Vitest v2 coverage is reporting 'Unexpected reserved word' error

[meteorlxy]

Describe the bug

• vitest run works well
• vitest run --coverage fails

Reproduction

Repository: https://github.com/mdit-vue/mdit-vue
CI log: https://github.com/mdit-vue/mdit-vue/actions/runs/9992201242/job/27616645356

System Info

System:
    OS: macOS 14.4
    CPU: (10) arm64 Apple M1 Pro
    Memory: 334.61 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.12.2 - ~/Library/Caches/fnm_multishells/77642_1721308212385/bin/node
    npm: 10.5.0 - ~/Library/Caches/fnm_multishells/77642_1721308212385/bin/npm
    pnpm: 9.5.0 - ~/Library/Caches/fnm_multishells/77642_1721308212385/bin/pnpm
    Watchman: 2024.05.06.00 - /opt/homebrew/bin/watchman
  Browsers:
    Chrome: 126.0.6478.182
    Safari: 17.4
  npmPackages:
    @vitest/coverage-istanbul: ^2.0.3 => 2.0.3 
    vitest: ^2.0.3 => 2.0.3

Used Package Manager

pnpm

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]

Renaming the index.d.cts to *.d.mts or *.d.ts seems to fix the issue 🤔

[AriPerkkio]

Need to check if Vite transforms *.cts as Typescript files. Or if Vite supports *.cts at all as it's not ESM.

[sheremet-va]

Need to check if Vite transforms *.cts as Typescript files. Or if Vite supports *.cts at all as it's not ESM.

Vite doesn't support transforming cts files: #3987

[AriPerkkio]

As fix let's exclude *.cts from coverage completely.