[Octane]

Можно наружу вытащить, если Deferred привычнее

function doSomething() {
    
    var deferred = {};
    deferred.promise = new Promise(function (resolve, reject) {
        deferred.resolve = resolve;
        deferred.reject = reject;
    });
    
    window.setTimeout(function () {
        deferred.resolve('value');
    }, 100500);

    return deferred.promise;
}