Pre-Commit Checks Skill

Comprehensive validation before committing code.

When to Use

• Before any git commit
• When user runs /pre-commit
• As part of quick-commit workflow

Steps

1. Check for unstaged changes

   git status --short
   

   Warn if there are unstaged changes that won't be committed.

2. Type Check (TypeScript)

   npx tsc --noEmit
   

   STOP if type errors found.

3. Lint Check

   npm run lint
   

   STOP if lint errors found (warnings OK).

4. Format Check

   npx prettier --check .
   

   Offer to fix if formatting issues found.

5. Run Tests

   npm test
   

   STOP if tests fail.

6. Check for Sensitive Files Scan staged files for:

   • .env files (should be .env.example only)
   • Credentials, API keys, secrets
   • Large binary files WARN if found.

7. Verify Git Identity

   git config user.email
   

   Confirm correct email for this project.

Output

All Checks Pass

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
PRE-COMMIT CHECK

[OK] TypeScript: No errors
[OK] ESLint: Passed
[OK] Prettier: Formatted
[OK] Tests: All passing
[OK] No sensitive files
[OK] Git identity: your.email@example.com

Ready to commit!
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Checks Failed

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
PRE-COMMIT CHECK

[OK] TypeScript: No errors
[FAIL] ESLint: 3 errors found
  - src/index.ts:15 - Unexpected any
  - src/utils.ts:8 - Missing return type
  - src/utils.ts:12 - Unused variable
[--] Prettier: Skipped (lint failed)
[--] Tests: Skipped (lint failed)

Fix errors before committing.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Auto-Fix Mode

When invoked with "fix" argument:

1. Run lint:fix
2. Run prettier --write
3. Re-run all checks
4. Report final status