import type { Database } from './types.js';
/**
 * In-memory database store for development and testing.
 * Supports list operations for message history and enumeration for settings.
 * Data is lost when the process restarts.
 */
export declare class MemoryDatabaseStore implements Database {
    private data;
    private lists;
    private connected;
    connect(): Promise<void>;
    disconnect(): Promise<void>;
    isConnected(): boolean;
    getStoreType(): string;
    get<T>(key: string): Promise<T | undefined>;
    set<T>(key: string, value: T): Promise<void>;
    setIfAbsent<T>(key: string, value: T): Promise<{
        value: T;
        inserted: boolean;
    }>;
    delete(key: string): Promise<void>;
    list(prefix: string): Promise<string[]>;
    append<T>(key: string, item: T): Promise<void>;
    updateList<T, R>(key: string, updater: (items: T[]) => {
        items: T[];
        result: R;
    }): Promise<R>;
    getRange<T>(key: string, start: number, count: number): Promise<T[]>;
    private checkConnection;
    clear(): Promise<void>;
    dump(): Promise<{
        data: Record<string, unknown>;
        lists: Record<string, unknown[]>;
    }>;
}
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