Fix Crewai alias implementation to preserve type checking

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/crew.py

@@ -1,12 +1,24 @@
 import asyncio
 import json
 import re
+import sys
 import uuid
 import warnings
 from concurrent.futures import Future
 from copy import copy as shallow_copy
 from hashlib import md5
-from typing import Any, Callable, Dict, List, Optional, Set, Tuple, Union, cast
+from typing import (
+    Any,
+    Callable,
+    Dict,
+    List,
+    Optional,
+    Set,
+    Tuple,
+    TypeAlias,
+    Union,
+    cast,
+)
 
 from pydantic import (
     UUID4,
@@ -1384,3 +1396,19 @@ class Crew(BaseModel):
             memory_system.reset()
         except Exception as e:
             raise RuntimeError(f"Failed to reset {name} memory") from e
+
+
+class Crewai(Crew):
+    """Alias for Crew class to provide backward compatibility.
+    
+    This class inherits from Crew and provides the same functionality,
+    but emits a deprecation warning when used.
+    """
+    
+    def __new__(cls, *args, **kwargs):
+        warnings.warn(
+            "Crewai is deprecated, use Crew instead.",
+            DeprecationWarning,
+            stacklevel=2
+        )
+        return super().__new__(cls)

tests/test_crewai_alias.py

@@ -0,0 +1,57 @@
+import unittest
+
+
+class TestCrewaiAlias(unittest.TestCase):
+    """Tests validating the Crewai alias and its backward compatibility.
+    
+    These tests ensure that the Crewai alias works correctly for both
+    import scenarios and practical usage, providing backward compatibility
+    for existing code that uses the 'Crewai' name.
+    """
+
+    def test_crewai_alias_import(self):
+        """Test that Crewai can be imported from crewai.crew."""
+        try:
+            from crewai.crew import Crew, Crewai
+            
+            self.assertEqual(Crewai, Crew)
+        except ImportError:
+            self.fail("Failed to import Crewai from crewai.crew")
+    
+    def test_crewai_instance_creation(self):
+        """Ensure Crewai can be instantiated just like Crew."""
+        from crewai.agent import Agent
+        from crewai.crew import Crew, Crewai
+        
+        test_agent = Agent(
+            role="Test Agent",
+            goal="Testing",
+            backstory="Created for testing"
+        )
+        
+        crewai_instance = Crewai(agents=[test_agent], tasks=[])
+        crew_instance = Crew(agents=[test_agent], tasks=[])
+        
+        self.assertIsInstance(crewai_instance, Crew)
+        self.assertEqual(type(crewai_instance), type(crew_instance))
+    
+    def test_crewai_deprecation_warning(self):
+        """Test that using Crewai emits a deprecation warning."""
+        import importlib
+        import warnings
+
+        import crewai.crew
+        
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            importlib.reload(crewai.crew)
+            
+            self.assertTrue(len(w) > 0, "No deprecation warning was captured")
+            self.assertTrue(any(issubclass(warning.category, DeprecationWarning) for warning in w), 
+                           "No DeprecationWarning was found")
+            self.assertTrue(any("Crewai is deprecated" in str(warning.message) for warning in w),
+                           "Warning message doesn't contain expected text")
+
+
+if __name__ == "__main__":
+    unittest.main()