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DeepPartial support in vi.mocked #8152
Description
Clear and concise description of the problem
The vi.mocked type helper currently only supports partials at the surface level. If the return type of a function contains nested objects, there's no way to do a deep/recursive partial. This can require mocking a lot of unnecessary fields.
Particularly with APIs that return a tuple of a success object and an error (eg: [data, err]). The partial flag doesn't really do anything here, data must still be fully mocked to pass the type checks.
Suggested solution
I would be happy to send in a PR to add support for a DeepPartial. I would be looking for some guidance on what the ideal API for that would be in the options object of vi.mocked. I had originally expected setting { partial: true, deep: true } to do what I'm describing, so it's going to be tricky to add a flag that's clear in what it does and what separates it from the existing flags.
Alternative
No response
Additional context
No response
Validations
- Follow our Code of Conduct
- Read the Contributing Guidelines.
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- Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
Activity
sheremet-va commentedon Dec 22, 2025
Feel free to open a PR with a fix. I think
partial: true, deep: trueshould support that.feat(spy): support deep partial in vi.mocked (vitest-dev#8152)
docs(vi): add deep partial example for vi.mocked (vitest-dev#8152)
fix(spy): support deep partial in vi.mocked (#8152) (#9493)