From 07ecd5e7c60be32cb00fc97e941535072be54918 Mon Sep 17 00:00:00 2001
From: Robert Raiford <github_rob3c@7b9.com>
Date: Mon, 7 Nov 2016 16:16:36 -0500
Subject: [PATCH] feat(last): support type guards without casting

---
 src/operator/last.ts | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/operator/last.ts b/src/operator/last.ts
index e939c18ce3..3a1ea2269f 100644
--- a/src/operator/last.ts
+++ b/src/operator/last.ts
@@ -21,10 +21,15 @@ import { EmptyError } from '../util/EmptyError';
  * @owner Observable
  */
 /* tslint:disable:max-line-length */
-export function last<T>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => boolean): Observable<T>;
-export function last<T, S extends T>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => value is S): Observable<S>;
+export function last<T, S extends T>(this: Observable<T>,
+                                     predicate?: ((value: T, index: number, source: Observable<T>) => boolean) |
+                                                 ((value: T, index: number, source: Observable<T>) => value is S)): Observable<S>;
 export function last<T>(this: Observable<T>, predicate: (value: T, index: number, source: Observable<T>) => boolean, resultSelector: void, defaultValue?: T): Observable<T>;
-export function last<T, S extends T>(this: Observable<T>, predicate: (value: T, index: number, source: Observable<T>) => value is S, resultSelector: void, defaultValue?: S): Observable<S>;
+export function last<T, S extends T, R>(this: Observable<T>,
+                                        predicate: ((value: T, index: number, source: Observable<T>) => boolean) |
+                                                   ((value: T, index: number, source: Observable<T>) => value is S),
+                                        resultSelector?: ((value: S, index: number) => R) | void,
+                                        defaultValue?: S): Observable<S>;
 export function last<T, R>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => boolean, resultSelector?: (value: T, index: number) => R, defaultValue?: R): Observable<R>;
 /* tslint:disable:max-line-length */
 export function last<T, R>(this: Observable<T>, predicate?: (value: T, index: number, source: Observable<T>) => boolean,