gulpfile.js

var gulp = require('gulp');
var browserify = require('browserify');
var source = require('vinyl-source-stream');
var reactify = require('reactify');

var production = process.env.NODE_ENV === 'production';

gulp.task('scripts', function () {
  var bundler = browserify('./src/client.js', {basedir: __dirname, debug: !production}});
  bundler.transform(reactify);
  var stream = bundler.bundle();
  return stream
    .pipe(source('bundle.js'))
    .pipe(gulp.dest('./assets/js'));
});