don’t create browserHistory on the server

if you simply `require(‘react-router’)` on the
server you get an error, because the singleton
is actually created.

maybe we should export a memory history?

Author: ryanflorence

modules/browserHistory.js

@@ -1,4 +1,14 @@
 import useRouterHistory from './useRouterHistory'
 import createBrowserHistory from 'history/lib/createBrowserHistory'
 
-export default useRouterHistory(createBrowserHistory)()
+const canUseDOM = !!(
+  typeof window !== 'undefined' && window.document && window.document.createElement
+)
+
+let history
+
+if (canUseDOM) {
+  history = useRouterHistory(createBrowserHistory)()
+}
+
+export default history