import { SizedMap } from './SizedMap';
export declare class LfuMap<K, V> extends SizedMap<K, V> {
    private queue;
    private frequencies;
    private leastFrequent;
    has(key: K): boolean;
    get(key: K, _default?: V): V | undefined;
    set(key: K, value: V): this;
    delete(key: K): boolean;
    clear(): void;
    private initQueue;
    private queuePop;
    private moveToTop;
    private removeNode;
    private increaseFrequency;
    private decreaseFrequency;
}