feat(custom-widgets): complete Custom JSX v2 (#6390)

apps/docs/src/lib/utils.ts

@@ -9,3 +9,13 @@ export function cn(...inputs: ClassValue[]) {
 export function errorMessage(caught: unknown, fallback: string) {
   return caught instanceof Error ? caught.message : fallback;
 }
+
+export function oauthErrorMessage(caught: unknown) {
+  const message = errorMessage(caught, "GitHub sign-in failed");
+  if (/popup.*block|blocked.*popup/iu.test(message))
+    return "GitHub sign-in popup was blocked. Allow popups for this site and try again.";
+  if (/cancel|closed.*popup|popup.*closed/iu.test(message)) return "GitHub sign-in was cancelled before it completed.";
+  if (/provider|oauth|redirect|callback|client.?id/iu.test(message))
+    return "GitHub sign-in is not configured correctly on the Workshop server.";
+  return message;
+}