slackapi · WilliamBergamin · Mar 25, 2026 · Mar 25, 2026
@@ -44,8 +44,19 @@ jobs:
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: ${{ env.LATEST_SUPPORTED_PY }}
-      - name: Run mypy verification
-        run: ./scripts/run_mypy.sh
+      - name: Install synchronous dependencies
+        run: |
+          pip install -U pip
+          pip install -U .
+          pip install -r requirements/tools.txt
+      - name: Type check synchronous modules
+        run: mypy --config-file pyproject.toml --exclude "async_|/adapter/"
+      - name: Install async and adapter dependencies
+        run: |
+          pip install -r requirements/async.txt
+          pip install -r requirements/adapter.txt
+      - name: Type check all modules
+        run: mypy --config-file pyproject.toml
 
   unittest:
     name: Unit tests

@@ -1,25 +1,28 @@
 import logging
-from typing import Optional
+from typing import Optional, TYPE_CHECKING
 
 from aiohttp import web
 
 from slack_bolt.adapter.aiohttp import to_bolt_request, to_aiohttp_response
 from slack_bolt.response import BoltResponse
 from slack_bolt.util.utils import get_boot_message
 
+if TYPE_CHECKING:
+    from slack_bolt.app.async_app import AsyncApp
+
 
 class AsyncSlackAppServer:
     port: int
     path: str
     host: str
-    bolt_app: "AsyncApp"  # type: ignore[name-defined]
+    bolt_app: "AsyncApp"
     web_app: web.Application
 
     def __init__(
         self,
         port: int,
         path: str,
-        app: "AsyncApp",  # type: ignore[name-defined]
+        app: "AsyncApp",
         host: Optional[str] = None,
     ):
         """Standalone AIOHTTP Web Server.
@@ -34,7 +37,7 @@ def __init__(
         self.port = port
         self.path = path
         self.host = host if host is not None else "0.0.0.0"
-        self.bolt_app: "AsyncApp" = app  # type: ignore[name-defined]
+        self.bolt_app: "AsyncApp" = app
         self.web_app = web.Application()
         self._bolt_oauth_flow = self.bolt_app.oauth_flow
         if self._bolt_oauth_flow:

@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, TYPE_CHECKING
 
 from slack_sdk.web.async_client import AsyncWebClient
 
@@ -16,6 +16,9 @@
 from slack_bolt.context.set_title.async_set_title import AsyncSetTitle
 from slack_bolt.util.utils import create_copy
 
+if TYPE_CHECKING:
+    from slack_bolt.listener.asyncio_runner import AsyncioListenerRunner
+
 
 class AsyncBoltContext(BaseContext):
     """Context object associated with a request from Slack."""
@@ -42,7 +45,7 @@ def to_copyable(self) -> "AsyncBoltContext":
 
     # The return type is intentionally string to avoid circular imports
     @property
-    def listener_runner(self) -> "AsyncioListenerRunner":  # type: ignore[name-defined]
+    def listener_runner(self) -> "AsyncioListenerRunner":
         """The properly configured listener_runner that is available for middleware/listeners."""
         return self["listener_runner"]
 

@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, TYPE_CHECKING
 
 from slack_sdk import WebClient
 
@@ -16,6 +16,9 @@
 from slack_bolt.context.set_title import SetTitle
 from slack_bolt.util.utils import create_copy
 
+if TYPE_CHECKING:
+    from slack_bolt.listener.thread_runner import ThreadListenerRunner
+
 
 class BoltContext(BaseContext):
     """Context object associated with a request from Slack."""
@@ -43,7 +46,7 @@ def to_copyable(self) -> "BoltContext":
 
     # The return type is intentionally string to avoid circular imports
     @property
-    def listener_runner(self) -> "ThreadListenerRunner":  # type: ignore[name-defined]
+    def listener_runner(self) -> "ThreadListenerRunner":
         """The properly configured listener_runner that is available for middleware/listeners."""
         return self["listener_runner"]
 

@@ -48,9 +48,10 @@ async def handle(
         )
         returned_response = await self.func(**kwargs)
         if returned_response is not None and isinstance(returned_response, BoltResponse):
-            response.status = returned_response.status  # type: ignore[union-attr]
-            response.headers = returned_response.headers  # type: ignore[union-attr]
-            response.body = returned_response.body  # type: ignore[union-attr]
+            assert response is not None, "response must be provided when returning a BoltResponse from an error handler"
+            response.status = returned_response.status
+            response.headers = returned_response.headers
+            response.body = returned_response.body
 
 
 class AsyncDefaultListenerErrorHandler(AsyncListenerErrorHandler):

@@ -48,9 +48,10 @@ def handle(
         )
         returned_response = self.func(**kwargs)
         if returned_response is not None and isinstance(returned_response, BoltResponse):
-            response.status = returned_response.status  # type: ignore[union-attr]
-            response.headers = returned_response.headers  # type: ignore[union-attr]
-            response.body = returned_response.body  # type: ignore[union-attr]
+            assert response is not None, "response must be provided when returning a BoltResponse from an error handler"
+            response.status = returned_response.status
+            response.headers = returned_response.headers
+            response.body = returned_response.body
 
 
 class DefaultListenerErrorHandler(ListenerErrorHandler):

@@ -48,9 +48,10 @@ async def handle(
         )
         returned_response = await self.func(**kwargs)
         if returned_response is not None and isinstance(returned_response, BoltResponse):
-            response.status = returned_response.status  # type: ignore[union-attr]
-            response.headers = returned_response.headers  # type: ignore[union-attr]
-            response.body = returned_response.body  # type: ignore[union-attr]
+            assert response is not None, "response must be provided when returning a BoltResponse from an error handler"
+            response.status = returned_response.status
+            response.headers = returned_response.headers
+            response.body = returned_response.body
 
 
 class AsyncDefaultMiddlewareErrorHandler(AsyncMiddlewareErrorHandler):

@@ -48,9 +48,10 @@ def handle(
         )
         returned_response = self.func(**kwargs)
         if returned_response is not None and isinstance(returned_response, BoltResponse):
-            response.status = returned_response.status  # type: ignore[union-attr]
-            response.headers = returned_response.headers  # type: ignore[union-attr]
-            response.body = returned_response.body  # type: ignore[union-attr]
+            assert response is not None, "response must be provided when returning a BoltResponse from an error handler"
+            response.status = returned_response.status
+            response.headers = returned_response.headers
+            response.body = returned_response.body
 
 
 class DefaultMiddlewareErrorHandler(MiddlewareErrorHandler):

@@ -1,6 +1,6 @@
 import logging
 from logging import Logger
-from typing import Optional, Callable, Awaitable
+from typing import Optional, Callable, Awaitable, TYPE_CHECKING
 
 from slack_sdk.oauth import RedirectUriPageRenderer, OAuthStateUtils
 from slack_sdk.oauth.installation_store import Installation
@@ -9,14 +9,17 @@
 from slack_bolt.request.async_request import AsyncBoltRequest
 from slack_bolt.response import BoltResponse
 
+if TYPE_CHECKING:
+    from slack_bolt.oauth.async_oauth_settings import AsyncOAuthSettings
+
 
 class AsyncSuccessArgs:
     def __init__(
         self,
         *,
         request: AsyncBoltRequest,
         installation: Installation,
-        settings: "AsyncOAuthSettings",  # type: ignore[name-defined]
+        settings: "AsyncOAuthSettings",
         default: "AsyncCallbackOptions",
     ):
         """The arguments for a success function.
@@ -41,7 +44,7 @@ def __init__(
         reason: str,
         error: Optional[Exception] = None,
         suggested_status_code: int,
-        settings: "AsyncOAuthSettings",  # type: ignore[name-defined]
+        settings: "AsyncOAuthSettings",
         default: "AsyncCallbackOptions",
     ):
         """The arguments for a failure function.

@@ -1,6 +1,6 @@
 import logging
 from logging import Logger
-from typing import Optional, Callable
+from typing import Optional, Callable, TYPE_CHECKING
 
 from slack_sdk.oauth import RedirectUriPageRenderer, OAuthStateUtils
 from slack_sdk.oauth.installation_store import Installation
@@ -9,14 +9,17 @@
 from slack_bolt.request import BoltRequest
 from slack_bolt.response import BoltResponse
 
+if TYPE_CHECKING:
+    from slack_bolt.oauth.oauth_settings import OAuthSettings
+
 
 class SuccessArgs:
     def __init__(
         self,
         *,
         request: BoltRequest,
         installation: Installation,
-        settings: "OAuthSettings",  # type: ignore[name-defined]
+        settings: "OAuthSettings",
         default: "CallbackOptions",
     ):
         """The arguments for a success function.
@@ -41,7 +44,7 @@ def __init__(
         reason: str,
         error: Optional[Exception] = None,
         suggested_status_code: int,
-        settings: "OAuthSettings",  # type: ignore[name-defined]
+        settings: "OAuthSettings",
         default: "CallbackOptions",
     ):
         """The arguments for a failure function.