Code Review Checklist Javascript

Standard Operating Procedure: Code Review Checklist (JavaScript)

1. Document Control & Revision History

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2. Executive Summary & Scope

This SOP defines the rigorous quality assurance protocols for JavaScript source code review within the enterprise ecosystem. The scope encompasses all ECMAScript (ES6+) implementations, Node.js backend services, and browser-side client modules. Compliance with this procedure is mandatory for all commits targeting production-grade branches. Objectives include minimizing technical debt, enforcing security hardening, and ensuring architectural alignment with enterprise scalability standards.

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3. Prerequisites & Tool Requirements

• Access Control: Read/Write access to the enterprise Version Control System (VCS).
• Static Analysis Tools: ESLint (configured with @enterprise/eslint-config), Prettier, and SonarQube integration.
• Security Suite: Snyk or OWASP Dependency-Check (latest definitions).
• Environment: Node.js LTS runtime; containerized CI/CD pipeline access.
• Certification: Peer reviewer must hold "Senior Engineering" status or formal delegation from the Engineering Lead.

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4. Roles & Responsibilities (RACI Matrix)

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5. Step-by-Step Operational Procedure

Phase I: Static Analysis & Security

• Verify build passes without warnings in the local CI pipeline.
• Confirm zero high-severity vulnerabilities identified by Snyk/Dependabot.
• Ensure all new dependencies are authorized per the enterprise "Approved Library List."

Phase II: Logical Correctness & Performance

• Validate that asynchronous operations utilize async/await patterns over nested callbacks.
• Confirm proper error handling via try/catch blocks; verify no generic "swallowing" of exceptions.
• Check for memory leak risks (e.g., dangling event listeners, global variable accumulation).
• Verify efficient loop operations; confirm O(n) or O(log n) complexity for data transformation routines.

Phase III: Maintainability & Style

• Enforce usage of strict equality operators (=== vs ==).
• Verify modularity: ensure no single file exceeds the 300-line threshold.
• Confirm code readability: meaningful variable naming and JSDoc documentation for public methods.
• Audit for hardcoded credentials, API keys, or environment-specific configuration strings.

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6. Quality Assurance & Verification Criteria

Code quality is audited against the following thresholds:

• Cyclomatic Complexity: Max 10 per function.
• Test Coverage: Minimum 85% branch coverage required for new feature modules.
• Linting: Zero "Error" level linting infractions.
• Acceptance Benchmark: Code must be "Merge Ready" only after documented peer approval and passing all automated gates.

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7. Practical Troubleshooting Scenarios

Scenario A: Large PR (Pull Request) Bloat

• Failure: A PR contains >500 lines of logic, making effective auditing impossible.
• Protocol: Immediate rejection (status: "Needs Refactoring"). The reviewer will request the author to decompose the PR into logical, atomic commits (max 200 lines per PR) categorized by functional context.

Scenario B: Dependency Vulnerability Detected

• Failure: An integrated library is flagged for a Critical CVE (Common Vulnerabilities and Exposures).
• Protocol: The build pipeline must be hard-stopped. The developer is required to either patch to a secure version, implement a vendor-supported mitigation, or substitute the library with an approved, secure alternative.

Scenario C: Performance Regression

• Failure: Pre-deployment load testing indicates a latency increase >15% compared to the baseline.
• Protocol: Revert merge status. Deploy profile-guided analysis (e.g., Chrome DevTools or Node.js --inspect) to identify the specific execution bottleneck. Verification requires a performance report confirming the regression is resolved.