Promise.js

define(["require", "exports", 'dojo/Deferred', 'dojo/promise/Promise', 'dojo/_base/lang', 'dojo/promise/all'], function (require, exports, Deferred, DojoPromise, lang, whenAll) {
    var Promise = (function () {
        function Promise(initializer) {
            var canceler;
            var dfd = new Deferred(function (reason) {
                return canceler && canceler(reason);
            });
            try {
                initializer(function (value) {
                    if (value && value.then) {
                        var promise = value;
                        promise.then(lang.hitch(dfd, 'resolve'), lang.hitch(dfd, 'reject'), lang.hitch(dfd, 'progress'));
                        if (promise.cancel) {
                            canceler = (function (oldCanceler) {
                                return function (reason) {
                                    promise.cancel(reason);
                                    oldCanceler && oldCanceler(reason);
                                };
                            })(canceler);
                        }
                    }
                    else {
                        dfd.resolve(value);
                    }
                }, lang.hitch(dfd, 'reject'), lang.hitch(dfd, 'progress'), function (_canceler) {
                    canceler = _canceler;
                });
            }
            catch (error) {
                dfd.reject(error);
            }
            return dfd.promise;
        }
        Promise.reject = function (error) {
            var dfd = new Deferred();
            dfd.reject(error);
            return dfd.promise;
        };
        Promise.resolve = function (value) {
            if (value instanceof DojoPromise || value instanceof Promise) {
                return value;
            }
            if (value instanceof Deferred) {
                return value.promise;
            }
            return new Promise(function (resolve) {
                resolve(value);
            });
        };
        Promise.all = whenAll;
        Promise.Deferred = Deferred;
        return Promise;
    })();
    return Promise;
});
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