/**
 * Update engine – applies MongoDB-style update operators to documents.
 *
 * Supports:
 *   $set, $unset, $inc, $push, $pull, $addToSet,
 *   $min, $max, $rename, $currentDate, $mul, $pop
 */
import type { UpdateQuery } from '@digitaldefiance/suite-core-lib';
import type { BsonDocument } from '../interfaces/storage/documentTypes';
/**
 * Check whether an update document uses operators ($set, $inc, etc.)
 * vs. being a plain replacement document.
 */
export declare function isOperatorUpdate<T>(update: UpdateQuery<T>): boolean;
/**
 * Apply update operators to a document and return the mutated copy.
 * The original document is not modified.
 */
export declare function applyUpdate<T extends BsonDocument>(doc: T, update: UpdateQuery<T>): T;
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