Coverage Check

Context

Run in parallel:

• •git diff --name-only - get unstaged files
• •git diff -U0 --no-color - get changed line numbers

Commands

Sequential:

1. •npm run test:ci - vitest with coverage
2. •npm run coverage:report - generate lcov/text reports

Workflow

1. •Get unstaged files and line ranges (parallel):
   • •git diff --name-only
   • •git diff -U0 --no-color
2. •Run coverage:
   • •npm run test:ci
   • •npm run coverage:report
3. •Parse coverage/lcov.info:
   • •Find changed files (SF: lines)
   • •Extract line coverage (DA: lines)
   • •DA format: DA:line_number,hit_count (0=uncovered)
4. •Map changed lines to coverage:
   • •Match file paths
   • •Check hit count for changed line numbers
   • •Collect uncovered lines
5. •Report:
   • •File:line_number for uncovered changes
   • •Summary: X/Y changed lines covered

lcov Format

Parse coverage/lcov.info:

SF:src/utils/helper.ts
DA:10,1    # line 10, covered (hit 1 time)
DA:11,0    # line 11, NOT covered
DA:12,5    # line 12, covered (hit 5 times)
end_of_record
SF:src/another.ts
...

Key:

• •SF: - source file path
• •DA:line,hits - line coverage (0 = uncovered)
• •Match SF paths to git diff file paths

Rules

• •Only analyze unstaged changes (git diff)
• •Use sequential commands: test:ci then coverage:report
• •Parse lcov.info for coverage data
• •Report uncovered lines: file.ts:42
• •Ignore files without coverage data (non-code files)