export type Compare<T> = (a: T, b: T) => number;
export declare class MinHeap<T> {
    private heap;
    private compare;
    private itemIndex;
    constructor(compare: Compare<T>);
    insert(value: T): void;
    extractMin(): T | undefined;
    update(value: T): void;
    isEmpty(): boolean;
    private swap;
    private siftUp;
    private siftDown;
}