From e2e5298c1f2d2ea96fba2413b5bbe767f11c01f6 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
Date: Tue, 7 May 2019 20:12:47 -0700
Subject: [PATCH] Avoid extends check for React.memo and React.lazy (#35272)

This is extremely expensive. Doesn't address the underlying issue that
ComponentProps and PropsWithRef are extremely expensive.
---
 types/react/index.d.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/types/react/index.d.ts b/types/react/index.d.ts
index ed0c1d90ce..c018d39290 100644
--- a/types/react/index.d.ts
+++ b/types/react/index.d.ts
@@ -777,9 +777,9 @@ declare namespace React {
 
     // will show `Memo(${Component.displayName || Component.name})` in devtools by default,
     // but can be given its own specific name
-    interface MemoExoticComponent<T extends ComponentType<any>> extends NamedExoticComponent<ComponentPropsWithRef<T>> {
+    type MemoExoticComponent<T extends ComponentType<any>> = NamedExoticComponent<ComponentPropsWithRef<T>> & {
         readonly type: T;
-    }
+    };
 
     function memo<P extends object>(
         Component: SFC<P>,
@@ -790,9 +790,9 @@ declare namespace React {
         propsAreEqual?: (prevProps: Readonly<ComponentProps<T>>, nextProps: Readonly<ComponentProps<T>>) => boolean
     ): MemoExoticComponent<T>;
 
-    interface LazyExoticComponent<T extends ComponentType<any>> extends ExoticComponent<ComponentPropsWithRef<T>> {
+    type LazyExoticComponent<T extends ComponentType<any>> = ExoticComponent<ComponentPropsWithRef<T>> & {
         readonly _result: T;
-    }
+    };
 
     function lazy<T extends ComponentType<any>>(
         factory: () => Promise<{ default: T }>