How to use the handsontable/helpers/unicode.isKey function in handsontable

value: function onInputKeyDown(event) {
      if (isKey(event.keyCode, 'ENTER')) {
        this.runLocalHooks('accept');
        stopImmediatePropagation(event);
      } else if (isKey(event.keyCode, 'ESCAPE')) {
        this.runLocalHooks('cancel');
        stopImmediatePropagation(event);
      }
    }
  }]);

onInputKeyDown(event) {
    if (isKey(event.keyCode, 'ENTER')) {
      this.runLocalHooks('accept');
      stopImmediatePropagation(event);

    } else if (isKey(event.keyCode, 'ESCAPE')) {
      this.runLocalHooks('cancel');
      stopImmediatePropagation(event);
    }
  }
}

onInputKeyDown(event) {
    if (isKey(event.keyCode, 'ENTER')) {
      this.runLocalHooks('accept');
      stopImmediatePropagation(event);

    } else if (isKey(event.keyCode, 'ESCAPE')) {
      this.runLocalHooks('cancel');
      stopImmediatePropagation(event);
    }
  }
}

value: function onInputKeyDown(event) {
      if (isKey(event.keyCode, 'ENTER')) {
        this.runLocalHooks('accept');
        stopImmediatePropagation(event);
      } else if (isKey(event.keyCode, 'ESCAPE')) {
        this.runLocalHooks('cancel');
        stopImmediatePropagation(event);
      }
    }
  }]);