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

init.lua

@@ -342,19 +342,29 @@ end
 
 minetest.register_entity("creeper:creeper",def)
 
-minetest.register_craftitem("creeper:spawnegg",{
-	description = "Creeper Spawn Egg",
-	inventory_image = "creeper_spawnegg.png",
-	stack_max = 64,
-	on_place = function(itemstack,placer,pointed_thing)
-		if pointed_thing.type == "node" then
-			local pos = pointed_thing.above
-			pos.y = pos.y+1
-			minetest.add_entity(pos,"creeper:creeper")
-			if not minetest.setting_getbool("creative_mode") then
-				itemstack:take_item()
+if minetest.global_exists("spawneggs") then
+	minetest.register_craftitem("creeper:spawnegg",{
+		description = "Creeper Spawn Egg",
+		inventory_image = "creeper_spawnegg.png",
+		stack_max = 64,
+		on_place = function(itemstack,placer,pointed_thing)
+			if pointed_thing.type == "node" then
+				local pos = pointed_thing.above
+				pos.y = pos.y+1
+				minetest.add_entity(pos,"creeper:creeper")
+				if not minetest.setting_getbool("creative_mode") then
+					itemstack:take_item()
+				end
+				return itemstack
 			end
-			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