code/datums/components/proximity_monitor.dm
| /datum/component/proximity_monitor | Attaching this component to an atom means that the atom will be able to detect mobs or objects moving within a specified radius of it. |
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| /obj/effect/abstract/proximity_checker | Inteded for use with the proximity checker component /datum/component/proximity_monitor.
Whenever a movable atom crosses this object, it calls HasProximity() on the object which is listening for proximity (hasprox_receiver). |