Verification Loop — Frontend (Angular)

Run a comprehensive quality check on Angular/TypeScript code after changes.

Stack: Angular/TypeScript

When to Use

• After completing a feature or significant frontend code change
• Before creating a PR
• After refactoring components, services, or state management
• When you want to ensure quality gates pass

Verification Phases

Phase 1: Build

ng build --configuration production 2>&1 | tail -20

If build fails, STOP and fix before continuing. Production build catches AOT compilation issues that dev mode misses.

Phase 2: Type Check

npx tsc --noEmit 2>&1 | head -30

Report all type errors. Fix critical ones before continuing.

Phase 3: Lint / Format Check

# ESLint
ng lint --max-warnings 0 2>&1 | head -30
# Or: npx eslint . --max-warnings 0

# Prettier (if configured)
npx prettier --check "src/**/*.{ts,html,scss}" 2>&1 | head -10

# Stylelint (if configured)
npx stylelint "src/**/*.scss" 2>&1 | head -10

If --fix flag:

ng lint --fix
npx prettier --write "src/**/*.{ts,html,scss}"

Phase 4: Test Suite (Vitest)

Tests run through Angular CLI (ng test) which delegates to Vitest 4.x as the test runner.

ng test --watch=false --code-coverage 2>&1 | tail -50

Tests use @testing-library/angular for component testing — prefer its queries (getByRole, getByText) over direct DOM access.

Report:

Total tests: X
Passed: X
Failed: X
Coverage: X%

Phase 5: Service Worker Verification

After a successful build, verify the service worker configuration:

# Check ngsw-config.json is valid
cat ngsw-config.json | python3 -m json.tool > /dev/null 2>&1 && echo "VALID" || echo "INVALID"

# Verify service worker is in build output
ls dist/*/ngsw-worker.js 2>/dev/null && echo "SW present" || echo "SW missing"
ls dist/*/ngsw.json 2>/dev/null && echo "SW manifest present" || echo "SW manifest missing"

Phase 5b: Aspire Runtime Check (Optional)

If the frontend is served through an Aspire AppHost, verify runtime health:

Step 1 — Resource health:

mcp__aspire__list_resources

Verify the frontend resource (proxy or container) shows Running. Check the API resource is also healthy — frontend failures are often caused by backend issues.

Step 2 — Console errors:

mcp__aspire__list_console_logs  resourceName: "site"

Scan for Angular runtime errors: ERROR, ExpressionChangedAfterItHasBeenCheckedError, NullInjectorError, NG0, chunk load failures, or CORS errors.

Step 3 — API errors from frontend requests:

mcp__aspire__list_structured_logs  resourceName: "api"

Filter for Error severity. Check for 4xx/5xx responses triggered by frontend requests — these indicate API contract mismatches, missing endpoints, or authorization issues that the frontend is hitting at runtime.

Report any errors found as verification failures.

Skip if the frontend is not part of an Aspire deployment.

Phase 6: Security Scan

# npm dependency vulnerabilities
npm audit --production 2>&1 | head -20

# Check for console.log left in source (should use proper logging)
grep -rn "console\.\(log\|debug\)" --include="*.ts" src/ 2>/dev/null | grep -v "\.spec\.ts" | head -10

# Check for debugger statements
grep -rn "debugger" --include="*.ts" src/ 2>/dev/null | grep -v "\.spec\.ts" | head -5

# Check for hardcoded API URLs or tokens
grep -rn "localhost:\|http://\|Bearer \|apikey" --include="*.ts" src/ 2>/dev/null | grep -v "environment" | grep -v "\.spec\.ts" | head -10

Phase 7: Diff Review

git diff --stat
git diff HEAD~1 --name-only

Review each changed file for:

• Unintended changes
• Missing error handling (uncaught Observable errors)
• any types that should be properly typed
• Missing OnPush change detection where appropriate
• Missing unsubscribe / takeUntilDestroyed on subscriptions
• Hardcoded strings that should be in i18n files
• Missing data-testid attributes on interactive elements

Output Format

VERIFICATION REPORT — Frontend (Angular)
==========================================

Build:     [PASS/FAIL]
TypeCheck: [PASS/FAIL] (X errors)
Lint:      [PASS/FAIL] (X warnings)
Tests:     [PASS/FAIL] (X/Y passed, Z% coverage)
SW:        [PASS/FAIL] (service worker check)
Aspire:    [PASS/SKIP] (proxy health)
Security:  [PASS/FAIL] (X issues)
Diff:      [X files changed]

Overall:   [READY/NOT READY] for PR

Issues to Fix:
1. ...
2. ...

Flags

CI Alignment

These verification phases mirror what GitHub Actions CI runs: npm ci, ng build --configuration production. Running this locally catches the same issues CI would flag, avoiding failed PR checks.