export type HeapCompareFn<T> = (a: T, b: T) => number;
/**
 * @license MIT
 * @copyright 2024 Thinh Trinh Duc <thinh.duc.trinh@gmail.com>
 *
 * @class
 */
export declare class Heap<T> {
    #private;
    /**
     *
     * @param values New elements to add to the Heap.
     * @param compareFn Function used to determine the order of the elements. It is expected to return a negative value if the first argument is less than the second argument, zero if they're equal, and a positive value otherwise.
     */
    constructor(values?: T[], compareFn?: HeapCompareFn<T>);
    get size(): number;
    get root(): T;
    /**
     *
     * @param values New elements to add to the Heap.
     * @param compareFn Function used to determine the order of the elements. It is expected to return a negative value if the first argument is less than the second argument, zero if they're equal, and a positive value otherwise.
     */
    static fromArray<T>(values?: T[], compareFn?: HeapCompareFn<T>): Heap<T>;
    /**
     * Get left child's index of the provided index.
     * @param i index of the node
     */
    static getLeftChildIndex(i: number): number;
    /**
     * Get right child's index of the provided index.
     * @param i index of the node
     */
    static getRightChildIndex(i: number): number;
    /**
     * Get parent's index of the provided index.
     * @param i index of the node
     */
    static getParentIndex(i: number): number;
    /**
     * Inserts new elements to the Heap.
     * if only single value is add the complexity is log(N)
     * otherwise the complexity is log(N)
     * @param values New elements to add to the Heap.
     */
    insert(...values: T[]): this;
    /**
     * Checks if an array is a valid heap.
     */
    isValid(i?: number): boolean;
    /**
     * Remove the top element of a heap and returns it
     * Return `undefined` if heap is empty.
     */
    extractRoot(): T | undefined;
    toArray(): T[];
}
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