Add pass to lower useState

compiler/packages/babel-plugin-react-forget/src/Entrypoint/Pipeline.ts

@@ -7,6 +7,7 @@
 
 import { NodePath } from "@babel/traverse";
 import * as t from "@babel/types";
+import { lowerUseState } from "../Forest";
 import {
   HIRFunction,
   ReactiveFunction,
@@ -245,6 +246,15 @@ export function* run(
     value: reactiveFunction,
   });
 
+  if (config?.enableForest) {
+    lowerUseState(reactiveFunction);
+    yield log({
+      kind: "reactive",
+      name: "LowerUseState",
+      value: reactiveFunction,
+    });
+  }
+
   promoteUsedTemporaries(reactiveFunction);
   yield log({
     kind: "reactive",

compiler/packages/babel-plugin-react-forget/src/ReactiveScopes/index.ts

@@ -28,3 +28,9 @@ export { pruneTemporaryLValues as pruneUnusedLValues } from "./PruneTemporaryLVa
 export { pruneUnusedLabels } from "./PruneUnusedLabels";
 export { pruneUnusedScopes } from "./PruneUnusedScopes";
 export { renameVariables } from "./RenameVariables";
+export {
+  ReactiveFunctionTransform,
+  Transformed,
+  eachReactiveValueOperand,
+  visitReactiveFunction,
+} from "./visitors";