useFragment accepts a generic type, but it converts it into a DeepPartialObject. what is the best usage in here to avoid using DeepPartialObject?

[paolojulian]

We have just started implementing useFragment. But the problem is we need to add typeguard of use typecast for the DeepPartialObject. useQuery is not doing this.

[jerelmiller]

Hey @paolojulian 👋

This happens because we don't know if the cache can fulfill the entirety of the fragment or not. useFragment will return any data it can, therefore it can be partial. useFragment also returns a complete property that you can use to determine if the cache could fulfill the entire fragment. The types will adjust to the non-partial type if you check for complete first.

const { complete, data } = useFragment<MyFragment>({ fragment })
//                 ^? DeepPartial<MyFragment>

if (complete) {
  data
// ^? MyFragment
}

Hope this helps!

[paolojulian]

@jerelmiller Ahhh, I wonder why I didn't notice it 😅 , i was also looking at the useFragment.d.ts but didn't catch it, thanks for this!

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[jerelmiller]

You're welcome! Glad I could help 🙂

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