import { Observable } from 'rxjs';
/**
 * Subscribes the component to an observable and returns its latest value.
 *
 * Until the observable emits, the hook returns `undefined` or the provided
 * initial value. The initial value is also used during server rendering.
 *
 * ```tsx
 * import { useObservable } from '@state-adapt/react';
 * import { interval } from 'rxjs';
 *
 * const tick$ = interval(1000);
 *
 * function Timer() {
 *   const tick = useObservable(tick$);
 *
 *   return <p>{tick}</p>;
 * }
 * ```
 */
export declare function useObservable<T, Args extends [] | [initialValue: NoInfer<T>]>(obs$: Observable<T>, ...args: Args): Args extends [] ? T | undefined : T;