/**
 * Build a merkle tree from leaves
 *
 * ```
 *      0
 *    /   \
 *   1     2
 *  / \   / \
 * 3   4 5   6
 * ```
 *
 * @param leaves - Leaf data to build tree from
 * @returns Root of the merkle tree
 */
export declare function buildMerkleTree(leaves: Uint8Array[]): Uint8Array[];