code: function ($arg, $opt) {
    var lastEnter = 0
    var lastExit = 0
    updateLifeCycle(function () {
      if (isDefine($opt) && isObject($opt) && isString($arg)) {
        if (countEntered > lastEnter) {
          isDefine($opt.enter) && hasAtt(createEl.enter, $arg) && $opt.enter(createEl.enter)
          lastEnter = countEntered
        }
        if (countExits > lastExit) {
          isDefine($opt.exit) && hasAtt(createEl.exit,$arg) && $opt.exit(createEl.exit)
          lastExit = countExits
        }
      }
    })
  }
docs: ($arg → string, $opt → object{ * })
  - check and send notification if component has enter or exit