--- /dev/null
+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;
+}
+/**
+ * @deprecated renamed. Use {@link mergeMap}
+ */
+export declare const flatMap: typeof mergeMap;