Degradation: Significant slow down of C8 coverage report

[gkiely]

Describe the bug

0.22.0 Introduces a significant slowdown of C8 coverage.

Reproduction

Repo: https://github.com/gkiely/vite-react-starter

git clone git@github.com:gkiely/vite-react-starter.git
npm run test-all # Runs fast as it's using 0.17.1, 0.21.1 also runs fast
# Update package json to "vitest": "0.22.0",
npm run test-all

System Info

System:
    OS: macOS 12.2.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 4.53 GB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 18.4.0 - ~/.volta/tools/image/node/18.4.0/bin/node
    Yarn: 1.22.18 - ~/.volta/tools/image/yarn/1.22.18/bin/yarn
    npm: 8.12.1 - ~/.volta/tools/image/node/18.4.0/bin/npm
    Watchman: 2022.03.21.00 - /opt/homebrew/bin/watchman
  Browsers:
    Chrome: 105.0.5195.102
    Firefox: 103.0.2
    Safari: 15.3
  npmPackages:
    @vitejs/plugin-react: ^2.0.1 => 2.0.1 
    vite: ^3.0.9 => 3.0.9 
    vitest: 0.22.0 => 0.22.0

Used Package Manager

npm

Validations

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• Read the Contributing Guidelines.
• Read the docs.
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• The provided reproduction is a minimal reproducible example of the bug.

[Demivan]

Duplicate of #1917?

[gkiely]

Fixed with latest version.