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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;
}
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