Type narrowing is lost when use selectFromResult

[alagunoff]

When I don't use selectFromResult I can, for example, write if (isLoading) and inside if block my data variable won't have undefined type. But when I use selectFromResult this behavior is lost. Maybe I am doing smth incorrectly?

[phryneas]

You are replacing the return type of the RTKQ query hook with your own (in this case implicit) type.
If you want type behaviour like that, you will have to create a type with that behaviour and explicitly return that.

E.g.

type MyType = { isVaultBeingFetched: true, vault: undefined } | { isVaultBeingFetched: false, vault: SomeVaultType }