I am working on an alarm clock using react native with expo. As I understand, I would need to run a background process to listen to scheduled alarms and then trigger them. From what I found, react native doesn't support background process using setTimeout but expo does seem to have an Calendar and BackgroundFetch API which might be useful.
Unfortunately BackgroundFetch isn't available in bare expo (non-manage) apps so that's out of question. I pretty much need standard alarm functionality so what are the possible ways it can be done without detaching from expo?