Allow untrack() in non-reactive scopes

Closes #17

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Changed
 
 - Reactive scopes created within reactive scopes are now destroyed on rerun.
+- `untrack()` can be called outside of reactive scopes.
 
 ---
 

src/untrack.luau

@@ -7,10 +7,8 @@ local get_scope = graph.get_scope
 
 local function untrack<T>(source: () -> T): T
     local scope = get_scope()
-    if not scope then
-        throw("cannot untrack in non-reactive scope")
-    end; assert(scope)
     
+    if scope then
         -- sources are only tracked if the node in scope has an effect
         local effect = scope.effect
         scope.effect = false
@@ -22,6 +20,9 @@ local function untrack<T>(source: () -> T): T
         if not ok then error(result, 0) end
 
         return result
+    else
+        return source()
+    end
 end
 
 return untrack