placeholderData with useQuery returned data property type
I am using placeholderData in my query but the type for data returned seems to have undefined still in it.
I notice when setting initialData it correctly removes the undefined from the type but with placeholderData it doesn't.
I'm guessing this is done for a reason. Can anyone tell me why it could be undefined still with a placeholder set?
1 Reply
like-gold•3y ago
there is no type narrowing for placeholderData. If the query errors out, data will still be undefined. I've written about that here: https://tkdodo.eu/blog/placeholder-and-initial-data-in-react-query