Vitest

Vitest has a sort-of builtin report. Just run vitest --reporter html via the CLI, or see vitest docs. You may be prompted to install the @vitest/ui package. Then just upload the artifact:

- run: npx vitest --reporter html
- uses: actions/upload-artifact@v4
  if: always()
  with:
    name: vitest
    path: vitest-report

Coverage

Vitest has a built-in coverage reporter which outputs HTML — if you’re paying for codecov… maybe you don’t need to anymore. Just run vitest --coverage via the CLI, or see vitest docs. Then upload the artifact:

- run: npx vitest --coverage
- uses: actions/upload-artifact@v4
  if: always()
  with:
    name: vitest
    path: coverage

Or you can combine the HTML output with the coverage report:

- run: npx vitest --coverage --reporter html
- uses: actions/upload-artifact@v4
  if: always()
  with:
    name: vitest
    path: |
      coverage
      html

Note that by default, the coverage report will be skipped if any tests fail. You can override this by passing --coverage.reportOnFailure.