export declare class BinaryHeap<T> {
    private compare;
    private items;
    constructor(compare: (a: T, b: T) => number);
    get size(): number;
    peek(): T | undefined;
    push(item: T): void;
    pop(): T | undefined;
    values(): T[];
    private bubbleUp;
    private bubbleDown;
    private swap;
}