.resolve.fallback.process = require.resolve('process');
    config.resolve.fallback.stream = require.resolve('stream-browserify');
    config.resolve.fallback.fs = require.resolve('browserify-fs');
    config.resolve.fallback.path = require.resolve('path-browserify');
    config.resolve.fallback.assert = require.resolve('assert');
    config.resolve.fallback.http = require.resolve('http-browserify');
    config.resolve.fallback.https = require.resolve('https-browserify');
    config.resolve.fallback.os = require.resolve('os-browserify');
    config.resolve.fallback.zlib = require.resolve('browserify-zlib');
  }

  config.resolve.fallback.Buffer = require.resolve('buffer');

  // Agrega el plugin ProvidePlugin para process
  config.plugins.push(
    new webpack.ProvidePlugin({
      Buffer: ['buffer', 'Buffer'],
      process: 'process',
    })
  );
  if (process.env.REACT_APP_ENV === 'dev') {
    config.plugins.push(new BundleAnalyzerPlugin({
      analyzerMode: 'disabled',
      generateStatsFile: true,
      statsOptions: {
        source: false
      }
    }))
  }

  return config;
};