ESLint Plugin

The eslint-plugin-react-compiler package provides ESLint rules that surface problematic React code found by the React Compiler, helping you catch violations of the Rules of React before compilation.

Installation

npm install --save-dev eslint eslint-plugin-react-compiler

Configuration

Flat Config (ESLint 8+)

For modern ESLint flat config:

eslint.config.mjs

import reactCompiler from 'eslint-plugin-react-compiler';
import react from 'eslint-plugin-react';

export default [
  {
    plugins: {
      'react-compiler': reactCompiler,
    },
    rules: {
      'react-compiler/react-compiler': 'error',
    },
  },
];

Using Recommended Config

eslint.config.mjs

import reactCompiler from 'eslint-plugin-react-compiler';
import react from 'eslint-plugin-react';

export default [
  // Your existing config
  {
    ...react.configs.flat.recommended,
    settings: { react: { version: 'detect' } },
  },
  // Add React Compiler recommended config
  reactCompiler.configs.recommended,
];

Legacy Config (.eslintrc)

For .eslintrc configuration:

{
  "plugins": ["react-compiler"],
  "rules": {
    "react-compiler/react-compiler": "error"
  }
}

Rule Configuration

Error Level

Configure the rule severity:

export default [
  {
    rules: {
      // Error - blocks CI/commits
      'react-compiler/react-compiler': 'error',
      
      // Warning - shows in editor but doesn't fail
      // 'react-compiler/react-compiler': 'warn',
      
      // Off - disable the rule
      // 'react-compiler/react-compiler': 'off',
    },
  },
];

Rule Options

The rule accepts the same configuration options as the Babel plugin:

eslint.config.mjs

export default [
  {
    rules: {
      'react-compiler/react-compiler': [
        'error',
        {
          environment: {
            // Compiler environment options
            validateHooksUsage: true,
            validateRefAccessDuringRender: true,
            validateNoSetStateInRender: true,
          },
        },
      ],
    },
  },
];

What It Checks

The ESLint plugin runs the React Compiler on your code and reports React-specific errors. It validates:

Rules of Hooks

// ✗ Bad - conditional hook call
function Component({ condition }) {
  if (condition) {
    useState(0); // Error: Hooks cannot be called conditionally
  }
}

// ✓ Good
function Component({ condition }) {
  const [state, setState] = useState(0);
  if (condition) {
    setState(1);
  }
}

setState During Render

// ✗ Bad - unconditional setState in render
function Component() {
  const [count, setCount] = useState(0);
  setCount(count + 1); // Error: setState called during render
  return <div>{count}</div>;
}

// ✓ Good - setState in event handler
function Component() {
  const [count, setCount] = useState(0);
  const handleClick = () => setCount(count + 1);
  return <button onClick={handleClick}>{count}</button>;
}

Ref Access During Render

// ✗ Bad - accessing ref.current in render
function Component() {
  const ref = useRef(null);
  const value = ref.current; // Error: ref.current accessed during render
  return <div>{value}</div>;
}

// ✓ Good - access ref in effect or event handler
function Component() {
  const ref = useRef(null);
  useEffect(() => {
    console.log(ref.current);
  });
  return <div ref={ref}>Content</div>;
}

Exhaustive Dependencies

// ✗ Bad - missing dependency
function Component({ userId }) {
  const [user, setUser] = useState(null);
  useEffect(() => {
    fetchUser(userId).then(setUser);
  }, []); // Error: Missing dependency 'userId'
}

// ✓ Good - complete dependencies
function Component({ userId }) {
  const [user, setUser] = useState(null);
  useEffect(() => {
    fetchUser(userId).then(setUser);
  }, [userId]);
}

Component Mutations

// ✗ Bad - mutating props
function Component({ items }) {
  items.push('new'); // Error: Mutating props
  return <List items={items} />;
}

// ✓ Good - creating new array
function Component({ items }) {
  const newItems = [...items, 'new'];
  return <List items={newItems} />;
}

Integration with Existing Setup

With eslint-plugin-react-hooks

Use both plugins together:

eslint.config.mjs

import reactHooks from 'eslint-plugin-react-hooks';
import reactCompiler from 'eslint-plugin-react-compiler';

export default [
  {
    plugins: {
      'react-hooks': reactHooks,
      'react-compiler': reactCompiler,
    },
    rules: {
      'react-hooks/rules-of-hooks': 'error',
      'react-hooks/exhaustive-deps': 'warn',
      'react-compiler/react-compiler': 'error',
    },
  },
];

With TypeScript

eslint.config.mjs

import tseslint from '@typescript-eslint/eslint-plugin';
import reactCompiler from 'eslint-plugin-react-compiler';

export default [
  {
    files: ['**/*.ts', '**/*.tsx'],
    plugins: {
      '@typescript-eslint': tseslint,
      'react-compiler': reactCompiler,
    },
    rules: {
      'react-compiler/react-compiler': 'error',
    },
  },
];

File-Based Configuration

eslint.config.mjs

import reactCompiler from 'eslint-plugin-react-compiler';

export default [
  {
    // Strict checking for new code
    files: ['src/features/**/*.{js,jsx,ts,tsx}'],
    rules: {
      'react-compiler/react-compiler': 'error',
    },
  },
  {
    // Warnings for legacy code
    files: ['src/legacy/**/*.{js,jsx,ts,tsx}'],
    rules: {
      'react-compiler/react-compiler': 'warn',
    },
  },
];

Editor Integration

VS Code

Install the ESLint extension:

Install ESLint extension
Add to .vscode/settings.json:

.vscode/settings.json

{
  "eslint.validate": [
    "javascript",
    "javascriptreact",
    "typescript",
    "typescriptreact"
  ],
  "editor.codeActionsOnSave": {
    "source.fixAll.eslint": true
  }
}

WebStorm / IntelliJ IDEA

Go to Settings → Languages & Frameworks → JavaScript → Code Quality Tools → ESLint
Enable “Automatic ESLint configuration”
Set “Run eslint —fix on save”

Vim / Neovim

Use ALE or coc-eslint:

.vimrc

" ALE
let g:ale_linters = {'javascript': ['eslint']}
let g:ale_fixers = {'javascript': ['eslint']}

" Or with coc.nvim
" :CocInstall coc-eslint

CI/CD Integration

GitHub Actions

.github/workflows/lint.yml

name: Lint

on: [push, pull_request]

jobs:
  eslint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '18'
      - run: npm ci
      - run: npm run lint

GitLab CI

.gitlab-ci.yml

lint:
  stage: test
  image: node:18
  script:
    - npm ci
    - npm run lint

Pre-commit Hook

Use husky and lint-staged:

{
  "lint-staged": {
    "*.{js,jsx,ts,tsx}": "eslint --fix"
  }
}

Troubleshooting

”No files matching the pattern were found”

Ensure your ESLint config includes the correct file patterns:

eslint.config.mjs

export default [
  {
    files: ['**/*.{js,jsx,ts,tsx}'],
    // ...
  },
];

“Failed to load plugin ‘react-compiler’”

Verify the plugin is installed:

npm list eslint-plugin-react-compiler

Reinstall if necessary:

npm install --save-dev eslint-plugin-react-compiler

High Memory Usage

For large codebases, increase Node memory:

package.json

{
  "scripts": {
    "lint": "NODE_OPTIONS='--max-old-space-size=4096' eslint ."
  }
}

Slow Linting

Use ESLint cache:

eslint --cache --cache-location node_modules/.cache/eslint .

Or in package.json:

{
  "scripts": {
    "lint": "eslint --cache ."
  }
}

Ignoring Violations

File-Level

/* eslint-disable react-compiler/react-compiler */
function LegacyComponent() {
  // Non-compliant code
}
/* eslint-enable react-compiler/react-compiler */

Line-Level

function Component() {
  // eslint-disable-next-line react-compiler/react-compiler
  if (condition) useState(0);
}

.eslintignore

# Ignore legacy code
src/legacy/

# Ignore build output
build/
dist/

# Ignore dependencies
node_modules/

Best Practices

Gradual Adoption

Start with warnings:

rules: { 'react-compiler/react-compiler': 'warn' }

Fix violations incrementally

Switch to errors:

rules: { 'react-compiler/react-compiler': 'error' }

Team Workflow

Local Development: Show warnings in editor
Pre-commit: Block commits with errors
CI/CD: Fail builds on errors
Code Review: Require fixes before merge

Documentation

Document exceptions:

// eslint-disable-next-line react-compiler/react-compiler
// Reason: Third-party library requires this pattern
// TODO: Refactor when library v2.0 is available
legacyAPI.method();

Next Steps

Configuration

Configure compiler validation options

Babel Plugin

Set up code transformation

How It Works

Understand the validation process

Contributing

Contribute to the ESLint plugin

Overview

Configuration

Development

​ESLint Plugin

​Installation

​Configuration

​Flat Config (ESLint 8+)

​Using Recommended Config

​Legacy Config (.eslintrc)

​Rule Configuration

​Error Level

​Rule Options

​What It Checks

​Rules of Hooks

​setState During Render

​Ref Access During Render

​Exhaustive Dependencies

​Component Mutations

​Integration with Existing Setup

​With eslint-plugin-react-hooks

​With TypeScript

​File-Based Configuration

​Editor Integration

​VS Code

​WebStorm / IntelliJ IDEA

​Vim / Neovim

​CI/CD Integration

​GitHub Actions

​GitLab CI

​Pre-commit Hook

​Troubleshooting

​”No files matching the pattern were found”

​“Failed to load plugin ‘react-compiler’”

​High Memory Usage

​Slow Linting

​Ignoring Violations

​File-Level

​Line-Level

​.eslintignore

​Best Practices

​Gradual Adoption

​Team Workflow

​Documentation

​Next Steps

Configuration

Babel Plugin

How It Works

Contributing

ESLint Plugin

Installation

Configuration

Flat Config (ESLint 8+)

Using Recommended Config

Legacy Config (.eslintrc)

Rule Configuration

Error Level

Rule Options

What It Checks

Rules of Hooks

setState During Render

Ref Access During Render

Exhaustive Dependencies

Component Mutations

Integration with Existing Setup

With eslint-plugin-react-hooks

With TypeScript

File-Based Configuration

Editor Integration

VS Code

WebStorm / IntelliJ IDEA

Vim / Neovim

CI/CD Integration

GitHub Actions

GitLab CI

Pre-commit Hook

Troubleshooting

”No files matching the pattern were found”

“Failed to load plugin ‘react-compiler’”

High Memory Usage

Slow Linting

Ignoring Violations

File-Level

Line-Level

.eslintignore

Best Practices

Gradual Adoption

Team Workflow

Documentation

Next Steps