/**
 * In-Memory Storage Backend
 *
 * Stores all data in memory using a Map. Useful for:
 * - Testing without file system
 * - Small datasets that fit in memory
 * - Browser environments without OPFS/IndexedDB
 * - Temporary caches
 */
import type { StorageBackend } from './StorageBackend.js';
export declare class MemoryBackend implements StorageBackend {
    readonly type = "memory";
    private storage;
    private directories;
    constructor();
    read(key: string): Promise<ArrayBuffer | null>;
    write(key: string, data: ArrayBuffer | Uint8Array): Promise<void>;
    append(key: string, data: ArrayBuffer | Uint8Array): Promise<void>;
    delete(key: string): Promise<void>;
    exists(key: string): Promise<boolean>;
    list(prefix?: string): Promise<string[]>;
    mkdir(path: string): Promise<void>;
    /**
     * Clear all data
     */
    clear(): void;
    /**
     * Get memory usage statistics
     */
    getStats(): {
        keyCount: number;
        totalBytes: number;
    };
    /**
     * Export all data as a serializable object
     * Useful for debugging or saving state
     */
    export(): Record<string, ArrayBuffer>;
    /**
     * Import data from a serializable object
     */
    import(data: Record<string, ArrayBuffer>): void;
}
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