The documentation [here](https://developer.adobe.com/commerce/services/shared-services/storefront-events/sdk/publish/#msepublishrecsitemclick) displays this as the correct approach. The example given in this repo is mse.publish.recsItemClick({unitId}). 
The documentation here displays this as the correct approach.
The example given in this repo is mse.publish.recsItemClick({unitId}).