import type { PartialObserver } from './types/inputs/Observer.js';
import type { StrictObserver } from './types/outputs/StrictObserver.js';
/**
 * Utility to simplify strict observer creation
 *
 * @since 1.0.0
 * @see StrictObserver
 */
export declare function observer$<D>(input: PartialObserver<D>): StrictObserver<D>;