/** Mapping store interface and in-memory implementation. */
import { Category } from "./types.js";
/** Abstract store interface for real↔fake mappings. */
export interface MappingStore {
    put(real: string, fake: string, category: Category): void;
    getFake(real: string): string | undefined;
    getReal(fake: string): string | undefined;
    getCategory(real: string): Category | undefined;
    allMappings(): Map<string, string>;
    size(): number;
    clear(): void;
}
/** Serialized form of a mapping store — used for session export/import. */
export interface SerializedStore {
    mappings: [string, string, string][];
    salt: string;
    tenantId?: string;
    exportedAt: string;
}
export declare class MemoryStore implements MappingStore {
    private _realToFake;
    private _fakeToReal;
    private _categories;
    /** Insertion-order list for LRU eviction (oldest first). */
    private _insertionOrder;
    /** Max store size (0 = unlimited). QW10. */
    private _maxSize;
    constructor(maxSize?: number);
    put(real: string, fake: string, category: Category): void;
    getFake(real: string): string | undefined;
    getReal(fake: string): string | undefined;
    getCategory(real: string): Category | undefined;
    allMappings(): Map<string, string>;
    size(): number;
    clear(): void;
    /** Export all mappings for serialization. */
    export(salt: string, tenantId?: string): SerializedStore;
    /** Import mappings from a session export. */
    import(data: SerializedStore): void;
}