import { RefObject } from 'react';
import { Observable } from 'rxjs';
/**
 * Returns a `ref` object whose `current` value is always the latest value emitted by the provided observable.
 *
 * Note that if the observable changes, the value is not reset. Therefore if the new observable is asynchronous,
 * the ref will still have value of the previous observable until the new one emits.
 *
 * @param observable observable to subscribe to and whose emissions should be kept in the ref
 * @param initialValue an initial value of the ref to be used while waiting for the observable to emit (if it is async)
 * @typeParam T type of the emitted value
 * @category Hook
 */
export declare function useLastEmitRef<T>(observable: Observable<T>, initialValue: T): RefObject<T>;
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