Use PromiseConstructorLike and PromiseLike for operators/toPromise

[cartant]

The overload signatures for the new operators/toPromise function include:

export function toPromise<T>(PromiseCtor: typeof Promise): UnaryFunction<Observable<T>, Promise<T>>;

If the intention is to allow for the use of an arbitrary promise implementation, this seems overly specific.

PromiseConstructorLike and PromiseLike could be used instead:

export function toPromise<T>(PromiseCtor: PromiseConstructorLike): UnaryFunction<Observable<T>, PromiseLike<T>>;

RxJS version: 5.5.0-beta.3

Code to reproduce:

import { Promise as Bluebird } from "bluebird";
import { toPromise } from "rxjs/operators";

const func = toPromise(Bluebird);

Expected behavior:

No error.

Actual behavior:

An error is effected, as Bluebird does not include the Symbol.species property.

Additional information:

Since at least version 2.0.10, TypeScript's in-built typings have included PromiseLike and PromiseConstructorLike.

[lock]

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