import type { ValidationOptions } from 'class-validator';
/**
 * Decorator that transforms json to and from corresponding record.
 *
 * @example
 * class Example {
 *   RecordTransformer(Service)
 *   private services: Record<string, Service>;
 * }
 */
export declare function RecordTransformer<T>(Class: {
    new (...args: any[]): T;
}): PropertyDecorator;
export declare function MetadataTransformer(): PropertyDecorator;
/**
 * Decorator that transforms to and from a date instance.
 */
export declare function DateTransformer(): PropertyDecorator;
export declare function DateParser(value: string): Date;
/**
 * Checks if a given value is a Map
 */
export declare function IsMap(validationOptions?: ValidationOptions): PropertyDecorator;
/**
 * Checks if a given value is a string or string array.
 */
export declare function IsStringOrStringArray(validationOptions?: Omit<ValidationOptions, 'each'>): PropertyDecorator;