fix(WebSocket): no panic on failed connect + handle promise rejection via error event (#7437)

1 files changed, 8 insertions, 0 deletions

diff --git a/cli/rt/27_websocket.js b/cli/rt/27_websocket.js
index 0b113ebca..fdb5333e3 100644
--- a/cli/rt/27_websocket.js
+++ b/cli/rt/27_websocket.js
@@ -100,6 +100,14 @@
           this.onclose?.(closeEvent);
           this.dispatchEvent(closeEvent);
         }
+      }).catch((err) => {
+        const event = new ErrorEvent(
+          "error",
+          { error: err, message: err.toString() },
+        );
+        event.target = this;
+        this.onerror?.(event);
+        this.dispatchEvent(event);
       });
     }