fix(repl): don't panic on undefined exception (#18888)

Fixes regression from #18878 where `Promise.reject()`,
`Promise.reject(undefined)` and `reportError(undefined)` panic in the
REPL.
Fixes `throw undefined` printing `Uncaught Unknown exception` instead of
`Uncaught undefined`.

1 files changed, 14 insertions, 0 deletions

diff --git a/cli/tests/integration/repl_tests.rs b/cli/tests/integration/repl_tests.rs
index d9966fe8f..f8987e20b 100644
--- a/cli/tests/integration/repl_tests.rs
+++ b/cli/tests/integration/repl_tests.rs
@@ -825,6 +825,20 @@ fn repl_report_error() {
 }
 
 #[test]
+fn repl_error_undefined() {
+  util::with_pty(&["repl"], |mut console| {
+    console.write_line(r#"throw undefined;"#);
+    console.expect("Uncaught undefined");
+    console.write_line(r#"Promise.reject();"#);
+    console.expect("Promise { <rejected> undefined }");
+    console.expect("Uncaught (in promise) undefined");
+    console.write_line(r#"reportError(undefined);"#);
+    console.expect("undefined");
+    console.expect("Uncaught undefined");
+  });
+}
+
+#[test]
 fn pty_aggregate_error() {
   util::with_pty(&["repl"], |mut console| {
     console.write_line("await Promise.any([])");