import { MaskOptions } from '../utils';
export declare const MASK_METADATA_KEY: unique symbol;
/**
 * Property decorator using TC39 Stage 3 syntax.
 * Stores masking options in the class metadata under MASK_METADATA_KEY.
 */
export declare function Mask(options?: MaskOptions): (_value: undefined, context: ClassFieldDecoratorContext) => void;
/**
 * Extracts mask metadata from a target class/constructor or object instance.
 */
export declare function getMaskMetadata(target: any): Record<string | symbol, MaskOptions> | null;
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