# CallbackOptions

interface

Additional options for registering a callback.

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-utils/src/emittermixin.ts#L660)

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## Properties

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### `priority?: PriorityString` _(readonly)_

The priority of this event callback. The higher the priority value the sooner the callback will be fired. Events having the same priority are called in the order they were added.

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-utils/src/emittermixin.ts#L669)

Defaults to `` `'normal'` ``

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