diff --git a/third_party/2and3/flask/app.pyi b/third_party/2and3/flask/app.pyi
index 0e8519c04..e4fb038a8 100644
--- a/third_party/2and3/flask/app.pyi
+++ b/third_party/2and3/flask/app.pyi
@@ -13,7 +13,8 @@ from .signals import appcontext_tearing_down, got_request_exception, request_fin
 from .templating import DispatchingJinjaLoader, Environment
 from .wrappers import Request, Response
 from .testing import FlaskClient
-from typing import Any, Callable, ContextManager, Dict, List, Optional, Type, TypeVar, Union
+from typing import Any, Callable, ContextManager, Dict, List, Optional, Type, TypeVar, Union, Text
+from datetime import timedelta
 
 def setupmethod(f: Any): ...
 
@@ -26,10 +27,10 @@ class Flask(_PackageBoundObject):
     app_ctx_globals_class: type = ...
     config_class: Type[Config] = ...
     testing: Any = ...
-    secret_key: Any = ...
+    secret_key: Union[Text, bytes, None] = ...
     session_cookie_name: Any = ...
-    permanent_session_lifetime: Any = ...
-    send_file_max_age_default: Any = ...
+    permanent_session_lifetime: timedelta = ...
+    send_file_max_age_default: timedelta = ...
     use_x_sendfile: Any = ...
     json_encoder: Any = ...
     json_decoder: Any = ...
@@ -41,10 +42,10 @@ class Flask(_PackageBoundObject):
     session_interface: Any = ...
     import_name: str = ...
     template_folder: str = ...
-    root_path: Any = ...
+    root_path: Optional[Union[str, Text]] = ...
     static_url_path: Any = ...
-    static_folder: str = ...
-    instance_path: Any = ...
+    static_folder: Optional[str] = ...
+    instance_path: Union[str, Text] = ...
     config: Config = ...
     view_functions: Any = ...
     error_handler_spec: Any = ...
@@ -63,11 +64,11 @@ class Flask(_PackageBoundObject):
     url_map: Any = ...
     subdomain_matching: Any = ...
     cli: Any = ...
-    def __init__(self, import_name: str, static_url_path: Optional[str] = ..., static_folder: str = ..., static_host: Optional[str] = ..., host_matching: bool = ..., subdomain_matching: bool = ..., template_folder: str = ..., instance_path: Optional[str] = ..., instance_relative_config: bool = ..., root_path: Optional[str] = ...) -> None: ...
+    def __init__(self, import_name: str, static_url_path: Optional[str] = ..., static_folder: Optional[str] = ..., static_host: Optional[str] = ..., host_matching: bool = ..., subdomain_matching: bool = ..., template_folder: str = ..., instance_path: Optional[str] = ..., instance_relative_config: bool = ..., root_path: Optional[str] = ...) -> None: ...
     @property
     def name(self) -> str: ...
     @property
-    def propagate_exceptions(self): ...
+    def propagate_exceptions(self) -> bool: ...
     @property
     def preserve_context_on_exception(self): ...
     @property
@@ -75,18 +76,18 @@ class Flask(_PackageBoundObject):
     @property
     def jinja_env(self): ...
     @property
-    def got_first_request(self): ...
+    def got_first_request(self) -> bool: ...
     def make_config(self, instance_relative: bool = ...): ...
     def auto_find_instance_path(self): ...
-    def open_instance_resource(self, resource: Any, mode: str = ...): ...
+    def open_instance_resource(self, resource: Union[str, Text], mode: str = ...): ...
     templates_auto_reload: Any = ...
     def create_jinja_environment(self): ...
     def create_global_jinja_loader(self): ...
     def select_jinja_autoescape(self, filename: Any): ...
     def update_template_context(self, context: Any) -> None: ...
     def make_shell_context(self): ...
-    env: Any = ...
-    debug: Any = ...
+    env: Optional[str] = ...
+    debug: bool = ...
     def run(self, host: Optional[str] = ..., port: Optional[int] = ..., debug: Optional[bool] = ..., load_dotenv: bool = ..., **options: Any) -> None: ...
     def test_client(self, use_cookies: bool = ..., **kwargs: Any) -> FlaskClient: ...
     def test_cli_runner(self, **kwargs: Any): ...