import { MaskOptions } from '../utils';
/**
   * Pattern-based masking helper.
   * Supports:
   *  - '#' reveal char
   *  - '*' mask char (opts.maskChar)
   *  - '{n}' repeat expansion for previous symbol
   * Fault-tolerant: will append masked tail if value longer than pattern.
   */
export declare function maskPattern(value: unknown, pattern: string, options?: Pick<MaskOptions, 'maskChar'>): string;
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