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fix(types): useSuspenseQuery should type-narrow the Error field #9105

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Merged
merged 6 commits into from
May 6, 2025
Merged

fix(types): useSuspenseQuery should type-narrow the Error field #9105

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c0bda60
fix(types): useSuspenseQuery should type-narrow the Error field
TkDodo May 5, 2025
70e3f17
Update packages/query-core/src/types.ts
TkDodo May 5, 2025
6b8cf8e
Update packages/query-core/src/types.ts
TkDodo May 6, 2025
961e4e8
ref: use DistributiveOmit from query-core in vue-query
TkDodo May 6, 2025
5cd8471
Merge branch 'main' into feature/type-narrow-error
TkDodo May 6, 2025
0273210
chore: fix type error in tests
TkDodo May 6, 2025
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4 changes: 4 additions & 0 deletions packages/query-core/src/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,10 @@ import type { QueryFilters, QueryTypeFilter, SkipToken } from './utils'
import type { QueryCache } from './queryCache'
import type { MutationCache } from './mutationCache'

export type DistributiveOmit<TObject, TKey> = TObject extends any
? Pick<TObject, Exclude<keyof TObject, TKey>>
: never

export type OmitKeyof<
TObject,
TKey extends TStrictly extends 'safely'
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11 changes: 11 additions & 0 deletions packages/react-query/src/__tests__/useSuspenseQuery.test-d.tsx
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Expand Up @@ -68,4 +68,15 @@ describe('useSuspenseQuery', () => {
// @ts-expect-error TS2339
query.isPlaceholderData
})

it('should type-narrow the error field', () => {
const query = useSuspenseQuery({
queryKey: ['key'],
queryFn: () => Promise.resolve(5),
})

if (query.status === 'error') {
expectTypeOf(query.error).toEqualTypeOf<Error>()
}
})
})
3 changes: 2 additions & 1 deletion packages/react-query/src/types.ts
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Expand Up @@ -4,6 +4,7 @@ import type {
DefaultError,
DefinedInfiniteQueryObserverResult,
DefinedQueryObserverResult,
DistributiveOmit,
InfiniteQueryObserverOptions,
InfiniteQueryObserverResult,
MutateFunction,
Expand Down Expand Up @@ -155,7 +156,7 @@ export type UseQueryResult<
export type UseSuspenseQueryResult<
TData = unknown,
TError = DefaultError,
> = OmitKeyof<
> = DistributiveOmit<
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@TkDodo TkDodo May 5, 2025

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@manudeli I think your OmitKeyof helper doesn’t work over union types (just like the build-in Omit also doesn’t work with it).

Because DefinedQueryObserverResult is a union of:

| QueryObserverRefetchErrorResult<TData, TError>
| QueryObserverSuccessResult<TData, TError>

it “doesn’t work” in a sense that type narrowing to error doesn’t happen anymore because it’s not distributive.

I’ve added the standard DistributiveOmit helper and things work fine, but if you can improve your helper type to not fail the added test case, we can switch back.

DefinedQueryObserverResult<TData, TError>,
'isPlaceholderData' | 'promise'
>
Expand Down
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