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