diff --git a/types/scheduler/index.d.ts b/types/scheduler/index.d.ts
index e65961b975..ca51a04d60 100644
--- a/types/scheduler/index.d.ts
+++ b/types/scheduler/index.d.ts
@@ -19,10 +19,11 @@ export const unstable_UserBlockingPriority = 2;
 export const unstable_NormalPriority = 3;
 export const unstable_IdlePriority = 5;
 export const unstable_LowPriority = 4;
-export function unstable_runWithPriority<T>(priorityLevel: number, eventHandler: () => T): T | undefined;
+export function unstable_runWithPriority<T>(priorityLevel: number, eventHandler: () => T): T;
 export function unstable_scheduleCallback(priorityLevel: number, callback: FrameCallbackType, options?: { delay?: number, timeout?: number}): CallbackNode;
+export function unstable_next<T>(eventHandler: () => T): T;
 export function unstable_cancelCallback(callbackNode: CallbackNode): void;
-export function unstable_wrapCallback(callback: FrameCallbackType): () => FrameCallbackType | undefined;
+export function unstable_wrapCallback(callback: FrameCallbackType): () => FrameCallbackType;
 export function unstable_getCurrentPriorityLevel(): number;
 export function unstable_shouldYield(): boolean;
 export function unstable_continueExecution(): void;
diff --git a/types/scheduler/test/scheduler.ts b/types/scheduler/test/scheduler.ts
index e1b9ddf9da..f8a2a217bd 100644
--- a/types/scheduler/test/scheduler.ts
+++ b/types/scheduler/test/scheduler.ts
@@ -1,4 +1,4 @@
-import { unstable_scheduleCallback, unstable_cancelCallback, unstable_now, unstable_NormalPriority } from 'scheduler';
+import { unstable_scheduleCallback, unstable_cancelCallback, unstable_now, unstable_NormalPriority, unstable_next } from 'scheduler';
 
 // $ExpectType CallbackNode
 const callbackNode = unstable_scheduleCallback(unstable_NormalPriority, () => {}, { timeout: 100 });
@@ -7,3 +7,8 @@ unstable_scheduleCallback(unstable_NormalPriority, () => {}, { delay: 100 });
 
 // $ExpectType number
 unstable_now();
+
+// $ExpectType number
+const nextNumberResult = unstable_next(() => 42);
+// $ExpectType string
+const nextStringResult = unstable_next(() => 'Hello');