import type Keyv from 'keyv';
import type KeyvFile from './index';
export declare class Field<T, D extends T | void = T | void> {
    protected kv: KeyvFile | Keyv | Map<string, any>;
    protected key: string;
    protected defaults: D;
    constructor(kv: KeyvFile | Keyv | Map<string, any>, key: string, defaults: D);
    get(): Promise<D>;
    get(def: D): Promise<D>;
    getSync(): D;
    getSync(def: D): D;
    /**
     * Note: `await kv.someFiled.set()` will wait <options.writeDelay> millseconds to save to disk, it would be slow. Please remove `await` if you find performance issues.
     * @param value
     * @param ttl
     * @returns
     */
    set(val: T, ttl?: number): Promise<any> | Map<string, any>;
    delete(): boolean | Promise<boolean>;
}
export declare function makeField<T = any, D = T>(kv: KeyvFile | Keyv | Map<string, any>, key: string, defaults: T): Field<T, T>;