From 20b7da6f1311c36a5bacdb523f2a6a235737a57b Mon Sep 17 00:00:00 2001
From: Philipp Hugenroth <philipph@spotify.com>
Date: Fri, 5 May 2023 16:40:57 +0200
Subject: [PATCH] Add changeset

Signed-off-by: Philipp Hugenroth <philipph@spotify.com>
---
 .changeset/weak-snails-sparkle.md            | 24 ++++++++++++++++++++
 packages/theme/src/unified/overrides.test.ts |  2 +-
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/weak-snails-sparkle.md

diff --git a/.changeset/weak-snails-sparkle.md b/.changeset/weak-snails-sparkle.md
new file mode 100644
index 0000000000..55450e0869
--- /dev/null
+++ b/.changeset/weak-snails-sparkle.md
@@ -0,0 +1,24 @@
+---
+'@backstage/app-defaults': minor
+'@backstage/test-utils': minor
+'@backstage/theme': minor
+'@backstage/plugin-techdocs-addons-test-utils': patch
+'@backstage/cli': patch
+---
+
+**MUI v5 Support:** Adding platform-wide support for MUI v5 allowing a transition phase for migrating central plugins & components over. We still support v4 instances & plugins by adding a
+
+To allow the future support of plugins & components using MUI v5 you want to upgrade your `AppTheme`'s to using the `UnifiedThemeProvider`
+
+```diff
+     Provider: ({ children }) => (
+-    <ThemeProvider theme={lightTheme}>
+-      <CssBaseline>{children}</CssBaseline>
+-    </ThemeProvider>
++    <UnifiedThemeProvider theme={builtinThemes.light} children={children} />
+     ),
+```
+
+**'@backstage/test-utils':** Test App Wrapper is using `UnifiedThemeProvider` for tests now.
+**'@backstage/plugin-techdocs-addons-test-utils':** Fix avoiding test to run on unmount.
+**'@backstage/cli':** Enforcing MUI v5 specific linting to minimize bundle size.
diff --git a/packages/theme/src/unified/overrides.test.ts b/packages/theme/src/unified/overrides.test.ts
index 38b4738444..e84cedade6 100644
--- a/packages/theme/src/unified/overrides.test.ts
+++ b/packages/theme/src/unified/overrides.test.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { Theme } from '@mui/material';
+import { Theme } from '@mui/material/styles';
 import { transformV5ComponentThemesToV4 } from './overrides';
 
 describe('transformV5ComponentThemesToV4', () => {