/**
 * Query and entity transformation utilities
 * Handles ID field transformation between MongoDB _id and entity id
 */
/**
 * Repository decorator for automatic query/entity transformations
 * @param transformInputCondition - Whether to transform input conditions (id -> _id)
 * @param transformOutputEntities - Whether to transform output entities (_id -> id)
 */
export declare function Repository(transformInputCondition?: boolean, transformOutputEntities?: boolean): (_target: unknown, _propertyKey: string, descriptor: TypedPropertyDescriptor<(...params: any[]) => Promise<any>>) => void;
/**
 * Transforms query conditions from id to _id format
 * @param cond - Condition object to transform
 * @returns Transformed condition or null if invalid
 */
export declare function transformQueryCondition(cond: Record<string, unknown>): Record<string, unknown> | null;
/**
 * Transforms entities from _id to id format
 * Mutates the entity object(s) in place
 * @param entity - Entity or array of entities to transform
 */
export declare function transformEntities(entity: any): void;