quality-gate

name	quality-gate
description	Universal pre-commit quality checks (typecheck, lint, test, coverage, dead code) with auto-detection and --fix support
allowed-tools	Read, Write, Edit, Bash, Glob, Grep

/quality-gate - Pre-Commit Quality Checks

Run universal quality checks (typecheck, lint, test, coverage) before committing. Auto-detects project type and available tools.

Arguments: Optional flags: --fix (auto-fix lint issues), --coverage-min=80 (coverage threshold percentage), --deadcode (run dead code detection)

Quality Gate Process

DETECT → CHECK → REPORT → BLOCK or APPROVE

1. DETECT: Auto-identify project type and available tools
2. CHECK: Run applicable typecheck, lint, test, and coverage checks
3. REPORT: Display pass/fail per check with summary
4. BLOCK/APPROVE: Block commit if any check fails; suggest fixes

---

Process

Step 1: Project Type Detection

Auto-detect the project type by checking for manifest files in priority order:

Detection Priority (check in this order):

1. package.json → Node.js project (npm, bun, yarn, pnpm)
2. pyproject.toml or requirements.txt → Python project
3. go.mod → Go project
4. Cargo.toml → Rust project

If multiple detected: Run checks for ALL project types (e.g., monorepo with Node + Python)

If none detected: Stop and ask the user which project type to use.

Report detected project type(s) before proceeding.

Step 2: Determine Available Tools

For each detected project type, identify which tools are available:

Node.js Project

Check	Tools to Try (in priority order)	Fallback
Typecheck	bun check, tsc (if tsconfig.json exists)	Skip if no tools available
Lint	bun lint (if oxlint available), eslint, oxlint, biome lint	Skip if no tools available
Test	bun test, npm test, pnpm test, yarn test	Skip if no test script
Coverage	bun test --coverage, npm test -- --coverage, Vitest coverage	Skip if no coverage tool

Custom scripts in package.json: Prefer these over direct tool invocations:

• If package.json has "typecheck" script → use npm run typecheck (or bun/pnpm/yarn equivalent)
• If package.json has "check" script → use npm run check
• If package.json has "lint" script → use npm run lint
• If package.json has "test" script → use npm test

Python Project

Check	Tools to Try (in priority order)	Fallback
Typecheck	mypy, pyright	Skip if not installed
Lint	ruff check, flake8	Skip if not installed
Test	pytest	Skip if not installed
Coverage	pytest --cov	Skip if pytest-cov not installed

Directory to scan: src/ if exists, else ./

Go Project

Check	Tools to Try (in priority order)	Fallback
Typecheck	go vet ./...	Built-in, always available
Lint	golangci-lint run, go fmt -l	Skip if golangci-lint not installed
Test	go test ./...	Built-in, always available
Coverage	go test -cover ./...	Built-in, always available

Rust Project

Check	Tools to Try (in priority order)	Fallback
Typecheck	cargo check	Built-in, always available
Lint	cargo clippy -- -D warnings	Built-in, always available
Test	cargo test	Built-in, always available
Coverage	cargo tarpaulin --out Html	Skip if tarpaulin not installed

Step 3: Run Quality Checks

For each detected project type, run all available checks in this order:

1. Typecheck first — catches type errors early
2. Lint second — style and code quality
3. Test third — functional correctness
4. Coverage fourth — test comprehensiveness

Key behaviors:

• Run each check independently (don't skip subsequent checks if one fails)
• Capture exit codes and output for reporting
• If --fix flag provided, run lint with auto-fix flags:
  • Node: eslint --fix, oxlint --fix, biome lint --write
  • Python: ruff check --fix, ruff format
  • Go: gofmt -w, golangci-lint run --fix
  • Rust: cargo clippy --fix (requires nightly)
• For coverage checks, compare against threshold (default 80%, configurable with --coverage-min=NN)

Step 4: Report Results

Display results in a clear table format:

QUALITY GATE REPORT
═══════════════════════════════════════════════════════════

Project Type: Node.js
Package Manager: bun

Check         Status    Details
─────────────────────────────────────────────────────────
Typecheck     ✓ PASS    (0 errors, 0 warnings)
Lint          ✓ PASS    (0 issues)
Test          ✓ PASS    (42 passed, 2 skipped)
Coverage      ✓ PASS    (92% statements, 88% branches)
─────────────────────────────────────────────────────────

OVERALL: ✓ ALL CHECKS PASSED
═══════════════════════════════════════════════════════════

Safe to commit. Run: git commit -m "your message"

If any check fails:

QUALITY GATE REPORT
═══════════════════════════════════════════════════════════

Project Type: Node.js
Package Manager: bun

Check         Status    Details
─────────────────────────────────────────────────────────
Typecheck     ✗ FAIL    (3 errors)
Lint          ✓ PASS    (0 issues)
Test          ✗ FAIL    (1 failed, 41 passed)
Coverage      ⊘ SKIP    (Test failures prevent coverage)
─────────────────────────────────────────────────────────

OVERALL: ✗ QUALITY GATE BLOCKED
═══════════════════════════════════════════════════════════

Blockers:
  • Fix 3 TypeScript errors
    → Error at src/utils.ts:15: Type 'string' is not assignable to type 'number'
    → Error at src/api.ts:8: Property 'id' does not exist on type 'User'
    → Error at src/api.ts:20: Missing return type annotation

  • Fix 1 test failure
    → Test: parseDate should parse ISO dates
      Expected: '2025-01-01', Got: '2025-01-01T00:00:00Z'

To auto-fix linting issues, run: /quality-gate --fix

Step 5: Block or Approve

If all checks pass: Recommend running git commit

If any check fails:

1. List blocking issues clearly
2. Suggest fixes (e.g., "run: eslint --fix", "fix TypeScript errors before committing")
3. Do NOT allow commit to proceed
4. If --fix flag was provided, re-run after auto-fixes to validate

---

Worked Example: Node.js Project (Complete Walkthrough)

Detection Phase

$ /quality-gate

🔍 Detecting project type...
  ✓ Found package.json
  ✓ Found bun.lockb (using Bun package manager)
  ✓ Found tsconfig.json (TypeScript project)
  ✓ Found .eslintrc.json (ESLint configured)
  ✓ Found jest.config.js (Jest test runner)

Detected: Node.js (Bun) with TypeScript
Available checks: typecheck, lint, test, coverage

Check Phase (All Pass)

Running checks...

✓ Typecheck (bun check)
  0 errors, 0 warnings
  Completed in 2.3s

✓ Lint (eslint)
  0 issues
  Completed in 1.8s

✓ Test (bun test)
  42 passed, 0 failed, 2 skipped
  Completed in 8.5s

✓ Coverage (bun test --coverage)
  Statements: 92%
  Branches: 88%
  Functions: 94%
  Lines: 92%
  Completed in 9.1s

Report Phase (Success)

QUALITY GATE REPORT
═══════════════════════════════════════════════════════════

Project Type: Node.js (Bun)
TypeScript: enabled
Test Framework: Jest

Check         Status    Details
─────────────────────────────────────────────────────────
Typecheck     ✓ PASS    (0 errors, 0 warnings)
Lint          ✓ PASS    (0 issues)
Test          ✓ PASS    (42 passed, 0 failed)
Coverage      ✓ PASS    (92% statements, meets 80% threshold)
─────────────────────────────────────────────────────────

OVERALL: ✓ ALL CHECKS PASSED
═══════════════════════════════════════════════════════════

✅ Safe to commit. Run: git commit -m "your message"

Check Phase (With Failures)

Running checks...

✗ Typecheck (bun check)
  3 errors
    src/api.ts:8 - Property 'id' does not exist on type 'User'
    src/api.ts:15 - Type 'string' is not assignable to type 'number'
    src/utils.ts:22 - Missing return type annotation
  Completed in 2.3s

✓ Lint (eslint)
  0 issues
  Completed in 1.8s

✗ Test (bun test)
  39 passed, 2 failed, 1 skipped
  FAIL src/email.test.ts
    ✕ validateEmail should reject empty string
      Expected: false
      Received: true
  FAIL src/math.test.ts
    ✕ add should sum two numbers
      Expected: 3
      Received: 4
  Completed in 8.5s

⊘ Coverage (skipped due to test failures)

Report Phase (With Failures)

QUALITY GATE REPORT
═══════════════════════════════════════════════════════════

Project Type: Node.js (Bun)
TypeScript: enabled
Test Framework: Jest

Check         Status    Details
─────────────────────────────────────────────────────────
Typecheck     ✗ FAIL    (3 errors)
Lint          ✓ PASS    (0 issues)
Test          ✗ FAIL    (2 failed, 39 passed)
Coverage      ⊘ SKIP    (Test failures prevent coverage check)
─────────────────────────────────────────────────────────

OVERALL: ✗ QUALITY GATE BLOCKED
═══════════════════════════════════════════════════════════

Fix the following blockers before committing:

1. TypeScript Errors (3 total):
   src/api.ts:8 - Property 'id' does not exist on type 'User'
   src/api.ts:15 - Type 'string' is not assignable to type 'number'
   src/utils.ts:22 - Missing return type annotation

2. Test Failures (2 total):
   src/email.test.ts - validateEmail should reject empty string
   src/math.test.ts - add should sum two numbers

Next steps:
  1. Fix TypeScript errors in src/api.ts and src/utils.ts
  2. Update tests in src/email.test.ts and src/math.test.ts
  3. Run: /quality-gate (to re-check)
  4. Commit: git commit -m "your message"

---

Python Project Example

Detection & Checks

$ /quality-gate

🔍 Detecting project type...
  ✓ Found pyproject.toml
  ✓ Found pytest.ini
  ✓ Found ruff.toml

Detected: Python project
Available checks: typecheck (mypy), lint (ruff), test (pytest), coverage

Running checks...

✓ Typecheck (mypy)
  No errors
  Completed in 3.2s

✓ Lint (ruff check)
  0 issues
  Completed in 1.1s

✓ Test (pytest)
  24 passed, 0 failed
  Completed in 5.8s

✓ Coverage (pytest --cov)
  Statements: 85%
  Branches: 79%
  Completed in 6.2s

---

--fix Flag Example

$ /quality-gate --fix

🔍 Detecting project type...
  ✓ Found package.json (Node.js)
  ✓ Found tsconfig.json (TypeScript)

Running checks...

✓ Typecheck (bun check)
  0 errors, 0 warnings

🔧 Lint (eslint --fix)
  Found 5 issues, fixed 5 issues
  Completed in 1.8s

✓ Test (bun test)
  42 passed, 0 failed

✓ Coverage (bun test --coverage)
  92% statements

QUALITY GATE REPORT
═══════════════════════════════════════════════════════════

Check         Status    Details
─────────────────────────────────────────────────────────
Typecheck     ✓ PASS    (no errors)
Lint          ✓ PASS    (5 issues auto-fixed)
Test          ✓ PASS    (42 passed)
Coverage      ✓ PASS    (92% statements, meets 80%)
─────────────────────────────────────────────────────────

OVERALL: ✓ ALL CHECKS PASSED
═══════════════════════════════════════════════════════════

✅ Safe to commit. Run: git commit -m "your message"

---

Framework-Specific Commands

Node.js / Bun

# Detect and run all checks
/quality-gate

# Auto-fix linting issues
/quality-gate --fix

# Custom coverage threshold
/quality-gate --coverage-min=90

# Combine flags
/quality-gate --fix --coverage-min=85

Python

# Detect and run all checks
/quality-gate

# Auto-fix with ruff
/quality-gate --fix

# Set custom threshold
/quality-gate --coverage-min=75

Go

# Run all checks
/quality-gate

# Auto-format code
/quality-gate --fix

Rust

# Run all checks
/quality-gate

# Auto-fix with clippy
/quality-gate --fix

---

Dead Code Detection (--deadcode flag)

When the --deadcode flag is provided, run dead code detection after lint passes:

Node.js Projects

Tool	Detection	Install Check
ts-unused-exports	Unused exports	package.json has ts-unused-exports in devDependencies
knip	Unused exports, files, deps, types	package.json has knip in devDependencies
ts-prune	Unused exports only	package.json has ts-prune in devDependencies

Preferred tool: ts-unused-exports (lightweight, no dependency conflicts in monorepos). Use knip for comprehensive scans if zod version is compatible.

If project has a deadcode script in package.json: Use that (bun run deadcode, npm run deadcode, etc.)

If no dead code tool is installed: Report: "No dead code tool configured. Consider adding ts-unused-exports: bun add -d ts-unused-exports"

Report Format

Dead Code Analysis
─────────────────────────────────────────────────
Unused exports:     12 found
Unused files:        3 found
Unused dependencies: 2 found
Unused types:        5 found
─────────────────────────────────────────────────

Top unused exports:
  src/utils/legacy.ts: formatOldDate, parseOldFormat
  src/api/deprecated.ts: oldEndpoint
  libs/core/auth/src/index.ts: AuthV1Client

⚠️  Dead code scan is INFORMATIONAL — does not block commit.
    Review findings and clean up in a separate commit.

Key behaviors:

• Dead code results do NOT block commit (informational only)
• Always recommend cleaning dead code in a separate commit
• If knip returns errors (config issues), report the error and suggest checking knip.config.ts

---

Success Checklist

After running /quality-gate, verify:

• Project type detected correctly
• All available checks identified
• Typecheck passes (or skipped if not applicable)
• Lint passes (or auto-fixed with --fix flag)
• Tests pass (or blockers clearly listed)
• Coverage meets threshold (80% by default, or custom value)
• Dead code report shown (if --deadcode flag provided)
• Report clearly shows pass/fail per check
• If any check fails, blockers are clearly documented
• Ready to commit (if all checks pass)