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If the Promise resolves with a value, the output Observable\n * emits that resolved value as a `next`, and then completes. If the Promise\n * is rejected, then the output Observable emits the corresponding Error.\n *\n * @example <caption>Convert the Promise returned by Fetch to an Observable</caption>\n * var result = Rx.Observable.fromPromise(fetch('http://myserver.com/'));\n * result.subscribe(x => console.log(x), e => console.error(e));\n *\n * @see {@link bindCallback}\n * @see {@link from}\n *\n * @param {PromiseLike<T>} promise The promise to be converted.\n * @param {Scheduler} [scheduler] An optional IScheduler to use for scheduling\n * the delivery of the resolved value (or the rejection).\n * @return {Observable<T>} An Observable which wraps the Promise.\n * @static true\n * @name fromPromise\n * @owner Observable\n */\n static create<T>(promise: PromiseLike<T>, scheduler?: IScheduler): Observable<T> {\n return new PromiseObservable(promise, scheduler);\n }\n\n constructor(private promise: PromiseLike<T>, private scheduler?: IScheduler) {\n super();\n }\n\n /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T>): TeardownLogic {\n const promise = this.promise;\n const scheduler = this.scheduler;\n\n if (scheduler == null) {\n if (this._isScalar) {\n if (!subscriber.closed) {\n subscriber.next(this.value);\n subscriber.complete();\n }\n } else {\n promise.then(\n (value) => {\n this.value = value;\n this._isScalar = true;\n if (!subscriber.closed) {\n subscriber.next(value);\n subscriber.complete();\n }\n },\n (err) => {\n if (!subscriber.closed) {\n subscriber.error(err);\n }\n }\n )\n .then(null, err => {\n // escape the promise trap, throw unhandled errors\n root.setTimeout(() => { throw err; });\n });\n }\n } else {\n if (this._isScalar) {\n if (!subscriber.closed) {\n return scheduler.schedule(dispatchNext, 0, { value: this.value, subscriber });\n }\n } else {\n promise.then(\n (value) => {\n this.value = value;\n this._isScalar = true;\n if (!subscriber.closed) {\n subscriber.add(scheduler.schedule(dispatchNext, 0, { value, subscriber }));\n }\n },\n (err) => {\n if (!subscriber.closed) {\n subscriber.add(scheduler.schedule(dispatchError, 0, { err, subscriber }));\n }\n })\n .then(null, (err) => {\n // escape the promise trap, throw unhandled errors\n root.setTimeout(() => { throw err; });\n });\n }\n }\n }\n}\n\ninterface DispatchNextArg<T> {\n subscriber: Subscriber<T>;\n value: T;\n}\nfunction dispatchNext<T>(arg: DispatchNextArg<T>) {\n const { value, subscriber } = arg;\n if (!subscriber.closed) {\n subscriber.next(value);\n subscriber.complete();\n }\n}\n\ninterface DispatchErrorArg<T> {\n subscriber: Subscriber<T>;\n err: any;\n}\nfunction dispatchError<T>(arg: DispatchErrorArg<T>) {\n const { err, subscriber } = arg;\n if (!subscriber.closed) {\n subscriber.error(err);\n }\n}\n"]}
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