Grimrock

Does anyone know what code would need placed into the game to prevent people from resting. I'd like to be able to control when the player is able to rest.

return false from PartyComponent.onRest hook

You might want to do more than that. You could also allow resting for a few moments, then display a graphic image or text that explains why they cannot rest there; and force the party awake.

*In Eye of the Beholder 2 they did just this in a certain area with respawning ants.