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import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
import { ObservableInput, OperatorFunction, ObservedValueOf } from '../types';
export declare function mergeMap<T, O extends ObservableInput<any>>(project: (value: T, index: number) => O, concurrent?: number): OperatorFunction<T, ObservedValueOf<O>>;
/** @deprecated resultSelector no longer supported, use inner map instead */
export declare function mergeMap<T, O extends ObservableInput<any>>(project: (value: T, index: number) => O, resultSelector: undefined, concurrent?: number): OperatorFunction<T, ObservedValueOf<O>>;
/** @deprecated resultSelector no longer supported, use inner map instead */
export declare function mergeMap<T, R, O extends ObservableInput<any>>(project: (value: T, index: number) => O, resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R, concurrent?: number): OperatorFunction<T, R>;
export declare class MergeMapOperator<T, R> implements Operator<T, R> {
private project;
private concurrent;
constructor(project: (value: T, index: number) => ObservableInput<R>, concurrent?: number);
call(observer: Subscriber<R>, source: any): any;
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
export declare class MergeMapSubscriber<T, R> extends OuterSubscriber<T, R> {
private project;
private concurrent;
private hasCompleted;
private buffer;
private active;
protected index: number;
constructor(destination: Subscriber<R>, project: (value: T, index: number) => ObservableInput<R>, concurrent?: number);
protected _next(value: T): void;
protected _tryNext(value: T): void;
private _innerSub;
protected _complete(): void;
notifyNext(outerValue: T, innerValue: R, outerIndex: number, innerIndex: number, innerSub: InnerSubscriber<T, R>): void;
notifyComplete(innerSub: Subscription): void;
}
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