Use 'spawneggs' & 'tnt' to craft 'creeper:spawnegg'

init.lua

@@ -342,7 +342,8 @@ end
 
 minetest.register_entity("creeper:creeper",def)
 
-minetest.register_craftitem("creeper:spawnegg",{
+if minetest.global_exists("spawneggs") then
+	minetest.register_craftitem("creeper:spawnegg",{
 		description = "Creeper Spawn Egg",
 		inventory_image = "creeper_spawnegg.png",
 		stack_max = 64,
@@ -357,4 +358,13 @@ minetest.register_craftitem("creeper:spawnegg",{
 				return itemstack
 			end
 		end
-})
+	})
+
+	minetest.register_craft({
+		output = "creeper:spawnegg",
+		type = "shapeless",
+		recipe = {"spawneggs:egg", "tnt:tnt",},
+	})
+
+	minetest.register_alias("spawneggs:creeper", "creeper:spawnegg")
+end

mod.conf

@@ -3,3 +3,4 @@ title = Creeper
 description = Adds some explosive nuisance.
 author = Rui
 depends = default, tnt
+optional_depends = spawneggs