The ReactJS class should not be registered as a service

[stof]

This class is executing some JS code in its constructor. This makes the constructor very heavy, and you don't want this to be executed on each instantiation of Twig (which happens on each request in most Symfony projects).
It should be instantiated only when needed to render an element

[jibriss]

Maybe he should just stop depending on reactjs/react-php-v8js
All your issues are related to this class ^^

[stof]

@jibriss they are indeed. And btw, the library is not really maintained.
the right solution would probably for @qpautrat to join the team maintaining the library to improve it.