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

tetsuharuohzeki · tetsuharuohzeki · commit b952718d35dd · 2016-09-16T18:30:11.000+09:00
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> {

Original file line number	Diff line number	Diff line change
`@@ -45,6 +45,7 @@ export function find<T>(predicate: (value: T, index: number, source: Observable<`
`45`	`45`
`46`	`46`	`export interface FindSignature<T> {`
`47`	`47`	`(predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): Observable<T>;`
	`48`	`+ <S extends T>(predicate: (value: T, index: number, source: Observable<T>) => value is S, thisArg?: any): Observable<S>;`
`48`	`49`	`}`
`49`	`50`
`50`	`51`	`export class FindValueOperator<T> implements Operator<T, T> {`