# CollectionChangeEventData

typedef

A structure describing the [`Collection#change`](module_utils_collection-Collection.md#event-change) event.

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-utils/src/collection.ts#L793)

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## Type parameters

### `T: any`

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## Properties

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### `added: Iterable<T>`

A list of added items.

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### `index: number`

An index where the addition or removal occurred.

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### `removed: Iterable<T>`

A list of removed items.

#### Value

`object`

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