[FSSDK-13300] Remove dead Python 3.7 typing guards (#526)

* [FSSDK-13300] Remove dead Python 3.7 typing guards and pin mypy

mypy 2.4.0 rejects the `if version_info < (3, 8)` conditional Protocol
imports, failing type-check on every PR. Those branches only run on
Python 3.7, which has been unsupported since 5.0, so import Final,
Literal, Protocol and TypedDict directly from typing. Drop the mypy.ini
unused-ignore override that existed only for the old TypedDict import,
and pin mypy~=2.4.0 so new mypy releases can't break CI unannounced.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* [FSSDK-13300] Leave mypy unpinned

Keep requirements/typing.txt as on master. The typing import cleanup
alone fixes the mypy 2.4.0 failure.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: FarhanAnjum-opti

mypy.ini

@@ -9,7 +9,3 @@ exclude = (?x)(
   )
 show_error_codes = True
 pretty = True
-
-# suppress error on conditional import of typing_extensions module
-[mypy-optimizely.helpers.types]
-no_warn_unused_ignores = True

optimizely/bucketer.py

@@ -12,19 +12,12 @@
 # limitations under the License.
 
 from __future__ import annotations
-from typing import Optional, TYPE_CHECKING, cast
+from typing import Optional, TYPE_CHECKING, cast, Final
 import math
-from sys import version_info
 
 from .lib import pymmh3 as mmh3
 
 
-if version_info < (3, 8):
-    from typing_extensions import Final
-else:
-    from typing import Final
-
-
 if TYPE_CHECKING:
     # prevent circular dependenacy by skipping import at runtime
     from .project_config import ProjectConfig

optimizely/decision/optimizely_decide_option.py

@@ -11,12 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from sys import version_info
-
-if version_info < (3, 8):
-    from typing_extensions import Final
-else:
-    from typing import Final
+from typing import Final
 
 
 class OptimizelyDecideOption:

optimizely/decision/optimizely_decision_message.py

@@ -11,12 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from sys import version_info
-
-if version_info < (3, 8):
-    from typing_extensions import Final
-else:
-    from typing import Final
+from typing import Final
 
 
 class OptimizelyDecisionMessage:

optimizely/entities.py

@@ -11,13 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 from __future__ import annotations
-from typing import TYPE_CHECKING, Any, Optional, Sequence
-from sys import version_info
-
-if version_info < (3, 8):
-    from typing_extensions import Final
-else:
-    from typing import Final
+from typing import TYPE_CHECKING, Any, Optional, Sequence, Final
 
 
 if TYPE_CHECKING:

optimizely/event/event_factory.py

@@ -12,8 +12,7 @@
 # limitations under the License.
 
 from __future__ import annotations
-from typing import TYPE_CHECKING, Optional, Sequence, cast, List
-from sys import version_info
+from typing import TYPE_CHECKING, Optional, Sequence, cast, List, Final
 from optimizely import entities
 from optimizely.helpers import enums
 from optimizely.helpers import event_tag_utils
@@ -23,11 +22,6 @@
 from . import payload
 from . import user_event
 
-if version_info < (3, 8):
-    from typing_extensions import Final
-else:
-    from typing import Final
-
 if TYPE_CHECKING:
     # prevent circular dependenacy by skipping import at runtime
     from optimizely.project_config import ProjectConfig

optimizely/event/event_processor.py

@@ -17,10 +17,9 @@
 import threading
 import time
 
-from typing import Optional
+from typing import Optional, Final
 from datetime import timedelta
 import queue
-from sys import version_info
 
 from optimizely import logger as _logging
 from optimizely import notification_center as _notification_center
@@ -31,12 +30,6 @@
 from .user_event import UserEvent
 
 
-if version_info < (3, 8):
-    from typing_extensions import Final
-else:
-    from typing import Final
-
-
 class BaseEventProcessor(ABC):
     """ Class encapsulating event processing. Override with your own implementation. """
 

optimizely/event/log_event.py

@@ -12,17 +12,10 @@
 # limitations under the License.
 
 from __future__ import annotations
-from typing import Optional, Any
-from sys import version_info
+from typing import Optional, Any, Literal
 from optimizely import event_builder
 
 
-if version_info < (3, 8):
-    from typing_extensions import Literal
-else:
-    from typing import Literal
-
-
 class LogEvent(event_builder.Event):
     """ Representation of an event which can be sent to Optimizely events API. """
 

optimizely/event/user_event.py

@@ -13,18 +13,11 @@
 from __future__ import annotations
 import time
 import uuid
-from typing import TYPE_CHECKING, Optional
-from sys import version_info
+from typing import TYPE_CHECKING, Optional, Final
 
 from optimizely import version
 
 
-if version_info < (3, 8):
-    from typing_extensions import Final
-else:
-    from typing import Final
-
-
 if TYPE_CHECKING:
     # prevent circular dependenacy by skipping import at runtime
     from optimizely.entities import Experiment, Variation, Event, Holdout

optimizely/event_builder.py

@@ -13,21 +13,15 @@
 
 from __future__ import annotations
 import time
-from typing import TYPE_CHECKING, Any, Optional
+from typing import TYPE_CHECKING, Any, Optional, Final, Literal
 import uuid
-from sys import version_info
 
 from . import version
 from .event import event_id_normalizer
 from .helpers import enums
 from .helpers import event_tag_utils
 from .helpers import validator
 
-if version_info < (3, 8):
-    from typing_extensions import Final, Literal
-else:
-    from typing import Final, Literal
-
 if TYPE_CHECKING:
     # prevent circular dependenacy by skipping import at runtime
     from .entities import Experiment