/// <reference types="node" />
export declare const EMPTY_MERKLE_ROOT = "0x0000000000000000000000000000000000000000000000000000000000000000";
export declare class MerkleTree<T> {
    readonly hashFn: (element: T) => string;
    private readonly elements;
    private readonly bufferElementPositionIndex;
    private readonly layers;
    constructor(leaves: T[], hashFn: (element: T) => string);
    isEmpty(): boolean;
    getLayers(elements: Buffer[]): Buffer[][];
    getNextLayer(elements: Buffer[]): Buffer[];
    static combinedHash(first: Buffer, second: Buffer): Buffer;
    getRoot(): Buffer;
    getHexRoot(): string;
    getProof(leaf: T): Buffer[];
    getHexProof(leaf: T): string[];
    leafToBuf(element: T): Buffer;
    getProofRawBuf(element: Buffer): Buffer[];
    getHexProofRawBuf(el: Buffer): string[];
    private static getPairElement;
    private static bufDedup;
    private static bufArrToHexArr;
    private static sortAndConcat;
}