How to use the yjs.utils function in yjs

async function createUsers (numberOfUsers) {
  if (Y.utils.globalRoom.users[0] != null) {
    await Y.utils.globalRoom.flushAll()
  }
  // destroy old users
  for (var u in Y.utils.globalRoom.users) {
    Y.utils.globalRoom.users[u].y.destroy()
  }
  var promises = []
  for (var i = 0; i < numberOfUsers; i++) {
    promises.push(Y({
      db: {
        name: 'memory',
        namespace: 'User ' + i,
        // cleanStart: true,
        gcTimeout: -1
      },
      connector: {
        name: 'Test',
        debug: false
      },
      share: {
        root: 'Map'

this.role = opts.role
    this.connections = {}
    this.isSynced = false
    this.userEventListeners = []
    this.whenSyncedListeners = []
    this.currentSyncTarget = null
    this.syncingClients = []
    this.forwardToSyncingClients = opts.forwardToSyncingClients !== false
    this.debug = opts.debug === true
    this.syncStep2 = Promise.resolve()
    this.broadcastOpBuffer = []
    this.protocolVersion = 11
    this.authInfo = opts.auth || null
    this.checkAuth = opts.checkAuth || function () { return Promise.resolve('write') } // default is everyone has write access
    if (opts.generateUserId === true) {
      this.setUserId(Y.utils.generateGuid())
    }
  }
  resetAuth (auth) {

async function createUsers (numberOfUsers) {
  if (Y.utils.globalRoom.users[0] != null) {
    await Y.utils.globalRoom.flushAll()
  }
  // destroy old users
  for (var u in Y.utils.globalRoom.users) {
    Y.utils.globalRoom.users[u].y.destroy()
  }
  var promises = []
  for (var i = 0; i < numberOfUsers; i++) {
    promises.push(Y({
      db: {
        name: 'memory',
        namespace: 'User ' + i,
        // cleanStart: true,
        gcTimeout: -1
      },
      connector: {