Add new pass to playground

compiler/forget/packages/playground/components/Editor/Output.tsx

@@ -31,6 +31,7 @@ const {
   printReactiveFunction,
   propagateScopeDependencies,
   pruneUnusedLabels,
+  pruneUnusedScopes,
 } = HIR;
 const MemoizedOutput = memo(Output);
 
@@ -97,6 +98,7 @@ function compile(source: string): CompilerOutput | CompilerError {
     pruneUnusedLabels(reactiveFunction);
     flattenReactiveLoops(reactiveFunction);
     propagateScopeDependencies(reactiveFunction);
+    pruneUnusedScopes(reactiveFunction);
     const reactiveFunctionOutput = printReactiveFunction(reactiveFunction);
 
     const ast = codegenReactiveFunction(reactiveFunction);

compiler/forget/src/index.ts

@@ -28,6 +28,7 @@ import { inferReactiveScopeVariables } from "./ReactiveScopes/InferReactiveScope
 import { printReactiveFunction } from "./ReactiveScopes/PrintReactiveFunction";
 import { propagateScopeDependencies } from "./ReactiveScopes/PropagateScopeDependencies";
 import { pruneUnusedLabels } from "./ReactiveScopes/PruneUnusedLabels";
+import { pruneUnusedScopes } from "./ReactiveScopes/PruneUnusedScopes";
 import { eliminateRedundantPhi } from "./SSA/EliminateRedundantPhi";
 import enterSSA from "./SSA/EnterSSA";
 import { leaveSSA } from "./SSA/LeaveSSA";
@@ -73,6 +74,7 @@ export const HIR = {
   printHIR,
   printReactiveFunction,
   pruneUnusedLabels,
+  pruneUnusedScopes,
 };
 
 export default BabelPlugin;