--- /dev/null
+import { Observable } from '../Observable';
+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { OperatorFunction } from '../types';
+export declare function find<T, S extends T>(predicate: (value: T, index: number, source: Observable<T>) => value is S, thisArg?: any): OperatorFunction<T, S | undefined>;
+export declare function find<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any): OperatorFunction<T, T | undefined>;
+export declare class FindValueOperator<T> implements Operator<T, T | number | undefined> {
+ private predicate;
+ private source;
+ private yieldIndex;
+ private thisArg?;
+ constructor(predicate: (value: T, index: number, source: Observable<T>) => boolean, source: Observable<T>, yieldIndex: boolean, thisArg?: any);
+ call(observer: Subscriber<T>, source: any): any;
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export declare class FindValueSubscriber<T> extends Subscriber<T> {
+ private predicate;
+ private source;
+ private yieldIndex;
+ private thisArg?;
+ private index;
+ constructor(destination: Subscriber<T>, predicate: (value: T, index: number, source: Observable<T>) => boolean, source: Observable<T>, yieldIndex: boolean, thisArg?: any);
+ private notifyComplete;
+ protected _next(value: T): void;
+ protected _complete(): void;
+}