declare type CompareMethod = 'isLessThan' | 'isGreaterThan';
export declare class Heap<T = any> {
    private heap;
    private readonly comparator;
    private readonly method;
    constructor(method: CompareMethod, compareFn?: (a: T, b: T) => number);
    get size(): number;
    build(array: T[]): void;
    insert(value: T): T;
    peek(): T | undefined;
    toArray(): T[];
    extract(): T | undefined;
    private siftDown;
    private siftUp;
    private swap;
    private getChildIndex;
    private getParentIndex;
}
export {};