Add thread cleanup helper

CHANGELOG.md

@@ -11,6 +11,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 
 - `create("ClassName", { props })` and `create(Instance, { props })` syntax.
+- `cleanup()` now accepts `thread` types.
+
+### Changed
+
+- A scope can no longer be destroyed while it is active. Strict mode will check
+  for this.
 
 --------------------------------------------------------------------------------
 

docs/api/reactivity-utility.md

@@ -7,7 +7,7 @@ Queues a callback to run when a scope is reran or destroyed.
 - **Type**
 
     ```luau
-    function cleanup(v: Function | Disconnectable | Destroyable)
+    function cleanup(v: Function | Disconnectable | Destroyable | thread)
 
     type Function = () -> ()
     type Destroyable = { destroy: () -> () }

src/cleanup.luau

@@ -8,6 +8,7 @@ local push_cleanup = graph.push_cleanup
 local function helper(obj: any)
     return
         if typeof(obj) == "RBXScriptConnection" then function() obj:Disconnect() end
+        elseif type(obj) == "thread" then function() task.cancel(obj) end
         elseif typeof(obj) == "Instance" then function() obj:Destroy() end
         elseif obj.destroy then function() obj:destroy() end
         elseif obj.disconnect then function() obj:disconnect() end
@@ -35,6 +36,7 @@ type Disconnectable = { disconnect: (any) -> () } | { Disconnect: (any) -> () }
 
 return cleanup ::
     ( (callback: () -> ()) -> () ) &
+    ( (thread: thread) -> () ) &
     ( (instance: Destroyable) -> () ) &
     ( (connection: Disconnectable) -> () ) &
     ( (instance: Instance) -> () ) &