Text reporter still creates an empty coverage folder

[xixixao]

Describe the bug

Run

npx vitest run --coverage --coverage.reporter=text

You will get an empty coverage folder

Reproduction

1. Use the default playground: https://stackblitz.com/fork/github/vitest-dev/vitest/tree/main/examples/basic?initialPath=__vitest__/
2. Quit the watcher
3. Run the command
4. Observer the folder

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 18.18.0 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.3 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @vitest/coverage-v8: ^1.6.0 => 1.6.0 
    @vitest/ui: latest => 1.6.0 
    vite: latest => 5.2.11 
    vitest: latest => 1.6.0 

(it reproes on my mac too)

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[AriPerkkio]

During test run Vitest needs to create coverage/.tmp where raw coverage results from tests are stored. After the coverage report has been generated it removes the .tmp directory.

I think we could check if coverage directory is completely empty after that, and then delete that one as well.

[xixixao]

That's a good solution. It might be even better to store the .tmp in node_modules so the coverage folder doesn't pop into and out of existence in people's editors.

[AriPerkkio]

I think we would like to keep these results close to coverage report directory so using node_modules by default might not work.

Though that's already possible from userland with npx vitest run --coverage --coverage.reporter=text --coverage.reportsDirectory=node_modules/.vitest-coverage for example.