# NotificationShowWarningEvent

typedef

Fired when the `showWarning()` method is called.

When this event is not handled or stopped by `event.stop()`, the `data.message` of this event will be automatically displayed as a system alert.

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-ui/src/notification/notification.ts#L256)

#### Value

`NotificationShowTypeEvent<'warning'>`

## Fired by

* [Notification#show:warning](module_ui_notification_notification-Notification.md#event-show:warning)

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Full index of the CKEditor 5 API reference: [llms.txt](llms.txt)