Purpose

Quality Gates Skill

Automated quality checkpoints that ensure code meets standards before proceeding.

Gate Levels

1. Pre-Commit Gate

Runs before code is committed.

# TypeScript check
npx tsc --noEmit

# Lint check
npx eslint . --max-warnings 0

# Format check
npx prettier --check .

2. Pre-Push Gate

Runs before code is pushed.

# All pre-commit checks +
npm test -- --passWithNoTests

# Build check
npm run build

3. CI Gate

Runs in CI pipeline.

# All previous checks +
npm test -- --coverage

# Coverage threshold
# Fail if coverage < 70%

4. Pre-Deployment Gate

Runs before deployment.

# All CI checks +
# E2E tests
npx playwright test

# Security audit
npm audit --audit-level=high

# Performance check
npx lighthouse-ci

Gate Definitions

TypeScript Gate

// tsconfig.json
{
  "compilerOptions": {
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true
  }
}

Pass Criteria: Zero errors

ESLint Gate

// .eslintrc
{
  "extends": [
    "eslint:recommended",
    "@typescript-eslint/recommended",
    "@typescript-eslint/strict"
  ],
  "rules": {
    "@typescript-eslint/no-explicit-any": "error",
    "@typescript-eslint/no-unused-vars": "error",
    "no-console": "warn"
  }
}

Pass Criteria: Zero errors, zero warnings

Prettier Gate

// .prettierrc
{
  "semi": true,
  "singleQuote": true,
  "tabWidth": 2,
  "trailingComma": "es5"
}

Pass Criteria: All files formatted

Test Gate

// vitest.config.ts
export default defineConfig({
  test: {
    coverage: {
      provider: 'v8',
      thresholds: {
        statements: 70,
        branches: 65,
        functions: 70,
        lines: 70,
      },
    },
  },
});

Pass Criteria:

• All tests pass
• Coverage meets thresholds

Build Gate

npm run build

Pass Criteria: Build succeeds without errors

Security Gate

# Dependency vulnerabilities
npm audit --audit-level=high

# Exit codes:
# 0 = No vulnerabilities
# 1 = Vulnerabilities found

Pass Criteria: No high/critical vulnerabilities

Gate Implementation

Husky Pre-Commit Hook

#!/bin/sh
# .husky/pre-commit

npx lint-staged

// package.json
{
  "lint-staged": {
    "*.{ts,tsx}": [
      "eslint --fix",
      "prettier --write"
    ],
    "*.{json,md}": [
      "prettier --write"
    ]
  }
}

GitHub Actions Gate

name: Quality Gate

on: [push, pull_request]

jobs:
  quality:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: '22'
          cache: 'npm'

      - name: Install
        run: npm ci

      - name: TypeScript
        run: npm run typecheck

      - name: Lint
        run: npm run lint

      - name: Test
        run: npm test -- --coverage

      - name: Build
        run: npm run build

Quality Metrics

Code Quality

Metric	Threshold	Tool
Type Coverage	100%	TypeScript
Lint Errors	0	ESLint
Code Smells	< 5	SonarQube
Duplications	< 3%	SonarQube

Test Quality

Metric	Threshold	Tool
Statement Coverage	> 70%	Vitest
Branch Coverage	> 65%	Vitest
Test Pass Rate	100%	Vitest

Security

Metric	Threshold	Tool
Critical Vulns	0	npm audit
High Vulns	0	npm audit
Secrets	0	secretlint

Performance

Metric	Threshold	Tool
Bundle Size	< 500KB	vite
LCP	< 2.5s	Lighthouse
FID	< 100ms	Lighthouse

Gate Commands

# Run all gates
npm run quality

# Individual gates
npm run quality:types     # TypeScript
npm run quality:lint      # ESLint
npm run quality:test      # Tests
npm run quality:build     # Build
npm run quality:security  # Security audit

Gate Failure Handling

TypeScript Errors

1. Read error message
2. Fix type issue
3. Re-run npx tsc --noEmit

Lint Errors

1. Try auto-fix: npx eslint . --fix
2. Manually fix remaining
3. Re-run lint

Test Failures

1. Check failed test output
2. Fix code or test
3. Re-run tests

Build Failures

1. Check build output
2. Fix import/config issues
3. Re-run build

Security Failures

1. Run npm audit
2. Update vulnerable packages
3. If can't update, document exception