nodemon, express, browser-sync

------------
// app.js
'use strict';
// simple express server
var express = require('express');
var app = express();
var router = express.Router();

app.use(express.static('public'));
app.get('/', function(req, res) {
    res.sendfile('./public/index.html');
});
------------
gulpfile.js
'use strict';

var gulp = require('gulp');
var browserSync = require('browser-sync');
var nodemon = require('gulp-nodemon');


gulp.task('default', ['browser-sync'], function () {
});

gulp.task('browser-sync', ['nodemon'], function() {
	browserSync.init(null, {
		proxy: "http://localhost:5000",
        files: ["public/**/*.*"],
        browser: "google chrome",
        port: 7000,
	});
});
gulp.task('nodemon', function (cb) {
	
	var started = false;
	
	return nodemon({
		script: 'app.js'
	}).on('start', function () {
		// to avoid nodemon being started multiple times
		// thanks @matthisk
		if (!started) {
			cb();
			started = true; 
		} 
	});
});

app.listen(5000);

----------
ref: https://gist.github.com/sogko/b53d33d4f3b40d3b4b2e | https://gist.github.com/kevinSuttle/c8b198aaa30349088c35