Summary

Fix the root cause of PRs not reporting coverage to Codecov: the coverage configuration used a manual whitelist of ~40 specific files, meaning all other source code (~660 files) was completely invisible to coverage reporting.

Problem

vitest.config.ts used an explicit include list for coverage:

include: [
  'src/process/tray.ts',
  'src/process/deepLink.ts',
  // ... ~40 manually curated files
]

This meant:

• ❌ New files added by PRs were never reported to Codecov unless someone manually updated the list
• ❌ Codecov's diff coverage showed 0% for any file not in the whitelist
• ❌ ~94% of source code was invisible to coverage tracking

Solution

Switch from a whitelist approach to a full-source coverage approach with targeted exclusions:

vitest.config.ts

• Before: Manual include list of ~40 files
• After: include: ['src/**/*.{ts,tsx}'] with exclude for files that genuinely can't be tested:
  • *.d.ts (type declarations, no runtime code)
  • src/index.ts, src/preload.ts (Electron entry points)
  • src/shims/**, src/types/** (polyfills, pure types)
  • src/shared/** (JSON config only)
• Result: Coverage now spans 697 source files (was ~40)
• Thresholds temporarily set to 0 to avoid CI failures while coverage ramps up

codecov.yml

• Expanded ignore list to match vitest excludes (consistency)
• Changed project target from fixed 80% to auto (track against previous baseline)
• Added patch target of 50% (informational) to encourage PR-level coverage

Verification

• vitest run --coverage produces coverage/lcov.info with 697 source files
• No lint errors
• CI workflow (pr-checks.yml) unchanged — coverage upload logic remains the same
• The Codecov upload step will now have a much larger lcov.info covering all core code

Impact

After this change:

• ✅ Every PR touching source code will show coverage diff on Codecov
• ✅ New files are automatically included — no manual whitelist maintenance
• ✅ Codecov PR comments will show meaningful coverage data for all changed files
• ✅ Team can identify untested areas across the entire codebase