Code Review Checklist for Angular Developers

SOP-ENG-ANG-001: Code Review Checklist for Angular Developers

1. Document Control & Revision History

2. Executive Summary & Scope

This Standard Operating Procedure (SOP) defines the mandatory technical review standards for Angular-based front-end applications. The scope encompasses all feature branches, bug fixes, and refactoring tasks submitted for integration into the master/main branch. This document ensures compliance with enterprise architectural patterns, security protocols, and performance benchmarks, mitigating technical debt and runtime vulnerabilities.

3. Prerequisites & Tool Requirements

• Access Control: Read/Write access to the Enterprise Git Repository and CI/CD Pipeline (e.g., Jenkins/GitHub Actions).
• Software Requirements: Angular CLI (LTS version), Node.js (Active LTS), SonarQube CLI, and Prettier/ESLint configuration files.
• Security Tools: Access to SAST (Static Application Security Testing) toolsets (e.g., Snyk or Checkmarx).
• Hardware: Local machine with minimum 16GB RAM and SSD storage for rapid compilation and testing cycles.

4. Roles & Responsibilities (RACI Matrix)

5. Step-by-Step Operational Procedure

Phase I: Static Analysis & Linting

• Ensure project compiles without warnings via ng build --configuration production.
• Verify npm run lint returns zero errors; adhere to eslint rulesets.
• Confirm no hardcoded secrets or PII (Personally Identifiable Information) exist in the codebase.

Phase II: Architectural & Pattern Review

• Confirm adherence to Angular "Container/Presentational" component patterns.
• Verify proper usage of OnPush change detection strategy where applicable.
• Ensure subscription management: All Observable subscriptions must be handled via takeUntil() or AsyncPipe.
• Validate that business logic is encapsulated in Services or NgRx effects, not in components.

Phase III: State Management & Data Integrity

• Verify that HTTP interactions are managed within injectable services.
• Confirm API error handling is implemented globally via HttpInterceptor.
• Validate state selectors are memoized to prevent redundant store re-computations.

Phase IV: Performance & Test Coverage

• Verify Unit Test coverage exceeds the 80% threshold.
• Confirm bundle-analyzer reports no bloated dependencies (Lazy loading enforced).
• Ensure trackBy functions are implemented in all *ngFor directives.

6. Quality Assurance & Verification Criteria

7. Practical Troubleshooting Scenarios

Scenario A: Memory Leak Detected

• Symptom: Component remains in heap memory after destruction due to active event listeners or unresolved Observables.
• Corrective Action: Immediate audit of ngOnDestroy lifecycle hooks. Implement Subscription.unsubscribe() or switch to AsyncPipe. Verification requires a browser memory heap snapshot comparison.

Scenario B: CI/CD Pipeline Failure (Bundle Size)

• Symptom: Pipeline rejects build due to exceeding the 500KB initial chunk limit.
• Corrective Action: Review AppRoutingModule. Move heavy feature modules to lazy-loading paths. If external libraries are the cause, replace with tree-shakable alternatives or configure webpack exclusion rules.

Scenario C: Cross-Site Scripting (XSS) Vulnerability Flag

• Symptom: SonarQube flags unsafe usage of [innerHTML] or DomSanitizer.bypassSecurityTrustHtml.
• Corrective Action: Immediate removal of bypass methods. Sanitize input strings using established DOMPurify libraries or revert to standard Angular property binding to allow native sanitization.