Gulpfile - Babel, watchify, livereload

gulpfile.js

//npm install gulp gulp-connect gulp-util vinyl-source-stream vinyl-buffer lodash.assign babelify watchify browserify --save-dev

var watchify = require('watchify');
var browserify = require('browserify');
var babel = require('babelify');
var gulp = require('gulp');
var connect = require('gulp-connect');
var gutil = require('gulp-util');
var source = require('vinyl-source-stream');
var buffer = require('vinyl-buffer');
var assign = require('lodash.assign');

var filesToReload = ['./index.html', './static/**/*.{css,js}'];//'./*.{html,js}';

// add custom browserify options here
var customOpts = {
	entries: ['./src/js/app.jsx'],
	debug: true
};
var opts = assign({}, watchify.args, customOpts);
var b = watchify(browserify(opts).transform(babel));

gulp.task('js', bundle); // so you can run `gulp js` to build the file
b.on('update', bundle); // on any dep update, runs the bundler
b.on('log', gutil.log); // output build logs to terminal

function bundle() {
	return b.bundle()
		// log errors if they happen
		.on('error', gutil.log.bind(gutil, 'Browserify Error'))
		.pipe(source('app.min.js'))
		// optional, remove if you don't need to buffer file contents
		.pipe(buffer())
		// Add transformation tasks to the pipeline here.
		.pipe(gulp.dest('./static/js/'))
}

gulp.task('connect', function() {
	connect.server({
		livereload: true
	});
});

gulp.task('reload', function () {
	gulp.src(filesToReload)
		.pipe(connect.reload());
});

gulp.task('watch', function () {
	gulp.watch([filesToReload], ['reload']);
});

gulp.task('default', ['js', 'connect', 'watch']);