Only One Tab
Run a function in exactly one open tab, switching to another if closed.
- Robust across browsers
- Fully tested
const onlyOneTab =// only one daemon will run at a time across all tabs
The callback is run only once per tab, and on exactly one tab at a time. When the actor tab that ran the callback is closed, then exactly one other open tab runs its callback to replace it as the actor.
After a browser crash, or something similar, the actor tab can be closed without being replaced normally.
Every tab periodically checks for an active tab's heartbeat, and after 1-4 seconds, a new tab will become the actor to replace the crashed tab. A refresh or new tab will do the check immediately on startup as well.
If nothing goes wrong, a new actor replaces the closed tab immediately.