For that matter, anyone who'd like to have "fun" with concurrency and lock management in browser-side JS is free to play around with recurring asynchronous data

For that matter, anyone who'd like to have "fun" with concurrency and lock management in browser-side JS is free to play around with recurring asynchronous data fetching cached in localStorage when multiple browser tabs are open. Spoiler: locks are the wrong approach and you should be relying on events/callbacks instead. Oddly enough, that's similar to my gut feeling about Threads in JS.