import type { ExtendedStore } from './type.js';
export declare class KeyValueInMemoryFile<K extends string, V> implements ExtendedStore<K, V> {
    #private;
    private readonly filepath;
    get ttlSupport(): boolean;
    constructor(filepath: string);
    keys(): readonly K[];
    get(key: K): V | undefined;
    set(key: K, value: V): Promise<void>;
    delete(key: K): Promise<boolean>;
    clear(): void;
}