diff --git a/Libraries/Alert/Alert.js b/Libraries/Alert/Alert.js
index 1e03d1d136df3a..3eef5b2c1556e0 100644
--- a/Libraries/Alert/Alert.js
+++ b/Libraries/Alert/Alert.js
@@ -15,32 +15,8 @@ import Platform from '../Utilities/Platform';
 import DialogManagerAndroid, {
   type DialogOptions,
 } from '../NativeModules/specs/NativeDialogManagerAndroid';
-
-const RCTAlertManager = NativeModules.AlertManager;
-
-export type Buttons = Array<{
-  text?: string,
-  onPress?: ?Function,
-  style?: AlertButtonStyle,
-}>;
-
-type Options = {
-  cancelable?: ?boolean,
-  onDismiss?: ?Function,
-};
-
-type AlertType = $Keys<{
-  default: string,
-  'plain-text': string,
-  'secure-text': string,
-  'login-password': string,
-}>;
-
-export type AlertButtonStyle = $Keys<{
-  default: string,
-  cancel: string,
-  destructive: string,
-}>;
+import RCTAlertManager from './RCTAlertManager';
+import {type Buttons, type Options, type AlertType} from './NativeAlertManager';
 
 /**
  * Launches an alert dialog with the specified title and message.
@@ -126,11 +102,14 @@ class Alert {
         );
 
         const callback = type;
+        if (!RCTAlertManager) {
+          return;
+        }
         RCTAlertManager.alertWithArgs(
           {
             title: title || '',
             type: 'plain-text',
-            defaultValue: message,
+            defaultValue: message || '',
           },
           (id, value) => {
             callback(value);
@@ -161,6 +140,9 @@ class Alert {
         });
       }
 
+      if (!RCTAlertManager) {
+        return;
+      }
       RCTAlertManager.alertWithArgs(
         {
           title: title || '',
@@ -174,6 +156,7 @@ class Alert {
         },
         (id, value) => {
           const cb = callbacks[id];
+          // $FlowFixMe
           cb && cb(value);
         },
       );
diff --git a/Libraries/Alert/NativeAlertManager.js b/Libraries/Alert/NativeAlertManager.js
new file mode 100644
index 00000000000000..dc22fe5412de96
--- /dev/null
+++ b/Libraries/Alert/NativeAlertManager.js
@@ -0,0 +1,51 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+
+import type {TurboModule} from 'RCTExport';
+import * as TurboModuleRegistry from 'TurboModuleRegistry';
+import Platform from '../Utilities/Platform';
+
+export type Buttons = Array<{
+  text?: string,
+  onPress?: ?() => void,
+  style?: AlertButtonStyle,
+}>;
+
+export type Options = {
+  cancelable?: ?boolean,
+  onDismiss?: ?() => void,
+};
+
+/* 'default' | plain-text' | 'secure-text' | 'login-password' */
+export type AlertType = string;
+
+/* 'default' | 'cancel' | 'destructive' */
+export type AlertButtonStyle = string;
+
+type Args = {|
+  title: string,
+  message?: string,
+  buttons?: Buttons,
+  type?: string,
+  defaultValue?: string,
+  cancelButtonKey?: string,
+  destructiveButtonKey?: string,
+  keyboardType?: string,
+|};
+
+export interface Spec extends TurboModule {
+  +alertWithArgs: (
+    args: Args,
+    callback: (id: number, value: string) => void,
+  ) => void;
+}
+
+export default (Platform.OS === 'ios'
+  ? TurboModuleRegistry.getEnforcing<Spec>('AlertManager')
+  : undefined);
diff --git a/Libraries/Alert/RCTAlertManager.ios.js b/Libraries/Alert/RCTAlertManager.ios.js
index 246967358982b9..53bda2a5984764 100644
--- a/Libraries/Alert/RCTAlertManager.ios.js
+++ b/Libraries/Alert/RCTAlertManager.ios.js
@@ -10,6 +10,6 @@
 
 'use strict';
 
-const RCTAlertManager = require('../BatchedBridge/NativeModules').AlertManager;
+import RCTAlertManager from './NativeAlertManager';
 
 module.exports = RCTAlertManager;