Rules

Ensure controlled inputs have onChange or readOnly

Validate default props match prop types

Enforce component display names

Enforce exhaustive dependencies in React hooks to prevent stale closures

Enforce event handler naming conventions

Detect missing or problematic React keys that could break reconciliation

Limit JSX nesting depth

Prevent .bind() in JSX

Prevent duplicate props in JSX

Prevent string literals in JSX

Forbid javascript: URLs

Forbid target="_blank" without rel="noopener noreferrer"

Disallow accessing this.state inside setState calls

Prevent adjacent inline elements

No Tailwind arbitrary values when a token exists for that property (R19)

Prevent arrow functions in lifecycle methods

Disallow passing children as props

Disallow dangerouslySetInnerHTML usage

Prevent using both children and dangerouslySetInnerHTML

data-testid must be consumer-provided — no runtime default value (R5)

Prevent using deprecated React methods

Prevent setState in componentDidMount

Prevent setState in componentDidUpdate

Prevent direct mutation of this.state that breaks React reconciliation

Prevent using findDOMNode

No inline `style={{}}` except for CSS-variable assignment (R18)

Prevent invalid HTML attributes

Prevent isMounted anti-pattern

Boolean props must not be prefixed with `is` (R8)

Ban `type`/`kind` string-union props that select between rendered trees (R11)

Prevent multiple components per file

Prevent namespace imports

Prevent object types as default props

No raw hex / rgb / hsl / oklch color literals in source — use design tokens (R19)

Prevent redundant shouldComponentUpdate

Prevent using render return value

Disallow usage of setState to encourage functional components with hooks

Disallow string refs

Disallow this from being used in stateless functional components

Catch common typos

Prevent unescaped entities

Disallow unknown DOM properties

Detects prevented re-renders in React

Prevent usage of unsafe lifecycle methods

Ban pure-passthrough wrapper sub-components — slot the primitive directly (R12)

Prefer ES6 classes over createClass

Prefer stateless functions

Enforce prop types usage

Suggest migrating React class components to hooks with detailed migration path

Ensure React is in scope

Prevent inline functions in React renders with performance metrics

Detects unnecessary re-renders and expensive computations in React

Named composition parts must carry data-slot (R6)

Require default props

Require performance optimizations for React components based on usage patterns

Require render methods to return

Enforce required attributes on React components with customizable ignore lists

Enforce component method ordering

Enforce state initialization in constructor

Enforce static property placement

Prevent void DOM elements from having children