From b43f0d5c596f22619d8db7c548c1f4d7bd76eb32 Mon Sep 17 00:00:00 2001
From: Dmitriy Kovalenko <dmtr.kovalenko@outlook.com>
Date: Sat, 28 Mar 2020 22:15:42 +0200
Subject: [PATCH] Replace ?? operator with manual !== undefined

---
 packages/material-ui/src/FormControl/FormControl.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/material-ui/src/FormControl/FormControl.js b/packages/material-ui/src/FormControl/FormControl.js
index 07fdceec6ea3de..4512a9741c5f76 100644
--- a/packages/material-ui/src/FormControl/FormControl.js
+++ b/packages/material-ui/src/FormControl/FormControl.js
@@ -120,7 +120,7 @@ const FormControl = React.forwardRef(function FormControl(props, ref) {
   });
 
   const [_focused, setFocused] = React.useState(false);
-  const focused = visuallyFocused ?? _focused;
+  const focused = visuallyFocused !== undefined ? visuallyFocused : _focused;
 
   if (disabled && focused) {
     setFocused(false);