export declare type NodeMap<T> = Record<string, T>;
export interface Node<T> {
    key: string;
    next: Node<T> | null;
    previous: Node<T> | null;
    value: T;
}
export declare class LRUCache<T> {
    readonly capacity: number;
    private map;
    private head;
    private end;
    constructor(capacity?: number);
    delete(key: string): boolean;
    deleteAll(): void;
    get(key: string): T | undefined;
    getAll(): NodeMap<T>;
    keys(): string[];
    latest(): T | null;
    oldest(): T | null;
    private remove;
    set(key: string, value: T): T | undefined;
    setOnce(key: string, value: T): T | undefined;
    private setHead;
    size(): number;
    toString(): string;
    [Symbol.iterator](): Iterator<T>;
}