Gnumaru

extends Node

func pack(p:Node)->PackedScene: var v = PackedScene.new(); v.pack(p); return v

class A extends Node:
	@export var m: String = "a"
	static func instantiate(p:PackedScene):
		var v: A = p.instantiate()
		v._post_init()
		return v

Gnumaru

# how to simulate a class property that can be asigned only the first time, like a 'final' property in java or a 'readonly' property in C#

#class_name ReadOnly
extends Node

# READONLY NON OBJECT WITH SPECIFIC TYPE
var readonly_int:int:
	set(p):
		if readonly_int != 0:printerr('cannot set readonly property "readonly_int" a second time'); return
		readonly_int = p