import { Operator } from '../Operator';
import { Observable } from '../Observable';
import { Subscriber } from '../Subscriber';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
export declare class ExpandOperator<T, R> implements Operator<T, R> {
    private project;
    private concurrent;
    constructor(project: (value: T, index: number) => Observable<any>, concurrent?: number);
    call(subscriber: Subscriber<R>): Subscriber<T>;
}
export declare class ExpandSubscriber<T, R> extends OuterSubscriber<T, R> {
    private project;
    private concurrent;
    private index;
    private active;
    private hasCompleted;
    private buffer;
    constructor(destination: Subscriber<R>, project: (value: T, index: number) => Observable<R>, concurrent?: number);
    _next(value: any): void;
    _complete(): void;
    notifyComplete(innerSub?: InnerSubscriber<T, R>): void;
    notifyNext(outerValue: T, innerValue: R, outerIndex: number, innerIndex: number): void;
}