Support Vitest projects configuration for dynamic project discovery

[yyxi]

Summary

Adds support for Vitest's projects configuration that allows defining test projects through inline configurations and external file patterns. External project files are resolved from glob patterns and their dependencies are correctly assigned to their respective workspace locations.

Resolves #1114

Changes

• Added projects field to VitestConfig interface supporting both inline configs and glob patterns
• Implemented dynamic glob resolution for external project files using _glob utility
• External project configurations loaded using toConfig() for proper workspace assignment
• Created test fixture with both inline and external project configurations
• Dependencies from external projects are correctly attributed to their respective config files

Test plan

• All existing tests pass
• New vitest9 test verifies both inline and external project dependency detection
• External project configs loaded via glob patterns work correctly
• Backward compatibility maintained for workspace configuration
• No regressions introduced

[yyxi]

@webpro ready for review

[webpro]

Thanks! Happy to merge, but I do have a few remarks.

[yyxi]

External project configurations now use toConfig()

• Replaced _load() with toConfig() for external project files in vitest plugin
• Dependencies are now correctly assigned to the workspace where the config file is located
• The resolveConfig function is re-executed with each external config file

Test fixtures simplified and made more realistic

• Disabled vitest coverage to reduce fixture complexity
• Test now verifies proper workspace assignment of dependencies

[webpro]

Great, happy to see this working. Almost there :)

[webpro]

Looks like we can skip creating externalProjectFiles and add this to inputs directly above:

inputs.add(toConfig('vitest', projectFile, { containingFilePath: options.configFilePath }));

These items are added as entry files automatically (i.e. toEntry is redundant).

[yyxi]

This works?

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/knip@1171

commit: 6181b91

[webpro]

Please see CI for remaining issue: https://github.com/webpro-nl/knip/actions/runs/16342525311. You can run bun format to apply the configured formatting.

[yyxi]

fixed the formatting

[webpro]

Thank you very much! Let's go 🚀

[webpro]

🚀 This pull request is included in v5.62.0. See Release 5.62.0 for release notes.

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