Migrate is{Headless,Production}

Summary: _typescript_

Reviewed By: jknoxville

Differential Revision: D16711115

fbshipit-source-id: 174e1d3057182c35a6e3493612ddcb3d6ba1ee54

src/utils/isHeadless.tsx

@@ -0,0 +1,10 @@
+/**
+ * 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
+ */
+
+export default function isHeadless(): boolean {
+  return typeof global.window === 'undefined';
+}