Handle React cleanup

packages/react-godot-renderer/src/Renderer.ts

@@ -1,5 +1,5 @@
 /** biome-ignore-all lint/complexity/noBannedTypes: {} is the "empty props" type in React */
-import type { Node, NodePathMap } from "godot"
+import { Callable, type Node, type NodePathMap } from "godot"
 import * as React from "react"
 import * as Reconciler from "./Reconciler.js"
 
@@ -21,10 +21,11 @@ export const renderComponent: {
     component: React.FC<{}>,
     props?: Record<string, unknown>,
 ): void => {
-    const reconciler = Reconciler.make()
+    if (!(container as any)._reactReconciler)
+        (container as any)._reactReconciler = Reconciler.make()
 
-    if (!(container as any)._rootContainer)
-        (container as any)._rootContainer = (reconciler as any).createContainer(
+    if (!(container as any)._reactContainer) {
+        (container as any)._reactContainer = (container as any)._reactReconciler.createContainer(
             container,
             ConcurrentRoot,
             null,
@@ -34,9 +35,23 @@ export const renderComponent: {
             console.error,
         )
 
-    reconciler.updateContainer(
+        const cleanup = Callable.create(container, function(this) {
+            (container as any)._reactReconciler.updateContainer(
+                null,
+                (container as any)._reactContainer,
+                null,
+            )
+            delete (container as any)._reactReconciler
+            delete (container as any)._reactContainer
+
+            container.tree_exiting.disconnect(cleanup)
+        })
+        container.tree_exiting.connect(cleanup)
+    }
+
+    (container as any)._reactReconciler.updateContainer(
         React.createElement(component, props),
-        (container as any)._rootContainer,
+        (container as any)._reactContainer,
         null,
     )
 }