import type { MaskOptions } from '../utils/types';
export interface DeterministicOptions extends MaskOptions {
    /**
     * REQUIRED: Secret key for HMAC hashing.
     * MUST be stored in environment variable, NEVER committed to version control.
     */
    secret: string;
    algorithm?: 'sha256' | 'sha512';
    length?: number;
}
/**
 * Generates a consistent, non-reversible hash for analytics/tracking (Synchronous).
 * Only supported in Node.js.
 */
export declare function maskDeterministic(value: string, opts?: DeterministicOptions): string;
/**
 * Generates a consistent, non-reversible hash for analytics/tracking (Asynchronous).
 * Supported in both Node.js and Browser environments.
 */
export declare function maskDeterministicAsync(value: string, opts?: DeterministicOptions): Promise<string>;
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