fix(urlpattern): fallback to empty string for undefined group values (#25151)

This change was introduced in #24741, but due to the change in
behaviour, we will revert it and re-introduce it in 2.0

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/unit/urlpattern_test.ts b/tests/unit/urlpattern_test.ts
index 3c1fb0cf1..65c224173 100644
--- a/tests/unit/urlpattern_test.ts
+++ b/tests/unit/urlpattern_test.ts
@@ -63,3 +63,9 @@ Deno.test(function urlPatternWithPrototypePollution() {
     RegExp.prototype.exec = originalExec;
   }
 });
+
+Deno.test(function urlPatternEmptyFallback() {
+  const p = new URLPattern({ pathname: "/foo/bar{/:qaz}?" });
+  const match = p.exec("https://example.com/foo/bar");
+  assertEquals(match!.pathname.groups.qaz, "");
+});