From efc96707451e9a94d69d984bc564ebccd4b254b7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@meta.com>
Date: Wed, 29 May 2024 11:13:01 -0700
Subject: [PATCH] Clean up old code for microtasks in Hermes (#44708)

Summary:

Changelog: [internal]

We had a fallback to use a Hermes internal API if the native module exposing `queueMicrotask` wasn't available. This is no longer necessary as the module is available everywhere we enable the event loop, so we can remove it.

Differential Revision: D57922076
---
 .../react-native/Libraries/Core/setUpTimers.js    | 15 +++++----------
 .../webapis/microtasks/specs/NativeMicrotasks.js  |  4 +++-
 2 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/packages/react-native/Libraries/Core/setUpTimers.js b/packages/react-native/Libraries/Core/setUpTimers.js
index db0ac5dc1e7cf3..f4bc4360ab921f 100644
--- a/packages/react-native/Libraries/Core/setUpTimers.js
+++ b/packages/react-native/Libraries/Core/setUpTimers.js
@@ -63,17 +63,12 @@ if (
   // mechanism to pass feature flags from RN to React in OSS.
   global.RN$enableMicrotasksInReact = true;
 
-  polyfillGlobal('queueMicrotask', () => {
-    const nativeQueueMicrotask =
+  polyfillGlobal(
+    'queueMicrotask',
+    () =>
       require('../../src/private/webapis/microtasks/specs/NativeMicrotasks')
-        .default?.queueMicrotask;
-    if (nativeQueueMicrotask) {
-      return nativeQueueMicrotask;
-    } else {
-      // For backwards-compatibility
-      return global.HermesInternal?.enqueueJob;
-    }
-  });
+        .default.queueMicrotask,
+  );
 
   // We shim the immediate APIs via `queueMicrotask` to maintain the backward
   // compatibility.
diff --git a/packages/react-native/src/private/webapis/microtasks/specs/NativeMicrotasks.js b/packages/react-native/src/private/webapis/microtasks/specs/NativeMicrotasks.js
index 5fa44e54803d0d..4f07158ad6b5e0 100644
--- a/packages/react-native/src/private/webapis/microtasks/specs/NativeMicrotasks.js
+++ b/packages/react-native/src/private/webapis/microtasks/specs/NativeMicrotasks.js
@@ -16,4 +16,6 @@ export interface Spec extends TurboModule {
   +queueMicrotask: (callback: () => mixed) => void;
 }
 
-export default (TurboModuleRegistry.get<Spec>('NativeMicrotasksCxx'): ?Spec);
+export default (TurboModuleRegistry.getEnforcing<Spec>(
+  'NativeMicrotasksCxx',
+): Spec);