What's the equivalent of Angular's $q in Angular2?

Question

What's the equivalent of Angular's $q in Angular2? Specifically, I'm looking for $q.when, which allowed you to do something like:

return $q.when(['TestResponse']); 

Answer 1

new Promise((resolve, reject) => {    if(xxx) {     resolve('ok');   } else {     reject('error');   } }).then(x => doSomething()) 

See also https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise or http://learnangular2.com/es6/promises