:apply() returns self

cf-lib/data/Item.lua

@@ -32,6 +32,7 @@ end
 --- Applies the item to the game
 function Item:apply()
     data:extend({ self.prototype })
+    return self
 end
 
 --- Assigns data to the item

cf-lib/data/Recipe.lua

@@ -32,6 +32,7 @@ end
 --- Applies the recipe to the game
 function Recipe:apply()
     data:extend({ self.prototype })
+    return self
 end
 
 --- Assigns data to the recipe

cf-lib/data/Technology.lua

@@ -40,6 +40,7 @@ end
 --- Applies the technology to the game
 function Technology:apply()
     data:extend({ self.prototype })
+    return self
 end
 
 --- Assigns data to the technology