TypeScript and ESLint Version Compatibility Warning

This article explains how to resolve the warning: "You are currently running a version of TypeScript which is not officially supported by @typescript-eslint/typescript-estree" and provides practical solutions to maintain compatibility between your TypeScript and ESLint dependencies.

Understanding the Warning

The warning occurs when your TypeScript version falls outside the supported range of your @typescript-eslint/typescript-estree package. This package is a dependency of various ESLint plugins that handle TypeScript parsing.

Example warning message:

=============
WARNING: You are currently running a version of TypeScript which is not 
officially supported by @typescript-eslint/typescript-estree.

You may find that it works just fine, or you may not.

SUPPORTED TYPESCRIPT VERSIONS: >=3.3.1 <4.4.0
YOUR TYPESCRIPT VERSION: 4.4.2

Please only submit bug reports when using the officially supported 
version.
=============

Recommended Solutions

1. Update Your ESLint Dependencies

The most effective solution is to update your ESLint-related packages to versions that support your TypeScript version:

npm i eslint@latest @typescript-eslint/parser@latest @typescript-eslint/eslint-plugin@latest --save-dev

After updating, your package.json might include compatible versions like:

{
  "devDependencies": {
    "eslint": "^8.38.0",
    "@typescript-eslint/parser": "^6.9.0",
    "@typescript-eslint/eslint-plugin": "^6.9.0",
    "typescript": "^5.0.4"
  }
}

2. Identify Dependency Conflicts

If updating doesn't resolve the issue, identify which package is pulling in the incompatible version:

npm why @typescript-eslint/typescript-estree

This command shows the dependency tree, helping you identify which package is causing the version mismatch. Common culprits include:

• eslint-plugin-jest
• eslint-plugin-testing-library
• eslint-config-next

3. Use Package Manager Overrides (Advanced)

For npm (version 8.3+), add an overrides section to your package.json:

{
  "overrides": {
    "@typescript-eslint/typescript-estree": "$@typescript-eslint/typescript-estree"
  }
}

For yarn, use the resolutions field:

{
  "resolutions": {
    "@typescript-eslint/typescript-estree": "^6.9.1"
  }
}

WARNING

Use overrides/resolutions carefully, as they can introduce compatibility issues with other dependencies.

Version Compatibility Reference

Here's a quick reference for @typescript-eslint/typescript-estree and TypeScript version compatibility:

typescript-estree Version	Supported TypeScript Version
8.26.0	TypeScript 5.8
8.10.0	TypeScript 5.6
7.14.0	TypeScript 5.5
7.2.0	TypeScript 5.4
6.13.0	TypeScript 5.3
6.5.0	TypeScript 5.2
5.61.0	TypeScript 5.1
5.55.0	TypeScript 5.0

INFO

Check the official changelog for the most current compatibility information.

Alternative: Suppress the Warning

If you're confident your setup works despite the warning, you can disable it in your ESLint configuration:

// eslint.config.js or .eslintrc.js
export default {
  languageOptions: {
    parserOptions: {
      warnOnUnsupportedTypeScriptVersion: false,
    },
  },
};

DANGER

Suppressing the warning is not recommended for production environments, as you might miss legitimate compatibility issues.

Troubleshooting Steps

If you're still experiencing issues:

1. Clear package manager caches:

   rm -rf node_modules package-lock.json
   npm install

2. Update related ESLint plugins:

   • eslint-config-next (for Next.js projects)
   • eslint-plugin-jest
   • eslint-plugin-testing-library

3. Check for global TypeScript installations:

   npx tsc --version
   npm list -g typescript

Conclusion

The TypeScript/ESLint version mismatch warning typically indicates outdated ESLint-related dependencies. The recommended approach is to update your @typescript-eslint packages to versions compatible with your TypeScript version. For complex dependency trees, use npm why to identify conflicts and consider using package manager overrides if necessary.

Always verify compatibility using the official TypeScript ESLint compatibility table before implementing solutions.