How to use the handsontable/helpers/function.partial function in handsontable

value: function onItemsBoxBeforeKeyDown(event) {
      var isKeyCode = partial(isKey, event.keyCode);

      if (isKeyCode('ESCAPE')) {
        this.runLocalHooks('keydown', event, this);
      }
      // for keys different than below, unfocus Handsontable and focus search input
      if (!isKeyCode('ARROW_UP|ARROW_DOWN|ARROW_LEFT|ARROW_RIGHT|TAB|SPACE|ENTER')) {
        stopImmediatePropagation(event);
        this.itemsBox.unlisten();
        this.itemsBox.deselectCell();
        this.searchInput.focus();
      }
    }

onItemsBoxBeforeKeyDown(event) {
    const isKeyCode = partial(isKey, event.keyCode);

    if (isKeyCode('ESCAPE')) {
      this.runLocalHooks('keydown', event, this);
    }
    // for keys different than below, unfocus Handsontable and focus search input
    if (!isKeyCode('ARROW_UP|ARROW_DOWN|ARROW_LEFT|ARROW_RIGHT|TAB|SPACE|ENTER')) {
      stopImmediatePropagation(event);
      this.itemsBox.unlisten();
      this.itemsBox.deselectCell();
      this.searchInput.focus();
    }
  }

value: function onInputKeyDown(event) {
      this.runLocalHooks('keydown', event, this);

      var isKeyCode = partial(isKey, event.keyCode);

      if (isKeyCode('ARROW_DOWN|TAB') && !this.itemsBox.isListening()) {
        stopImmediatePropagation(event);
        this.itemsBox.listen();
        this.itemsBox.selectCell(0, 0);
      }
    }

onInputKeyDown(event) {
    this.runLocalHooks('keydown', event, this);

    const isKeyCode = partial(isKey, event.keyCode);

    if (isKeyCode('ARROW_DOWN|TAB') && !this.itemsBox.isListening()) {
      stopImmediatePropagation(event);
      this.itemsBox.listen();
      this.itemsBox.selectCell(0, 0);
    }
  }