  - uses: actions/setup-node@v4
    with:
      node-version: "20"
      cache: "npm"

  - run: npm ci

  - name: Run tests with coverage
    run: npm test -- --coverage

  - name: Check coverage threshold
    run: |
      COVERAGE=$(node -p "require('./coverage/coverage-summary.json').total.lines.pct")
      THRESHOLD=80

      if (( $(echo "$COVERAGE < $THRESHOLD" | bc -l) )); then
        echo "❌ Coverage $COVERAGE% is below threshold $THRESHOLD%"
        exit 1
      fi

      echo "✅ Coverage $COVERAGE% meets threshold $THRESHOLD%"

  - name: Comment coverage on PR
    uses: romeovs/lcov-reporter-action@v0.3.1
    with:
      lcov-file: ./coverage/lcov.info
      github-token: ${{ secrets.GITHUB_TOKEN }}
      delete-old-comments: true


## Jest Configuration

```javascript
// jest.config.js
module.exports = {
  coverageThreshold: {
    global: {
      branches: 80,
      functions: 80,
      lines: 80,
      statements: 80,
    },
    "./src/critical/": {
      branches: 90,
      functions: 90,
      lines: 90,
      statements: 90,
    },
  },
};

Linting Gate

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

    - uses: actions/setup-node@v4
      with:
        node-version: "20"
        cache: "npm"

    - run: npm ci

    - name: Run ESLint
      run: npm run lint -- --max-warnings 0

    - name: Check formatting
      run: npm run format:check

Type Checking Gate

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

    - uses: actions/setup-node@v4
      with:
        node-version: "20"
        cache: "npm"

    - run: npm ci

    - name: TypeScript check
      run: npx tsc --noEmit

Security Scanning

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

    - name: Run Snyk security scan
      uses: snyk/actions/node@master
      env:
        SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
      with:
        args: --severity-threshold=high

    - name: Audit dependencies
      run: npm audit --audit-level=moderate

    - name: Check for outdated dependencies
      run: |
        OUTDATED=$(npm outdated || true)
        if [ ! -z "$OUTDATED" ]; then
          echo "⚠️ Outdated dependencies found:"
          echo "$OUTDATED"
        fi

Bundle Size Gate

bundle-size:
  runs-on: ubuntu-latest
  steps:
    - uses: actions/checkout@v4

    - uses: actions/setup-node@v4
      with:
        node-version: "20"
        cache: "npm"

    - run: npm ci
    - run: npm run build

    - name: Check bundle size
      uses: andresz1/size-limit-action@v1
      with:
        github_token: ${{ secrets.GITHUB_TOKEN }}
        skip_step: install

Required Status Checks

# .github/workflows/required-checks.yml
name: Required Checks

on:
  pull_request:

jobs:
  required:
    runs-on: ubuntu-latest
    needs: [lint, typecheck, test, coverage, security]
    if: always()
    steps:
      - name: Check all required jobs passed
        run: |
          if [ "${{ contains(needs.*.result, 'failure') }}" == "true" ]; then
            echo "❌ Required checks failed"
            exit 1
          fi
          echo "✅ All required checks passed"

Quality Thresholds

// quality-thresholds.ts
export const QUALITY_GATES = {
  coverage: {
    lines: 80,
    branches: 80,
    functions: 80,
    statements: 80,
  },
  linting: {
    maxWarnings: 0,
    maxErrors: 0,
  },
  bundleSize: {
    maxSize: "200kb",
    maxGzipSize: "100kb",
  },
  performance: {
    maxLighthouseScore: 90,
  },
  security: {
    maxVulnerabilities: 0,
    maxSeverity: "moderate",
  },
  dependencies: {
    maxOutdated: 5,
  },
};

Branch Protection Rules

# Configure via GitHub settings or API
{
  "required_status_checks":
    {
      "strict": true,
      "contexts":
        ["lint", "typecheck", "test", "coverage", "security", "bundle-size"],
    },
  "required_pull_request_reviews":
    {
      "required_approving_review_count": 1,
      "dismiss_stale_reviews": true,
      "require_code_owner_reviews": true,
    },
  "enforce_admins": true,
  "restrictions": null,
}

Quality Report

- name: Generate quality report
  run: |
    cat > quality-report.md << EOF
    # Quality Report

    ## Coverage
    - Lines: $(node -p "require('./coverage/coverage-summary.json').total.lines.pct")%
    - Branches: $(node -p "require('./coverage/coverage-summary.json').total.branches.pct")%
    - Functions: $(node -p "require('./coverage/coverage-summary.json').total.functions.pct")%

    ## Linting
    - ESLint warnings: $(npm run lint 2>&1 | grep -c warning || echo 0)
    - ESLint errors: $(npm run lint 2>&1 | grep -c error || echo 0)

    ## Type Safety
    - TypeScript errors: $(npx tsc --noEmit 2>&1 | grep -c error || echo 0)

    ## Security
    - Vulnerabilities: $(npm audit --json | jq '.metadata.vulnerabilities.total')

    ## Bundle Size
    - Main bundle: $(ls -lh dist/main.js | awk '{print $5}')
    EOF

- name: Comment report on PR
  uses: actions/github-script@v7
  with:
    script: |
      const fs = require('fs');
      const report = fs.readFileSync('quality-report.md', 'utf8');
      github.rest.issues.createComment({
        issue_number: context.issue.number,
        owner: context.repo.owner,
        repo: context.repo.repo,
        body: report
      });

Auto-fail on Thresholds

- name: Check all quality gates
  run: |
    EXIT_CODE=0

    # Coverage
    COVERAGE=$(node -p "require('./coverage/coverage-summary.json').total.lines.pct")
    if (( $(echo "$COVERAGE < 80" | bc -l) )); then
      echo "❌ Coverage below 80%"
      EXIT_CODE=1
    fi

    # Lint warnings
    WARNINGS=$(npm run lint 2>&1 | grep -c warning || echo 0)
    if [ "$WARNINGS" -gt 0 ]; then
      echo "❌ Found $WARNINGS lint warnings"
      EXIT_CODE=1
    fi

    # TypeScript errors
    if ! npx tsc --noEmit; then
      echo "❌ TypeScript errors found"
      EXIT_CODE=1
    fi

    # Security vulnerabilities
    if ! npm audit --audit-level=moderate; then
      echo "❌ Security vulnerabilities found"
      EXIT_CODE=1
    fi

    exit $EXIT_CODE

Best Practices

Strict thresholds: No compromises on quality
Fast feedback: Run checks early in CI
Clear messages: Explain why checks failed
Incremental improvement: Gradually increase thresholds
Bypass mechanism: For emergencies only
Local pre-commit: Catch issues before push
Team agreement: Align on standards

Linting Gate

Type Checking Gate

Security Scanning

Bundle Size Gate

Required Status Checks

Quality Thresholds

Branch Protection Rules

Quality Report

Auto-fail on Thresholds

Best Practices

Output Checklist

quality-gates-enforcer

Quality Gates Enforcer

Coverage Requirements