diff --git a/src/types/utils/AsMutable.ts b/src/types/utils/AsMutable.ts
new file mode 100644
index 000000000000..57c49058cd14
--- /dev/null
+++ b/src/types/utils/AsMutable.ts
@@ -0,0 +1,5 @@
+import type {Writable} from 'type-fest';
+
+const asMutable = <T>(value: T): Writable<T> => value as Writable<T>;
+
+export default asMutable;
diff --git a/tests/utils/PusherHelper.js b/tests/utils/PusherHelper.ts
similarity index 68%
rename from tests/utils/PusherHelper.js
rename to tests/utils/PusherHelper.ts
index 3d0ce1404a91..1d6833e43504 100644
--- a/tests/utils/PusherHelper.js
+++ b/tests/utils/PusherHelper.ts
@@ -1,7 +1,9 @@
-import CONFIG from '../../src/CONFIG';
-import CONST from '../../src/CONST';
-import * as Pusher from '../../src/libs/Pusher/pusher';
-import PusherConnectionManager from '../../src/libs/PusherConnectionManager';
+import type {OnyxUpdate} from 'react-native-onyx';
+import CONFIG from '@src/CONFIG';
+import CONST from '@src/CONST';
+import * as Pusher from '@src/libs/Pusher/pusher';
+import PusherConnectionManager from '@src/libs/PusherConnectionManager';
+import asMutable from '@src/types/utils/AsMutable';
 
 const CHANNEL_NAME = `${CONST.PUSHER.PRIVATE_USER_CHANNEL_PREFIX}1${CONFIG.PUSHER.SUFFIX}`;
 
@@ -10,8 +12,8 @@ function setup() {
     // channel already in a subscribed state. These methods are normally used to prevent
     // duplicated subscriptions, but we don't need them for this test so forcing them to
     // return false will make the testing less complex.
-    Pusher.isSubscribed = jest.fn().mockReturnValue(false);
-    Pusher.isAlreadySubscribing = jest.fn().mockReturnValue(false);
+    asMutable(Pusher).isSubscribed = jest.fn().mockReturnValue(false);
+    asMutable(Pusher).isAlreadySubscribing = jest.fn().mockReturnValue(false);
 
     // Connect to Pusher
     PusherConnectionManager.init();
@@ -22,12 +24,9 @@ function setup() {
     });
 }
 
-/**
- * @param {Array} args
- */
-function emitOnyxUpdate(args) {
+function emitOnyxUpdate(args: OnyxUpdate[]) {
     const channel = Pusher.getChannel(CHANNEL_NAME);
-    channel.emit(Pusher.TYPE.MULTIPLE_EVENTS, [
+    channel?.emit(Pusher.TYPE.MULTIPLE_EVENTS, [
         {
             eventType: Pusher.TYPE.MULTIPLE_EVENT_TYPE.ONYX_API_UPDATE,
             data: args,