lib/entities-store: unref() timers 🐛

lib/entities-store.js

@@ -60,11 +60,20 @@ const createEntitiesStore = (ttl, now) => {
 	}
 
 	const put = (id, entity) => {
+		// console.error('put', id, entity) // todo: remove
 		del(id)
 
-		// todo: use sth more memory-efficient than closures?
-		// todo: set expiry relative to entity's timestamp?
-		timers.set(id, setTimeout(del, ttl, id))
+		{
+			// todo: use sth more memory-efficient than closures?
+			// todo: set expiry relative to entity's timestamp?
+			const timer = setTimeout(del, ttl, id)
+			timers.set(id, timer)
+			if (timer && timer.unref) {
+				// allow Node.js to exit by not requiring its event loop to remain active
+				// note: not available in browsers
+				timer.unref()
+			}
+		}
 
 		FeedEntity.verify(entity)
 		const data = FeedEntity.encode(entity).finish()