Make h2.events more typing-friendly

CHANGELOG.rst

@@ -8,6 +8,11 @@ dev
 
 -
 
+**API Changes (Backward Compatible)**
+
+- h2 events now have tighter type bounds, e.g. `stream_id` is guaranteed to not be `None` for most events now.
+  This simplifies downstream type checking.
+
 **Bugfixes**
 
 -

src/h2/connection.py

@@ -1806,9 +1806,7 @@ def _receive_window_update_frame(self, frame: WindowUpdateFrame) -> tuple[list[F
             )
 
             # FIXME: Should we split this into one event per active stream?
-            window_updated_event = WindowUpdated()
-            window_updated_event.stream_id = 0
-            window_updated_event.delta = frame.window_increment
+            window_updated_event = WindowUpdated(stream_id=0, delta=frame.window_increment)
             stream_events = [window_updated_event]
             frames = []
 
@@ -1825,17 +1823,16 @@ def _receive_ping_frame(self, frame: PingFrame) -> tuple[list[Frame], list[Event
 
         evt: PingReceived | PingAckReceived
         if "ACK" in frame.flags:
-            evt = PingAckReceived()
+            evt = PingAckReceived(ping_data=frame.opaque_data)
         else:
-            evt = PingReceived()
+            evt = PingReceived(ping_data=frame.opaque_data)
 
             # automatically ACK the PING with the same 'opaque data'
             f = PingFrame(0)
             f.flags.add("ACK")
             f.opaque_data = frame.opaque_data
             frames.append(f)
 
-        evt.ping_data = frame.opaque_data
         events.append(evt)
 
         return frames, events
@@ -1974,8 +1971,7 @@ def _receive_unknown_frame(self, frame: ExtensionFrame) -> tuple[list[Frame], li
         self.config.logger.debug(
             "Received unknown extension frame (ID %d)", frame.stream_id,
         )
-        event = UnknownFrameReceived()
-        event.frame = frame
+        event = UnknownFrameReceived(frame=frame)
         return [], [event]
 
     def _local_settings_acked(self) -> dict[SettingCodes | int, ChangedSetting]: