/**
 * Update Operation
 *
 * Updates an existing document with access control, validation, password hashing, and JSON field handling.
 */
import type { QueryableDatabaseAdapter, RevealCollectionConfig, RevealDocument, RevealUpdateOptions } from '../../types/index.js';
export declare function update(config: RevealCollectionConfig, db: QueryableDatabaseAdapter | null, options: RevealUpdateOptions): Promise<RevealDocument>;
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