Heal event

[ChiefArug]

Was told by Max to leave an issue here for it. Forge event is net.minecraftforge.event.entity.living.LivingHealEvent.

I'm not sure Fabric has an equivalent event, though if it doesn't it should be easy enough to realise with a mixin(?)

A quick search of the fabric github for heal returns no results so I assume that is the case

https://github.com/KubeJS-Mods/KubeJS/issues/440