From 46a1eb9794e8fd5ffd8144a7fe2f6ebc7932d4cd Mon Sep 17 00:00:00 2001
From: Masafumi Koba <ybiquitous@gmail.com>
Date: Thu, 4 Apr 2019 16:47:03 +0900
Subject: [PATCH] [react-transition-group] Support optional `classNames` prop
 on `<CSSTransition/>`

Since v2.8.0, classNames prop has been optional.

See also:
- https://github.com/reactjs/react-transition-group/blob/v2.8.0/CHANGELOG.md
- https://github.com/reactjs/react-transition-group/pull/481
---
 types/react-transition-group/CSSTransition.d.ts               | 2 +-
 types/react-transition-group/index.d.ts                       | 2 +-
 types/react-transition-group/react-transition-group-tests.tsx | 4 ++++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/types/react-transition-group/CSSTransition.d.ts b/types/react-transition-group/CSSTransition.d.ts
index 16ba500270978b..8d48a48ce821e3 100644
--- a/types/react-transition-group/CSSTransition.d.ts
+++ b/types/react-transition-group/CSSTransition.d.ts
@@ -33,7 +33,7 @@ declare namespace CSSTransition {
      * ```
      */
     interface CSSTransitionProps extends TransitionProps {
-        classNames: string | CSSTransitionClassNames;
+        classNames?: string | CSSTransitionClassNames;
     }
 }
 
diff --git a/types/react-transition-group/index.d.ts b/types/react-transition-group/index.d.ts
index 2d97f64ce6beeb..de0e099b14f0a6 100644
--- a/types/react-transition-group/index.d.ts
+++ b/types/react-transition-group/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for react-transition-group 2.0
+// Type definitions for react-transition-group 2.8
 // Project: https://github.com/reactjs/react-transition-group
 // Definitions by: Karol Janyst <https://github.com/LKay>
 //                 Epskampie <https://github.com/Epskampie>
diff --git a/types/react-transition-group/react-transition-group-tests.tsx b/types/react-transition-group/react-transition-group-tests.tsx
index c7fb1aede02346..f568642a90082d 100644
--- a/types/react-transition-group/react-transition-group-tests.tsx
+++ b/types/react-transition-group/react-transition-group-tests.tsx
@@ -120,6 +120,10 @@ const Test: React.StatelessComponent = () => {
             >
                 <div>{ "test" }</div>
             </CSSTransition>
+
+            <CSSTransition timeout={ 100 }>
+                <div>{ "test" }</div>
+            </CSSTransition>
         </TransitionGroup>
     );
 };