# DowncastMarkerDataCreatorFunction

typedef

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-engine/src/conversion/downcasthelpers.ts#L3148)

#### Parameters

* `markerName: string`
* `conversionApi: DowncastConversionApi`

#### Returns

* `object | null`

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