gulpfile.js

var gulp = require('gulp');
var fs = require('fs');
var browserify = require('browserify');
var watchify = require('watchify');
var babelify = require('babelify');
var rimraf = require('rimraf');
var source = require('vinyl-source-stream');
var _ = require('lodash');
var browserSync = require('browser-sync');
var reload = browserSync.reload;
var nodemon = require('gulp-nodemon');
var buffer = require('vinyl-buffer');
var minify = require('gulp-minify');

var config = {
  entryFile: './client/main.js',
  outputDir: './public/dist/',
  outputFile: 'app.js'
};

// clean the output directory
gulp.task('clean', function(cb){
    rimraf(config.outputDir, cb);
});

var bundler;
function getBundler() {
  if (!bundler) {
    bundler = watchify(browserify(config.entryFile, _.extend({ debug: true }, watchify.args)));
  }
  return bundler;
};

function bundle() {
  return getBundler()
    .transform(babelify)
    .bundle()
    .on('error', function(err) { console.log('Error: ' + err.message); })
    .pipe(source(config.outputFile))
    .pipe(buffer())
    .pipe(minify({
      ext:{
        src:'.js',
        min:'.min.js'
      }
    }))
    .pipe(gulp.dest(config.outputDir))
    .pipe(reload({ stream: true }));
}

gulp.task('build-persistent', function() {
  return bundle();
});

gulp.task('build', ['build-persistent'], function() {
  process.exit(0);
});

gulp.task('nodemon', function (cb) {
	
	var started = false;
	
	return nodemon({
		script: 'bin/www',
        ignore: ["public/*", "data/*", "client/*", "*.jade"]
	}).on('start', function () {
		if (!started) {
			cb();
			started = true; 
		} 
	});
});

gulp.task('watch', ['build-persistent', 'nodemon'], function() {

  browserSync.init(null, {
		proxy: "http://localhost:8000",
        port: 7000,
	});

  getBundler().on('update', function() {
    gulp.start('build-persistent')
  });
});

// WEB SERVER
gulp.task('serve', ['nodemon'], function () {
  browserSync.init(null, {
		proxy: "http://localhost:8000",
        port: 7000,
	});
});