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gulpfile.js

 var paths = {
  main: './client/client.js',
  jsx: './common/components/**/*.jsx',
  publicJs: './public/js',
  server: './server/server.js',
  serverIgnore: [
    'gulpfile.js',
    'public/',
    'components/**/*.styl',
    'bower_components/',
    'node_modules/'
  ],
  syncWatch: [
    'public/**/*.*',
    '!public/js/bundle.js'
  ]
};
 
 var b = browserify(config);
  bundleLogger.start('bundle.js');

  b.transform(envify({
    NODE_ENV: 'development'
  }));

  b = watchify(b);
  b.on('update', function() {
    bundleItUp(b);
  });

  b.on('time', function(time) {
    if (!called) {
      called = true;
      cb();
    }
    debug('bundle completed in %s ms', time);
    _reload();
  });

  b.on('error', function(e) {
    debug('bundler error', e);
  });

  b.add(paths.main);
  bundleItUp(b);
}

function bundleItUp(b) {
  debug('Bundling');
  return b.bundle()
    .on('error', handleErrors)
    .pipe(bundleName('bundle.js'))
    .pipe(gulp.dest(paths.publicJs));
}