Describe the bug
When running vitest against a config with multiple vitest projects, filtering out browser projects (with the negation/! operator) does not work. The expected behaviour and current behaviour over various filtering scenarios is laid out in the following table:
| filter |
expected # of tests |
actual # of tests |
result |
| none |
2 |
2 |
🟢 |
--project node |
1 |
1 |
🟢 |
--project browser |
1 |
1 |
🟢 |
--project !node |
1 |
1 |
🟢 |
--project !browser |
1 |
2 |
🔴 |
These are the above results executed on the attached reproduction:
Reproduction
https://github.com/james-camilleri/vitest-project-filtering-reproduction
System Info
System:
OS: Windows 11 10.0.26200
CPU: (16) x64 AMD Ryzen AI 7 PRO 350 w/ Radeon 860M
Memory: 3.13 GB / 23.65 GB
Binaries:
Node: 24.14.1 - C:\Users\JamesCamilleri\scoop\apps\nodejs-lts\current\node.EXE
Yarn: 1.22.22 - C:\Users\JamesCamilleri\scoop\apps\nodejs-lts\current\bin\yarn.CMD
npm: 11.11.0 - C:\Users\JamesCamilleri\scoop\apps\nodejs-lts\current\npm.CMD
pnpm: 10.33.0 - C:\Users\JamesCamilleri\scoop\shims\pnpm.EXE
Deno: 2.7.7 - C:\Users\JamesCamilleri\scoop\shims\deno.EXE
Browsers:
Edge: Chromium (145.0.3800.82)
npmPackages:
@vitest/browser-playwright: ^4.1.2 => 4.1.2
vite: ^8.0.1 => 8.0.3
vitest: ^4.1.2 => 4.1.2Used Package Manager
pnpm
Validations
Describe the bug
When running vitest against a config with multiple vitest projects, filtering out browser projects (with the negation/
!operator) does not work. The expected behaviour and current behaviour over various filtering scenarios is laid out in the following table:--project node--project browser--project !node--project !browserThese are the above results executed on the attached reproduction:
Reproduction
https://github.com/james-camilleri/vitest-project-filtering-reproduction
System Info
System: OS: Windows 11 10.0.26200 CPU: (16) x64 AMD Ryzen AI 7 PRO 350 w/ Radeon 860M Memory: 3.13 GB / 23.65 GB Binaries: Node: 24.14.1 - C:\Users\JamesCamilleri\scoop\apps\nodejs-lts\current\node.EXE Yarn: 1.22.22 - C:\Users\JamesCamilleri\scoop\apps\nodejs-lts\current\bin\yarn.CMD npm: 11.11.0 - C:\Users\JamesCamilleri\scoop\apps\nodejs-lts\current\npm.CMD pnpm: 10.33.0 - C:\Users\JamesCamilleri\scoop\shims\pnpm.EXE Deno: 2.7.7 - C:\Users\JamesCamilleri\scoop\shims\deno.EXE Browsers: Edge: Chromium (145.0.3800.82) npmPackages: @vitest/browser-playwright: ^4.1.2 => 4.1.2 vite: ^8.0.1 => 8.0.3 vitest: ^4.1.2 => 4.1.2Used Package Manager
pnpm
Validations