Godot implementation of Unity ScriptableObject pattern for observable values.

int_observer.gd

class_name IntObserver
extends Node

signal value_changed(value: int)

@export var observable: ObservableInt:
	set(v):
		if observable:
			observable.changed.disconnect(_emit)
		observable = v
		if observable:
			observable.changed.connect(_emit)
			_emit()

func _ready() -> void:
	if observable:
		_emit()

func _emit() -> void:
	value_changed.emit(observable.value)

observable_int.gd

class_name ObservableInt
extends Resource

@export var value: int:
	set(v):
		value = v
		emit_changed()