[material-ui] Fix Accessing element.ref

packages/mui-material/src/Fade/Fade.js

@@ -6,6 +6,7 @@ import elementAcceptingRef from '@mui/utils/elementAcceptingRef';
 import { useTheme } from '../zero-styled';
 import { reflow, getTransitionProps } from '../transitions/utils';
 import useForkRef from '../utils/useForkRef';
+import getChildRef from '../utils/getChildRef';
 
 const styles = {
   entering: {
@@ -48,7 +49,7 @@ const Fade = React.forwardRef(function Fade(props, ref) {
 
   const enableStrictModeCompat = true;
   const nodeRef = React.useRef(null);
-  const handleRef = useForkRef(nodeRef, children.ref, ref);
+  const handleRef = useForkRef(nodeRef, getChildRef(children), ref);
 
   const normalizedTransitionCallback = (callback) => (maybeIsAppearing) => {
     if (callback) {

packages/mui-material/src/Grow/Grow.js

@@ -7,6 +7,7 @@ import { Transition } from 'react-transition-group';
 import { useTheme } from '../zero-styled';
 import { getTransitionProps, reflow } from '../transitions/utils';
 import useForkRef from '../utils/useForkRef';
+import getChildRef from '../utils/getChildRef';
 
 function getScale(value) {
   return `scale(${value}, ${value ** 2})`;
@@ -61,7 +62,7 @@ const Grow = React.forwardRef(function Grow(props, ref) {
   const theme = useTheme();
 
   const nodeRef = React.useRef(null);
-  const handleRef = useForkRef(nodeRef, children.ref, ref);
+  const handleRef = useForkRef(nodeRef, getChildRef(children), ref);
 
   const normalizedTransitionCallback = (callback) => (maybeIsAppearing) => {
     if (callback) {

packages/mui-material/src/Slide/Slide.js

@@ -10,6 +10,7 @@ import useForkRef from '../utils/useForkRef';
 import { useTheme } from '../zero-styled';
 import { reflow, getTransitionProps } from '../transitions/utils';
 import { ownerWindow } from '../utils';
+import getChildRef from '../utils/getChildRef';
 
 // Translate the node so it can't be seen on the screen.
 // Later, we're going to translate the node back to its original location with `none`.
@@ -119,7 +120,7 @@ const Slide = React.forwardRef(function Slide(props, ref) {
   } = props;
 
   const childrenRef = React.useRef(null);
-  const handleRef = useForkRef(children.ref, childrenRef, ref);
+  const handleRef = useForkRef(getChildRef(children), childrenRef, ref);
 
   const normalizedTransitionCallback = (callback) => (isAppearing) => {
     if (callback) {

packages/mui-material/src/Tooltip/Tooltip.js

@@ -19,6 +19,7 @@ import useForkRef from '../utils/useForkRef';
 import useId from '../utils/useId';
 import useControlled from '../utils/useControlled';
 import tooltipClasses, { getTooltipUtilityClass } from './tooltipClasses';
+import getChildRef from '../utils/getChildRef';
 
 function round(value) {
   return Math.round(value * 1e5) / 1e5;
@@ -545,7 +546,7 @@ const Tooltip = React.forwardRef(function Tooltip(inProps, ref) {
     };
   }, [handleClose, open]);
 
-  const handleRef = useForkRef(children.ref, setChildNode, ref);
+  const handleRef = useForkRef(getChildRef(children), setChildNode, ref);
 
   // There is no point in displaying an empty tooltip.
   // So we exclude all falsy values, except 0, which is valid.

packages/mui-material/src/Zoom/Zoom.js

@@ -6,6 +6,7 @@ import elementAcceptingRef from '@mui/utils/elementAcceptingRef';
 import { useTheme } from '../zero-styled';
 import { reflow, getTransitionProps } from '../transitions/utils';
 import useForkRef from '../utils/useForkRef';
+import getChildRef from '../utils/getChildRef';
 
 const styles = {
   entering: {
@@ -48,7 +49,7 @@ const Zoom = React.forwardRef(function Zoom(props, ref) {
   } = props;
 
   const nodeRef = React.useRef(null);
-  const handleRef = useForkRef(nodeRef, children.ref, ref);
+  const handleRef = useForkRef(nodeRef, getChildRef(children), ref);
 
   const normalizedTransitionCallback = (callback) => (maybeIsAppearing) => {
     if (callback) {

packages/mui-material/src/utils/getChildRef.d.ts

@@ -0,0 +1 @@
+export default function getChildRef(child: React.ReactElement): React.Ref<any> | null;

packages/mui-material/src/utils/getChildRef.js

@@ -0,0 +1,10 @@
+import * as React from 'react';
+
+export default function getChildRef(child) {
+  if (!child || !React.isValidElement(child)) {
+    return null;
+  }
+  // 'ref' is passed as prop in React 19, whereas 'ref' is directly attached to children in React 18
+  // below check is to ensure 'ref' is accessible in both cases
+  return child.props.propertyIsEnumerable('ref') ? child.props.ref : child.ref;
+}