Hooks

app/utils/isInternalUrl.js

@@ -0,0 +1,12 @@
+// @flow
+export default function isInternalUrl(href: string) {
+  if (href[0] === '/') return true;
+
+  try {
+    const outline = new URL(BASE_URL);
+    const parsed = new URL(href);
+    return parsed.hostname === outline.hostname;
+  } catch (err) {
+    return false;
+  }
+}