import { Observable, type OperatorFunction } from "rxjs";
/**
 * Dynamic counterpart to `switchMap((values) => combineLatest(values.map(...)))`
 * for arrays, with stable branches by value.
 *
 * A single branch is created per unique array value (Map key semantics) and is
 * only created/removed when values are added/removed across emissions. Duplicate
 * values in the same array share the same branch.
 */
export declare function combineLatestByValue<T, R>(project: (value: T) => Observable<R>): OperatorFunction<readonly T[], Map<T, R>>;