--wip-- [skip ci]

Author: MOZGIII

.vscode/settings.json

@@ -3,5 +3,6 @@
   "rust-analyzer.cargo.target": "wasm32-unknown-unknown",
   "rust-analyzer.check.targets": ["wasm32-unknown-unknown"],
   "rust-analyzer.check.command": "clippy",
-  "rust-analyzer.cargo.features": "all"
+  "rust-analyzer.cargo.features": "all",
+  "rust-analyzer.cargo.targetDir": true
 }

crates/xwt-web-sys/src/lib.rs

@@ -471,3 +471,16 @@ impl Drop for Session {
         self.transport.close();
     }
 }
+
+impl xwt_core::stream::AsErrorCode for Error {
+    type ErrorCode = StreamErrorCode;
+
+    fn as_error_code(&self) -> Option<Self::ErrorCode> {
+        let error: &WebTransportError = self.0.dyn_ref()?;
+        if error.source() != WebTransportErrorSource::Stream {
+            return None;
+        }
+        let code = error.stream_error_code().unwrap_or(0);
+        Some(StreamErrorCode(code.into()))
+    }
+}