Support .config/ dir

[pi0]

Clear and concise description of the problem

Due to a lack of standards for where tools store their configuration, the number of top-level configuration files in projects is increasing day by day. See .config dir proposal for more context.

Suggested solution

I propose supporting .config/vitest.js and .config/vitest.config.js as alternative places to check and load vite configuration if top-level vitest.config.ts does not exist to unblock adopting this new convention across the ecosystem.

Is it too early? While it can take a while to onboard more tools with this new convention, it will be an egg-and-chicken problem to adopt a new convention like this unless more mainstream tools onboard to support it.

Implementation

It seems we can easily append .config/ variants to CONFIG_NAMES and WORKSPACE_NAMES arrays.

Alternative

See relevant discussions.

Additional context

(parent issue in vite: vitejs/vite#15911)

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[AriPerkkio]

Should this be applied to vitest.workspace.ts and its other formats too?