From e8f496831089145a55f32bb8d19fa6300d774641 Mon Sep 17 00:00:00 2001
From: Martin Hochel <martinhochel@microsoft.com>
Date: Thu, 5 Jun 2025 17:32:56 +0200
Subject: [PATCH 1/2] feat(docsite-v9): add official platform support docs
 including React Versions

---
 .../Concepts/ReactVersionSupport.stories.mdx  | 68 +++++++++++++++++++
 .../Concepts/SupportedPlatforms.stories.mdx   | 23 +++++++
 2 files changed, 91 insertions(+)
 create mode 100644 apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx
 create mode 100644 apps/public-docsite-v9/src/Concepts/SupportedPlatforms.stories.mdx

diff --git a/apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx b/apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx
new file mode 100644
index 00000000000000..a52f16fb551ede
--- /dev/null
+++ b/apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx
@@ -0,0 +1,68 @@
+import { Meta } from '@storybook/addon-docs';
+
+<Meta title="Concepts/Developer/React Version Support" />
+
+# React Version Support
+
+> ℹ️ **Note**: Our migration docs focus solely on FluentUI related changes.
+
+If you're migrating between React major versions, please refer to the official React documentation for comprehensive migration guides.
+
+For migrating your codebase TypeScript types, you can leverage [Types React Codemod](https://github.com/eps1lon/types-react-codemod)
+
+## React 17
+
+Full support starting `@fluentui/react-components` v9.0.0.
+
+## React 18
+
+Full support starting `@fluentui/react-components` v9.65.0.
+
+### Migration
+
+> 💡 Check Following PR for further details https://github.com/microsoft/fluentui/pull/34456
+
+#### Runtime/API changes:
+
+NONE
+
+#### TypeScript types changes:
+
+##### Slot Children as a Function
+
+Because `@types/react@18` Breaking Changes, we needed to loosen `Slot` children property to `any`.
+
+This change will affect users that use `Slot` children as a function in conjunction with TypeScript strict mode.
+
+If that's your case, TypeScript will fail on `noImplicitAny`. To mitigate this you need to add type assertions (`satisfies SlotRenderFunction<T>`)
+
+Before:
+
+```tsx
+import * as React from 'React';
+
+<Button
+  // children was inferred as union of ReactNode and SlotRenderFunction
+  icon={{ children: (Component, props) => <Component {...props /> }}
+>
+Label
+</Button>
+```
+
+After:
+
+```tsx
+import * as React from 'React';
+import { type SlotRenderFunction } from '@fluentui/react-utilities';
+
+<Button
+  icon={{
+    // children is now `any` and needs to be asserted as `SlotRenderFunction`
+    children: ((Component, props) => <Component {...props} />) satisfies SlotRenderFunction<
+      React.ComponentProps<'span'>
+    >,
+  }}
+>
+  Label
+</Button>;
+```
diff --git a/apps/public-docsite-v9/src/Concepts/SupportedPlatforms.stories.mdx b/apps/public-docsite-v9/src/Concepts/SupportedPlatforms.stories.mdx
new file mode 100644
index 00000000000000..a78f01c8a93832
--- /dev/null
+++ b/apps/public-docsite-v9/src/Concepts/SupportedPlatforms.stories.mdx
@@ -0,0 +1,23 @@
+import { Meta } from '@storybook/addon-docs';
+
+<Meta title="Concepts/Developer/Supported Platforms" />
+
+# Supported Platforms
+
+Learn about the platforms that are supported by Fluent UI React.
+
+## Browser
+
+Fluent UI supports the latest, stable releases of all major browsers and platforms.
+
+Please refer to the [Browser Support Matrix](/docs/concepts-developer-browser-support-matrix--docs) for more details.
+
+## React
+
+Fluent UI fully supports React versions 17 and 18.
+
+Please refer to the [React Version Support](/docs/concepts-developer-react-version-support--docs) for more details.
+
+## TypeScript
+
+Fluent UI fully supports TypeScript versions >=3.9.

From 2c2da3197f0eef767fb99c10f83d8307dcecef85 Mon Sep 17 00:00:00 2001
From: Martin Hochel <martinhochel@microsoft.com>
Date: Thu, 12 Jun 2025 11:53:38 +0200
Subject: [PATCH 2/2] fixup! feat(docsite-v9): add official platform support
 docs including React Versions

---
 .../src/Concepts/ReactVersionSupport.stories.mdx                | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx b/apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx
index a52f16fb551ede..dd862d68f87323 100644
--- a/apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx
+++ b/apps/public-docsite-v9/src/Concepts/ReactVersionSupport.stories.mdx
@@ -16,7 +16,7 @@ Full support starting `@fluentui/react-components` v9.0.0.
 
 ## React 18
 
-Full support starting `@fluentui/react-components` v9.65.0.
+Full support starting `@fluentui/react-components` v9.66.0.
 
 ### Migration