How to use the circomlib.mimcsponge function in circomlib

*/

const crypto = require('crypto');
const path = require('path');
const {unstringifyBigInts, stringifyBigInts} = require('websnark/tools/stringifybigint.js');

const chai = require('chai');
const assert = chai.assert;

const snarkjs = require('snarkjs');
const circomlib = require('circomlib');

const bigInt = snarkjs.bigInt;

const eddsa = circomlib.eddsa;
const mimcsponge = circomlib.mimcsponge;

const proof_util = require('../util');

const fetch = require('node-fetch');

const Web3 = require('web3');

const ethers = require('ethers');

let logger;

/* uint8array to hex */

function hex(byteArray) {
  return Array.prototype.map.call(byteArray, function(byte) {
    return ('0' + (byte & 0xFF).toString(16)).slice(-2);

* semaphorejs is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with semaphorejs.  If not, see .
 */

const chai = require('chai');
const snarkjs = require('snarkjs');
const circomlib = require('circomlib');

const bigInt = snarkjs.bigInt;

const mimcsponge = circomlib.mimcsponge;

let build_merkle_tree_example = (n_levels, identity_commitment) => {
    let current_index = 0;
    let path_index = [];
    let path_elements = [];
    let current_element = identity_commitment;
    for (let i = 0; i < n_levels; i++) {
      path_elements.push(bigInt(0));
      current_element = mimcsponge.multiHash([ bigInt(current_element), bigInt(0) ]);

      path_index.push(current_index % 2);
      current_index = Math.floor(current_index / 2);
    }

    const root = current_element;

const circomlib = require('circomlib')
const mimcsponge = circomlib.mimcsponge
const snarkjs = require('snarkjs')

const bigInt = snarkjs.bigInt

class MimcSpongeHasher {
  hash(level, left, right) {
    return mimcsponge.multiHash([bigInt(left), bigInt(right)]).toString()
  }
}

module.exports = MimcSpongeHasher