diff --git a/src/ui/components/Tab.tsx b/src/ui/components/Tab.tsx
index e48685bad..8bd3157c9 100644
--- a/src/ui/components/Tab.tsx
+++ b/src/ui/components/Tab.tsx
@@ -38,6 +38,6 @@ export type Props = {
   width?: WidthProperty<number>;
 };
 
-export default function Tab(_props: Props) {
+export default function Tab(_props: Props): JSX.Element {
   throw new Error("don't render me");
 }
diff --git a/types/react-virtualized.d.tsx b/types/react-virtualized.d.tsx
new file mode 100644
index 000000000..9a7c90bea
--- /dev/null
+++ b/types/react-virtualized.d.tsx
@@ -0,0 +1,11 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+declare module 'react-virtualized' {
+  const AutoSizer: any;
+  const Collection: any;
+}