Sleep.js

        var sleep = function sleep(ms) {
            var date = Date.now();
            var currentDate = null;
            do {
                currentDate = Date.now();
            } while (currentDate - date < ms);
        };
 
        var sleepPromise = function newSleep(ms)
        {
            return new Promise(function (resolve) {
                setTimeout(resolve, ms);
            });
        }