feat(find): Observable<T>.find() can take type guard as the predicate…

… function
ReactiveX · Sep 16, 2016 · b952718 · b952718
1 parent d62fbf0
commit b952718
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/operator/find.ts b/src/operator/find.ts
@@ -45,6 +45,7 @@ export function find<T>(predicate: (value: T, index: number, source: Observable<
 
 export interface FindSignature<T> {
   (predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): Observable<T>;
+  <S extends T>(predicate: (value: T, index: number, source: Observable<T>) => value is S, thisArg?: any): Observable<S>;
 }
 
 export class FindValueOperator<T> implements Operator<T, T> {