feat(query-core): make MutateFunction optional undefinable-variables - #8737
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| mutate() // can be called with no arguments |
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that’s a good improvement 👍 . I’m missing a test for the use-case where we have a mutation function that doesn’t take anything in, so the variables are void.
Also, I’d prefer if we create the mutation functions not via type assertions, but by whatever a MutationObserver returns. Something like:
const { mutate } = new MutationObserver(new QueryClient(), {
mutationFn: async (_vars: number | undefined) => {
return null
},
})
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I've added the void case as requested. However, I couldn’t create a test using MutationObserver because the mutate function is implemented as a standalone function rather than using MutateFunction. As a result, the changes don’t impact its behavior. Let me know if you have any suggestions on how to approach testing this scenario.
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oh interesting. question is if it would also work with the mutate function returned from useMutation, as that is what most users will use. The type is defined here:
query/packages/react-query/src/types.ts
Lines 197 to 204 in 3e3fba9
would be great to have a test in useMutation.test-d.tsx in the react-query adapter for this then 🙏
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I've already covered this case. Please check my tests.
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I've already covered this case
yeah that’s okay for the query-core, but it doesn’t actually test what useMutation in react-query does. It’s great that we cover the functionality that we have in useMutation now, but if we refactor that, it won’t be covered by the test in the core.
That’s why each adapter should have its own tests for the types they are doing. But we can do this in a follow-up.
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there are type errors now in other adapters |
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ChangesMutation argument typing
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change broadens when mutation variables may be omitted for undefined-capable types, with no actionable merge-blocking risk remaining after normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@packages/query-core/src/__tests__/mutations.test-d.tsx`:
- Around line 24-47: Add type-level coverage in the mutations tests for
MutateFunction variables typed as unknown, any, and void unions, including both
direct calls and spread-argument forms. Assert the parameter and options types
and preserve the intended behavior when undefined extends TVariables, alongside
the existing optional undefinable variables case.
In `@packages/query-core/src/types.ts`:
- Around line 1179-1200: Update the Vue adapter’s mutate wrapper signature to
use the shared MutateFunction or MutateFunctionRest type, preserving optional
zero-argument calls when TVariables includes undefined. Locate the wrapper by
its mutate implementation and keep its existing behavior unchanged.
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Old Behavior:
.mutate,.mutateAsync, ... allowed omitting thevariablesparameter only when its type was exactlyvoid.However, in TypeScript, when using union types like
unknown | void, thevoidportion is ignored and treated asunknown, which still requires thatvariablesbe provided.New Behavior:
.mutate,.mutateAsync, ... now allow omitting thevariablesparameter when its type can beundefined.This change significantly broadens the optional types, supporting cases such as
unknown,any,undefined | ...,void | ..., ...Another benefit of the new approach is that, for popular schema libraries like Zod and Valibot, it is easier to define an undefinable schema than a void-able one.
Summary by CodeRabbit
Bug Fixes
Tests