How to use the cx/util.KeyCode.left function in cx

editTask(id);
                    break;

                case KeyCode.up:
                    if (e.ctrlKey) this.moveTaskUp(e, instance);
                    break;

                case KeyCode.down:
                    if (e.ctrlKey) this.moveTaskDown(e, instance);
                    break;

                case KeyCode.right:
                    if (e.ctrlKey) this.moveTaskRight(e, instance);
                    break;

                case KeyCode.left:
                    if (e.ctrlKey) this.moveTaskLeft(e, instance);
                    break;
            }
        },

onTaskListKeyDown(e, instance) {
            let code = c => c.charCodeAt(0),
                list;

            switch (e.keyCode) {
                case code("K"):
                    if (e.currentTarget.previousSibling)
                        FocusManager.focusFirst(e.currentTarget.previousSibling);
                    break;

                case code("J"):
                    if (e.currentTarget.nextSibling)
                        FocusManager.focusFirst(e.currentTarget.nextSibling);
                    break;

                case KeyCode.left:
                case code("H"):
                    list = closest(e.target, el => el.classList.contains("cxb-tasklist"));
                    if (list.previousSibling) FocusManager.focusFirst(list.previousSibling);
                    break;

                case KeyCode.right:
                case code("L"):
                    list = closest(e.target, el => el.classList.contains("cxb-tasklist"));
                    if (list.nextSibling) FocusManager.focusFirst(list.nextSibling);
                    break;
            }
        },