From d0fb1a1b1d7f76f4ccbcc0c715a8f68daed3a929 Mon Sep 17 00:00:00 2001
From: Shane <58125798+outofbearspace@users.noreply.github.com>
Date: Tue, 30 Apr 2024 18:45:49 -0700
Subject: [PATCH] return an EmptyQuery when querying for components that are
 not tied to any entities (#12)

* Update init.lua

* export Query type

* replace EmptyQuery with static reference
---
 lib/init.lua | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/init.lua b/lib/init.lua
index 8bffd3e..907f821 100644
--- a/lib/init.lua
+++ b/lib/init.lua
@@ -360,8 +360,9 @@ local EmptyQuery = {
 	without = noop
 }
 EmptyQuery.__index = EmptyQuery
+setmetatable(EmptyQuery, EmptyQuery)
 
-export type Query = typeof(setmetatable({}, EmptyQuery))
+export type Query = typeof(EmptyQuery)
 
 function World.query(world: World, ...: i53): Query
 	local compatibleArchetypes = {}
@@ -379,7 +380,7 @@ function World.query(world: World, ...: i53): Query
 	for i, componentId in components do 
 		local map = componentIndex[componentId]
 		if not map then
-			return setmetatable({}, EmptyQuery)
+			return EmptyQuery
 		end
 
 		if firstArchetypeMap == nil or map.size < firstArchetypeMap.size then 
@@ -415,7 +416,7 @@ function World.query(world: World, ...: i53): Query
 
 	local lastArchetype, compatibleArchetype = next(compatibleArchetypes)
 	if not lastArchetype then 
-		return setmetatable({}, EmptyQuery)
+		return EmptyQuery
 	end
 	
 	local preparedQuery = {}
@@ -439,7 +440,7 @@ function World.query(world: World, ...: i53): Query
 
 		lastArchetype, compatibleArchetype = next(compatibleArchetypes)
 		if not lastArchetype then 
-			return setmetatable({}, EmptyQuery)
+			return EmptyQuery
 		end
 		
 		return self