import type { Fingerprint, VaultOptions } from '../types';
/**
 * Persistent fingerprint store. Because a {@link Fingerprint} is fully
 * serialisable and re-applied verbatim, saving one and reloading it in a later
 * session reproduces the exact same browser identity — the key capability that
 * the previous version lacked. Files are plain JSON named `<id>.json`.
 */
export declare class FingerprintVault {
    readonly dir: string;
    constructor(options?: VaultOptions);
    private file;
    private ensureDir;
    /** Persist a fingerprint under `id`. */
    save(id: string, fingerprint: Fingerprint): void;
    /** Load a fingerprint, or `null` if absent / unreadable. */
    load(id: string): Fingerprint | null;
    has(id: string): boolean;
    /** Load `id` if present, otherwise generate via `factory`, persist, and return. */
    loadOrCreate(id: string, factory: () => Fingerprint): Fingerprint;
    delete(id: string): void;
    /** List stored fingerprint ids. */
    list(): string[];
}
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