Add test

types/react-router-dom/react-router-dom-tests.tsx

@@ -0,0 +1,21 @@
+import * as React from 'react';
+import {
+  NavLink,
+  NavLinkProps,
+  match
+} from 'react-router-dom';
+import * as H from 'history';
+
+const getIsActive = (extraProp: string) => (match: match<any>, location: H.Location) => !!extraProp;
+
+interface Props extends NavLinkProps {
+  extraProp: string;
+}
+
+export default function(props: Props) {
+  const {extraProp, ...rest} = props;
+  const isActive = getIsActive(extraProp);
+  return (
+    <NavLink {...rest} isActive={isActive}/>
+  );
+}

types/react-router-dom/tsconfig.json

@@ -13,6 +13,7 @@
     "noEmit": true
   },
   "files": [
-    "index.d.ts"
+    "index.d.ts",
+    "react-router-dom-tests.tsx"
   ]
 }