diff --git a/slowapi/__init__.py b/slowapi/__init__.py
index 4438295..85e9dbc 100644
--- a/slowapi/__init__.py
+++ b/slowapi/__init__.py
@@ -1 +1,6 @@
 from .extension import Limiter, _rate_limit_exceeded_handler
+
+__all__ = [
+    "Limiter",
+    "_rate_limit_exceeded_handler"
+]
diff --git a/slowapi/extension.py b/slowapi/extension.py
index 242b2c0..594273f 100644
--- a/slowapi/extension.py
+++ b/slowapi/extension.py
@@ -2,45 +2,36 @@
 The starlette extension to rate-limit requests
 """
 import asyncio
-from datetime import datetime, timedelta
 import functools
 import inspect
 import itertools
-import json
 import logging
-import sys
 import time
-import warnings
+from datetime import datetime
 from email.utils import formatdate, parsedate_to_datetime
 from functools import wraps
 from typing import (
     Any,
-    Awaitable,
     Callable,
     Dict,
     List,
     Optional,
     Set,
     Tuple,
-    Type,
     TypeVar,
     Union,
 )
 
 from limits import RateLimitItem  # type: ignore
 from limits.errors import ConfigurationError  # type: ignore
-from limits.storage import Storage  # type: ignore
 from limits.storage import MemoryStorage, storage_from_string
+from limits.storage import Storage  # type: ignore
 from limits.strategies import STRATEGIES, RateLimiter  # type: ignore
-from starlette.applications import Starlette
 from starlette.config import Config
-from starlette.exceptions import HTTPException
-from starlette.middleware.base import BaseHTTPMiddleware
 from starlette.requests import Request
 from starlette.responses import JSONResponse, Response
 
 from .errors import RateLimitExceeded
-from .util import get_ipaddr
 from .wrappers import Limit, LimitGroup
 
 # used to annotate get_app_config method
diff --git a/slowapi/middleware.py b/slowapi/middleware.py
index 894d3f1..451fed1 100644
--- a/slowapi/middleware.py
+++ b/slowapi/middleware.py
@@ -1,14 +1,11 @@
-from typing import Union
-
 from starlette.applications import Starlette
 from starlette.middleware.base import (
     BaseHTTPMiddleware,
     RequestResponseEndpoint,
-    DispatchFunction,
 )
 from starlette.requests import Request
 from starlette.responses import Response
-from starlette.routing import Route, BaseRoute, WebSocketRoute, Match
+from starlette.routing import Match
 
 from slowapi import Limiter, _rate_limit_exceeded_handler
 
diff --git a/tests/__init__.py b/tests/__init__.py
index 3fec7aa..b28ea52 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,17 +1,13 @@
 import logging
-import platform
-import unittest
-from functools import wraps
 
-import redis
 from fastapi import FastAPI
 from mock import mock  # type: ignore
 from starlette.applications import Starlette
 
 from slowapi.errors import RateLimitExceeded
 from slowapi.extension import Limiter, _rate_limit_exceeded_handler
-from slowapi.util import get_remote_address
 from slowapi.middleware import SlowAPIMiddleware
+from slowapi.util import get_remote_address
 
 
 class TestSlowapi:
diff --git a/tests/test_starlette_extension.py b/tests/test_starlette_extension.py
index b93d051..b36b9ad 100644
--- a/tests/test_starlette_extension.py
+++ b/tests/test_starlette_extension.py
@@ -1,10 +1,8 @@
 import time
 
 import hiro  # type: ignore
-from starlette.applications import Starlette
 from starlette.requests import Request
 from starlette.responses import PlainTextResponse
-from starlette.routing import Route
 from starlette.testclient import TestClient
 
 from slowapi.util import get_ipaddr, get_remote_address