Strict types

Author: eps1lon

packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js

@@ -3401,7 +3401,7 @@ export function suspendResource(
   }
 }
 
-export function waitForCommitToBeReady(): null | ((() => any) => Function) {
+export function waitForCommitToBeReady(): null | ((() => void) => () => void) {
   if (suspendedState === null) {
     throw new Error(
       'Internal React Error: suspendedState null when it was expected to exists. Please report this as a React bug.',

packages/react-reconciler/src/ReactFiberWorkLoop.js

@@ -3089,8 +3089,6 @@ function commitRoot(
     ReactSharedInternals.T = prevTransition;
     setCurrentUpdatePriority(previousUpdateLanePriority);
   }
-
-  return null;
 }
 
 function commitRootImpl(