import { ICompareFn } from '../common';
export declare class PriorityQueue<T> {
    private compareFn;
    private data;
    constructor(compareFn?: ICompareFn<T>);
    constructor(items: T[], compareFn?: ICompareFn<T>);
    private exch;
    private less;
    private swim;
    private sink;
    insert(val: T): void;
    top(): T | null;
    delTop(): T | null;
    size(): number;
    isEmpty(): boolean;
}