import { type Observable, type ObservableInput, Subject } from 'rxjs';
import type { ObservableType } from '../types';
/**
 * Options for the {@link useDebounce} hook.
 *
 * @template TArgs - The argument tuple type.
 */
export type UseDebounceOptions<TArgs extends any[]> = {
    /**
     * Either a numeric millisecond delay, or a function returning an
     * `ObservableInput` that controls the debounce duration per invocation.
     */
    debounce: ((value: TArgs) => ObservableInput<unknown>) | number;
    /** Optional custom `Subject` to use as the internal queue. */
    queuer?: Subject<TArgs>;
};
/**
 * React hook that debounces calls to a function and exposes the results as
 * an observable stream.
 *
 * Returns a `next` function (the debounced trigger), a `value$` observable
 * that emits results, and an `idle` flag indicating whether a debounced
 * call is in-flight.
 *
 * @template TFn - The wrapped function type.
 * @template TType - The return type of `TFn` (must be `ObservableInput`).
 * @template TArgs - The argument tuple.
 * @param fn - The function to debounce.
 * @param options - Debounce configuration.
 * @returns An object with `value$`, `next`, and `idle`.
 *
 * @example
 * ```tsx
 * const { next: search, value$, idle } = useDebounce(
 *   (query: string) => fetch(`/api/search?q=${query}`).then((r) => r.json()),
 *   { debounce: 300 },
 * );
 *
 * useObservableState(value$); // subscribe to results
 * search('fusion');           // triggers debounced fetch
 * ```
 */
export declare const useDebounce: <TFn extends (...args: TArgs) => TType, TType extends ObservableInput<any> = ReturnType<TFn>, TArgs extends any[] = Parameters<TFn>>(fn: TFn, options: UseDebounceOptions<TArgs>) => {
    value$: Observable<TType extends ObservableInput<any> ? ObservableType<TType> : TType>;
    next: (...args: TArgs) => void;
    idle: boolean;
};