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

@@ -7,21 +7,22 @@ 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")
+    if scope then
-    end; assert(scope)
+        -- sources are only tracked if the node in scope has an effect
+        local effect = scope.effect
+        scope.effect = false
 
-    -- sources are only tracked if the node in scope has an effect
+        local ok, result = pcall(source)
-    local effect = scope.effect
-    scope.effect = false
 
-    local ok, result = pcall(source)
+        scope.effect = effect :: () -> ()
 
-    scope.effect = effect :: () -> ()
+        if not ok then error(result, 0) end
 
-    if not ok then error(result, 0) end
+        return result
-
+    else
-    return result
+        return source()
+    end
 end
 
 return untrack