Map-based user tracking

hereNow initialization

Join handling

Leave and timeout handling

State-change handling

Interval event handling

Occupancy tracking

Callback hooks exposed

withPresence subscription

beforeunload cleanup

Timeout at least 2x heartbeat

Event Engine enabled

Persistent unique userId

Connection status handling

Device count tracking

Count decrement on disconnect

Graceful leave distinction

No duplicate user entries

First join tracked

Main channel grant

Presence channel grant

Selective presence channels

TTL on grants

Auth key or token used

Map-based cache

TTL-based expiry

Returns cached on hit

Fetches on miss or expiry

Optimized hereNow flags

Multi-channel support