This project contains a Blackjack class that could be used to make a JavaScript game. Unfortunately, it cannot be used for React (out of the box) because of the way that React handles state.
Place this directory in the public directory of an Apache or NGINX server, and request the file test.html to run the tests. Alternatively, you could use http-server by browsing to the project directory in your terminal, and running the command npx http-server.