diff --git a/compiler/packages/babel-plugin-react-forget/src/HIR/Environment.ts b/compiler/packages/babel-plugin-react-forget/src/HIR/Environment.ts
index 749e40d4d9..c89fe379a2 100644
--- a/compiler/packages/babel-plugin-react-forget/src/HIR/Environment.ts
+++ b/compiler/packages/babel-plugin-react-forget/src/HIR/Environment.ts
@@ -50,6 +50,9 @@ export type Hook = {
 export type EnvironmentConfig = Partial<{
   customHooks: Map<string, Hook>;
 
+  // 🌲
+  enableForest: boolean;
+
   /**
    * Enable memoization of JSX elements in addition to other types of values. When disabled,
    * other types (objects, arrays, call expressions, etc) are memoized, but not known JSX
diff --git a/compiler/packages/fixture-test-utils/src/compiler-utils.ts b/compiler/packages/fixture-test-utils/src/compiler-utils.ts
index 43bcaad861..581611ed21 100644
--- a/compiler/packages/fixture-test-utils/src/compiler-utils.ts
+++ b/compiler/packages/fixture-test-utils/src/compiler-utils.ts
@@ -28,6 +28,7 @@ export function transformFixtureInput(
   let validateNoSetStateInRender = true;
   let enableEmitFreeze = null;
   let compilationMode: CompilationMode = "all";
+  let enableForest = false;
 
   if (firstLine.indexOf("@compilationMode(annotation)") !== -1) {
     assert(
@@ -83,6 +84,9 @@ export function transformFixtureInput(
       importSpecifierName: "makeReadOnly",
     };
   }
+  if (firstLine.includes("@enableForest true")) {
+    enableForest = true;
+  }
 
   return pluginFn(
     input,
@@ -111,6 +115,7 @@ export function transformFixtureInput(
         validateNoSetStateInRender,
         enableEmitFreeze,
         assertValidMutableRanges: true,
+        enableForest,
       },
       compilationMode,
       logger: null,