How to assert NonNullable data on UseQuery

I have a custom hook with infinite query. I check for undefined at the app first render and then it is reused so I know by then, the type should not be undefined. I would like to be able to infer its type without undefined conditionally. Can I do that? How to if so??

export const useAppContext = (enabled = true) =>
  api.appContext.getAppContext.useQuery(undefined, {
    staleTime: Infinity,
    enabled,
    select: (data) => {
      currentRoles = data?.authorisation?.roles ?? []
      return data
    },
  })

export const useAppContext = (enabled = true) =>
  api.appContext.getAppContext.useQuery(undefined, {
    staleTime: Infinity,
    enabled,
    select: (data) => {
      currentRoles = data?.authorisation?.roles ?? []
      return data
    },
  })

the type of data will be in this case always the TYPE | undefined.

const { data } = useAppContext()

const { data } = useAppContext()

I would like it to be:

1st time (app top level) of type -> TYPE | undefined
and then force it to be just -> TYPE so I dont have to do checking for undefined or mark chaining of data property with ! as I know at this time it's already in the cache and exists

TanStack•3y ago•

1 reply

dead-brown

How to assert NonNullable data on UseQuery

export const useAppContext = (enabled = true) =>
  api.appContext.getAppContext.useQuery(undefined, {
    staleTime: Infinity,
    enabled,
    select: (data) => {
      currentRoles = data?.authorisation?.roles ?? []
      return data
    },
  })

export const useAppContext = (enabled = true) =>
  api.appContext.getAppContext.useQuery(undefined, {
    staleTime: Infinity,
    enabled,
    select: (data) => {
      currentRoles = data?.authorisation?.roles ?? []
      return data
    },
  })

the type of data will be in this case always the TYPE | undefined.

const { data } = useAppContext()

const { data } = useAppContext()

How to assert NonNullable data on UseQuery

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