/**
 * Session-isolated store that maps [TAG:N] tokens to their original values.
 *
 * The `add()` method is idempotent: if the same original value is added
 * under the same tag more than once, the existing token is returned,
 * preserving reference coherence in the masked text.
 */
export declare class MappingStore {
    private readonly sessionId;
    private readonly store;
    private readonly counters;
    constructor(sessionId?: string);
    getSessionId(): string;
    /**
     * Register an original value and return its token `[TAG:N]`.
     * If the same original+tag combination was already registered,
     * the existing token is returned (idempotent).
     */
    add(tag: string, original: string): string;
    get(token: string): string | undefined;
    getAll(): ReadonlyMap<string, string>;
    clear(): void;
}
//# sourceMappingURL=mapping-store.d.ts.map