react-code-review

React Code Review

Overview

This skill provides structured, comprehensive code review for React applications. It evaluates code against React 19 best practices, component architecture patterns, hook usage, accessibility standards, and production-readiness criteria. The review produces actionable findings categorized by severity (Critical, Warning, Suggestion) with concrete code examples for improvements.

This skill delegates to the react-software-architect-review agent for deep architectural analysis when invoked through the agent system.

When to Use

• Reviewing React components, hooks, and pages before merging
• Validating component composition and reusability patterns
• Checking proper hook usage (useState, useEffect, useMemo, useCallback)
• Reviewing React 19 patterns (use, useOptimistic, useFormStatus, Actions)
• Evaluating state management approaches (local, context, external stores)
• Assessing performance optimization (memoization, code splitting, lazy loading)
• Reviewing accessibility compliance (WCAG, semantic HTML, ARIA)
• Validating TypeScript typing for props, state, and events
• Checking Tailwind CSS and styling patterns
• After implementing new React features or refactoring component architecture

Instructions

1. Identify Scope: Determine which React components and hooks are under review. Use glob to discover .tsx/.jsx files and grep to identify component definitions, hook usage, and context providers.

2. Analyze Component Architecture: Verify proper component composition — check for single responsibility, appropriate size, and reusability. Look for components that are too large (>200 lines), have too many props (>7), or mix concerns.

3. Review Hook Usage: Validate proper hook usage — check dependency arrays in useEffect/useMemo/useCallback, verify cleanup functions in useEffect, and identify unnecessary re-renders caused by missing or incorrect memoization.

4. Evaluate State Management: Assess where state lives — check for proper colocation, unnecessary lifting, and appropriate use of Context vs external stores. Verify that server state uses TanStack Query, SWR, or similar libraries rather than manual useEffect + useState patterns.