In JS, without worker threads or similar situations, you don't have real race conditions. Therefore, concurrency primitives like mutexes, condition variables, barriers, semaphores, etc. are not necessary.

You can use a global variable and it will be fine because it won't be accessed simultaneously.

So truly what this is is https://www.youtube.com/watch?v=aYSSYm0b2wk

What makes data races not a "real race condition"?

Anyhow, do what you will. I don't get the impression that you are genuinely interested in this topic.

Thanks for conceding the point. Have fun.