import { Observable, ObservableInput, SubscribableOrPromise } from '../Observable';
import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
/**
 * Projects each source value to the same Observable which is merged multiple
 * times in the output Observable.
 *
 * <span class="informal">It's like {@link mergeMap}, but maps each value always
 * to the same inner Observable.</span>
 *
 * <img src="./img/mergeMapTo.png" width="100%">
 *
 * Maps each source value to the given Observable `innerObservable` regardless
 * of the source value, and then merges those resulting Observables into one
 * single Observable, which is the output Observable.
 *
 * @example <caption>For each click event, start an interval Observable ticking every 1 second</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.mergeMapTo(Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMapTo}
 * @see {@link merge}
 * @see {@link mergeAll}
 * @see {@link mergeMap}
 * @see {@link mergeScan}
 * @see {@link switchMapTo}
 *
 * @param {Observable} innerObservable An Observable to replace each value from
 * the source Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
 * Observables being subscribed to concurrently.
 * @return {Observable} An Observable that emits items from the given
 * `innerObservable` (and optionally transformed through `resultSelector`) every
 * time a value is emitted on the source Observable.
 * @method mergeMapTo
 * @owner Observable
 */
export declare function mergeMapTo<T, I, R>(innerObservable: Observable<I>, resultSelector?: ((outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R) | number, concurrent?: number): Observable<R>;
export interface MergeMapToSignature<T> {
    <R>(observable: ObservableInput<R>, concurrent?: number): Observable<R>;
    <I, R>(observable: ObservableInput<I>, resultSelector: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R, concurrent?: number): Observable<R>;
}
export declare class MergeMapToOperator<T, I, R> implements Operator<Observable<T>, R> {
    private ish;
    private resultSelector;
    private concurrent;
    constructor(ish: SubscribableOrPromise<I>, resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R, concurrent?: number);
    call(observer: Subscriber<R>, source: any): any;
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
export declare class MergeMapToSubscriber<T, I, R> extends OuterSubscriber<T, I> {
    private ish;
    private resultSelector;
    private concurrent;
    private hasCompleted;
    private buffer;
    private active;
    protected index: number;
    constructor(destination: Subscriber<R>, ish: SubscribableOrPromise<I>, resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R, concurrent?: number);
    protected _next(value: any): void;
    private _innerSub(ish, destination, resultSelector, value, index);
    protected _complete(): void;
    notifyNext(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number, innerSub: InnerSubscriber<T, I>): void;
    private trySelectResult(outerValue, innerValue, outerIndex, innerIndex);
    notifyError(err: any): void;
    notifyComplete(innerSub: Subscription): void;
}