[CHA-2354] Add ParsedPredefinedFilterResponse type

Add type definition for the new `predefined_filter` field returned in
QueryChannels responses when a predefined filter is used.

- Added ParsedPredefinedFilterResponse TypedDict
- Added unit tests for type definitions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: totalimmersion

stream_chat/tests/test_types.py

@@ -0,0 +1,67 @@
+"""Tests for type definitions."""
+
+from stream_chat.types.base import (
+    ParsedPredefinedFilterResponse,
+    SortOrder,
+    SortParam,
+)
+
+
+class TestParsedPredefinedFilterResponse:
+    """Tests for ParsedPredefinedFilterResponse type."""
+
+    def test_type_definition(self):
+        """Test that ParsedPredefinedFilterResponse can be used as a type hint."""
+        response: ParsedPredefinedFilterResponse = {
+            "name": "user_messaging",
+            "filter": {"type": "messaging", "members": {"$in": ["user123"]}},
+            "sort": [{"field": "last_message_at", "direction": SortOrder.DESC}],
+        }
+
+        assert response["name"] == "user_messaging"
+        assert response["filter"]["type"] == "messaging"
+        assert response["sort"][0]["field"] == "last_message_at"
+        assert response["sort"][0]["direction"] == SortOrder.DESC
+
+    def test_optional_sort(self):
+        """Test that sort is optional in ParsedPredefinedFilterResponse."""
+        response: ParsedPredefinedFilterResponse = {
+            "name": "simple_filter",
+            "filter": {"type": "messaging"},
+        }
+
+        assert response["name"] == "simple_filter"
+        assert "sort" not in response
+
+    def test_empty_filter(self):
+        """Test that filter can be empty dict."""
+        response: ParsedPredefinedFilterResponse = {
+            "name": "empty_filter",
+            "filter": {},
+        }
+
+        assert response["filter"] == {}
+
+
+class TestSortParam:
+    """Tests for SortParam type."""
+
+    def test_ascending_sort(self):
+        """Test ascending sort parameter."""
+        sort: SortParam = {
+            "field": "created_at",
+            "direction": SortOrder.ASC,
+        }
+
+        assert sort["field"] == "created_at"
+        assert sort["direction"] == 1
+
+    def test_descending_sort(self):
+        """Test descending sort parameter."""
+        sort: SortParam = {
+            "field": "last_message_at",
+            "direction": SortOrder.DESC,
+        }
+
+        assert sort["field"] == "last_message_at"
+        assert sort["direction"] == -1

stream_chat/types/base.py

@@ -1,6 +1,6 @@
 import sys
 from enum import IntEnum
-from typing import Optional
+from typing import Any, Dict, List, Optional
 
 if sys.version_info >= (3, 8):
     from typing import TypedDict
@@ -43,3 +43,20 @@ class Pager(TypedDict, total=False):
     limit: Optional[int]
     next: Optional[str]
     prev: Optional[str]
+
+
+class ParsedPredefinedFilterResponse(TypedDict, total=False):
+    """
+    Represents the parsed/interpolated predefined filter returned in QueryChannels response.
+
+    This is only present when a predefined filter is used in the query.
+
+    Parameters:
+        name: The name of the predefined filter that was used.
+        filter: The interpolated filter with placeholders replaced by actual values.
+        sort: The interpolated sort parameters (optional).
+    """
+
+    name: str
+    filter: Dict[str, Any]
+    sort: Optional[List[SortParam]]