NPM avertit TAR [email protected]: Cette version de TAR n'est plus prise en charge et ne recevra pas de mises à jour de sécurité. Veuillez mettre à niveau dès que possible.

To Solve npm WARN deprecated [email protected]: This version of tar is no longer supported, and will not receive security updates.
Please upgrade asap Error Just create react project with npx command and you will not face any deprecation error. 
Here is command:
npx create-react-app my-app && cd my-app && npm start and now, your error should be disappear.
Farmer N21