From 9763acef2ba6f046f8b3f9529c6834173c6bef97 Mon Sep 17 00:00:00 2001
From: Janpot <2109932+Janpot@users.noreply.github.com>
Date: Mon, 1 Jun 2026 19:42:28 +0200
Subject: [PATCH] [material-ui] Keep CSS theme variables out of the default
 theme

---
 packages/mui-material/src/styles/defaultTheme.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/packages/mui-material/src/styles/defaultTheme.js b/packages/mui-material/src/styles/defaultTheme.js
index 094155f2e31e4a..71b00ca7d3251a 100644
--- a/packages/mui-material/src/styles/defaultTheme.js
+++ b/packages/mui-material/src/styles/defaultTheme.js
@@ -1,6 +1,11 @@
 'use client';
-import createTheme from './createTheme';
+// `createTheme()` with no arguments is definitionally identical to `createThemeNoVars()`
+// (the public `createTheme` returns `createThemeNoVars(options)` for the default
+// `cssVariables: false` path). Importing `createThemeNoVars` directly keeps the CSS
+// theme-variables machinery (`createThemeWithVars` and friends) out of every component
+// bundle that only needs this default fallback theme.
+import createThemeNoVars from './createThemeNoVars';
 
-const defaultTheme = createTheme();
+const defaultTheme = createThemeNoVars();
 
 export default defaultTheme;