From c8dffd892615c58c1f6e6c421dc4ce0f0c8749fd Mon Sep 17 00:00:00 2001
From: siriwatknp <siriwatkunaporn@gmail.com>
Date: Thu, 20 May 2021 10:02:05 +0700
Subject: [PATCH] follow Button composedClasses

---
 .../src/LoadingButton/LoadingButton.js              | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/packages/material-ui-lab/src/LoadingButton/LoadingButton.js b/packages/material-ui-lab/src/LoadingButton/LoadingButton.js
index daa4a4814f3f9f..5cba33ffa6964c 100644
--- a/packages/material-ui-lab/src/LoadingButton/LoadingButton.js
+++ b/packages/material-ui-lab/src/LoadingButton/LoadingButton.js
@@ -25,7 +25,12 @@ const useUtilityClasses = (styleProps) => {
     ],
   };
 
-  return composeClasses(slots, getLoadingButtonUtilityClass, classes);
+  const composedClasse = composeClasses(slots, getLoadingButtonUtilityClass, classes);
+
+  return {
+    ...classes,
+    ...composedClasse,
+  };
 };
 
 // TODO use `import { rootShouldForwardProp } from '../styles/experimentalStyled';` once move to core
@@ -123,15 +128,13 @@ const LoadingButton = React.forwardRef(function LoadingButton(inProps, ref) {
   };
 
   const classes = useUtilityClasses(styleProps);
+
   return (
     <LoadingButtonRoot
       disabled={disabled || loading}
       ref={ref}
       {...other}
-      classes={{
-        ...props.classes,
-        ...classes,
-      }}
+      classes={classes}
       styleProps={styleProps}
     >
       {loading && (