Vercel Composition Patterns

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name: vercel-composition-patterns description: React composition patterns that scale. Use when refactoring components with boolean prop proliferation, building flexible component libraries, or designing reusable APIs. Triggers on tasks involving compound components, render props, context providers, or component architecture. Includes React 19 API changes. license: MIT metadata: author: vercel version: '1.0.0'

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React Composition Patterns

Composition patterns for building flexible, maintainable React components. Avoid boolean prop proliferation by using compound components, lifting state, and composing internals. These patterns make codebases easier for both humans and AI agents to work with as they scale.

When to Apply

Reference these guidelines when:

Refactoring components with many boolean props

Building reusable component libraries

Designing flexible component APIs

Reviewing component architecture

Working with compound components or context providers

Rule Categories by Priority

| Priority | Category | Impact | Prefix | | -------- | ----------------------- | ------ | --------------- | | 1 | Component Architecture | HIGH | architecture- | | 2 | State Management | MEDIUM | state- | | 3 | Implementation Patterns | MEDIUM | patterns- | | 4 | React 19 APIs | MEDIUM | react19- |

Quick Reference

1. Component Architecture (HIGH)

architecture-avoid-boolean-props - Don't add boolean props to customize

behavior; use composition

architecture-compound-components - Structure complex components with shared

context

2. State Management (MEDIUM)

state-decouple-implementation - Provider is the only place that knows how

state is managed

state-context-interface - Define generic interface with state, actions, meta

for dependency injection

state-lift-state - Move state into provider components for sibling access

3. Implementation Patterns (MEDIUM)

patterns-explicit-variants - Create explicit variant components instead of

boolean modes

patterns-children-over-render-props - Use children for composition instead

of renderX props

4. React 19 APIs (MEDIUM)

> ⚠️ React 19+ only. Skip this section if using React 18 or earlier.

react19-no-forwardref - Don't use forwardRef; use use() instead of useContext()

How to Use

Read individual rule files for detailed explanations and code examples:

rules/architecture-avoid-boolean-props.md
rules/state-context-interface.md

Each rule file contains:

Brief explanation of why it matters

Incorrect code example with explanation

Correct code example with explanation

Additional context and references

Full Compiled Document

For the complete guide with all rules expanded: AGENTS.md