gulpfile.js

var gulp = require('gulp');
var uglify = require('gulp-uglify');
var gutil = require('gulp-util');
var htmlreplace = require('gulp-html-replace');
var source = require('vinyl-source-stream');
var browserify = require('browserify');
var watchify = require('watchify');
var reactify = require('reactify');
var streamify = require('gulp-streamify');
var lessify = require('lessify');
var bulkify = require('bulkify');

var path = {
  HTML: 'public/index.html',
  MINIFIED_OUT: 'build.min.js',
  OUT: 'build.js',
  DEST: 'public/dist',
  DEST_BUILD: 'public/dist/build',
  DEST_SRC: 'public/dist/src',
  ENTRY_POINT: './public/app/app.js'
};

gulp.task('watch', function() {
  var watcher  = watchify(browserify({
    entries: [path.ENTRY_POINT],
    transform: [reactify, lessify, bulkify],
    debug: true,
    cache: {}, packageCache: {}, fullPaths: true
  }));

  return watcher
    .on('update', function () {
      watcher
        .bundle()
        .on('error', gutil.log.bind(gutil, 'Browserify Error'))
        .pipe(source(path.OUT))
        .pipe(gulp.dest(path.DEST_SRC))
        console.log('Updated');
    })
    .on('transform', function (tr, file) {
      console.log('^.^: ', file);
    })
    .bundle()
    .on('error', gutil.log.bind(gutil, 'Browserify Error'))
    .pipe(source(path.OUT))
    .pipe(gulp.dest(path.DEST_SRC));
});

gulp.task('build', function(){
  browserify({
    entries: [path.ENTRY_POINT],
    transform: [reactify, lessify, bulkify],
  })
  .bundle()
  .pipe(source(path.OUT))
  .pipe(gulp.dest(path.DEST_SRC));
});
//
// gulp.task('replaceHTML', function(){
//   gulp.src(path.HTML)
//     .pipe(htmlreplace({
//       'js': 'build/' + path.MINIFIED_OUT
//     }))
//     .pipe(gulp.dest(path.DEST));
// });

// gulp.task('production', ['replaceHTML', 'build']);
gulp.task('default', ['watch']);