Fixes Pyright type errors

CHANGES.rst

@@ -6,6 +6,8 @@ Version 3.1.0
 -   ``Flask.open_resource``/``open_instance_resource`` and
     ``Blueprint.open_resource`` take an ``encoding`` parameter to use when
     opening in text mode. It defaults to ``utf-8``. :issue:`5504`
+-   Fixes Pyright type errors. :issue:`5549`
+
 
 Version 3.0.3
 -------------

src/flask/app.py

@@ -349,7 +349,7 @@ class Flask(App):
         path = os.path.join(self.root_path, resource)
 
         if mode == "rb":
-            return open(path, mode)
+            return open(path, mode)  # pyright: ignore
 
         return open(path, mode, encoding=encoding)
 
@@ -1163,7 +1163,10 @@ class Flask(App):
            response object.
         """
 
-        status = headers = None
+        status: int | None = None
+        headers: (
+            Headers | dict[t.Any, t.Any] | tuple[t.Any, ...] | list[t.Any] | None
+        ) = None
 
         # unpack tuple returns
         if isinstance(rv, tuple):
@@ -1171,11 +1174,11 @@ class Flask(App):
 
             # a 3-tuple is unpacked directly
             if len_rv == 3:
-                rv, status, headers = rv  # type: ignore[misc]
+                rv, status, headers = rv  # type: ignore[assignment, misc]
             # decide if a 2-tuple has status or headers
             elif len_rv == 2:
                 if isinstance(rv[1], (Headers, dict, tuple, list)):
-                    rv, headers = rv
+                    rv, headers = rv  # type: ignore
                 else:
                     rv, status = rv  # type: ignore[assignment,misc]
             # other sized tuples are not allowed
@@ -1203,7 +1206,7 @@ class Flask(App):
                 rv = self.response_class(
                     rv,
                     status=status,
-                    headers=headers,  # type: ignore[arg-type]
+                    headers=headers,
                 )
                 status = headers = None
             elif isinstance(rv, (dict, list)):
@@ -1243,7 +1246,7 @@ class Flask(App):
 
         # extend existing headers with provided headers
         if headers:
-            rv.headers.update(headers)  # type: ignore[arg-type]
+            rv.headers.update(headers)
 
         return rv
 

src/flask/blueprints.py

@@ -123,6 +123,6 @@ class Blueprint(SansioBlueprint):
         path = os.path.join(self.root_path, resource)
 
         if mode == "rb":
-            return open(path, mode)
+            return open(path, mode)  # pyright: ignore
 
         return open(path, mode, encoding=encoding)

src/flask/cli.py

@@ -323,9 +323,9 @@ class ScriptInfo:
         """
         if self._loaded_app is not None:
             return self._loaded_app
-
+        app: Flask | None = None
         if self.create_app is not None:
-            app: Flask | None = self.create_app()
+            app = self.create_app()
         else:
             if self.app_import_path:
                 path, name = (
@@ -549,7 +549,7 @@ class FlaskGroup(AppGroup):
         set_debug_flag: bool = True,
         **extra: t.Any,
     ) -> None:
-        params = list(extra.pop("params", None) or ())
+        params: list[t.Any] = list(extra.pop("params", None) or ())
         # Processing is done with option callbacks instead of a group
         # callback. This allows users to make a custom group callback
         # without losing the behavior. --env-file must come first so
@@ -587,7 +587,7 @@ class FlaskGroup(AppGroup):
             # Use a backport on Python < 3.10. We technically have
             # importlib.metadata on 3.8+, but the API changed in 3.10,
             # so use the backport for consistency.
-            import importlib_metadata as metadata
+            import importlib_metadata as metadata  # pyright: ignore
 
         for ep in metadata.entry_points(group="flask.commands"):
             self.add_command(ep.load(), ep.name)
@@ -934,7 +934,7 @@ def run_command(
     option.
     """
     try:
-        app: WSGIApplication = info.load_app()
+        app: WSGIApplication = info.load_app()  # pyright: ignore
     except Exception as e:
         if is_running_from_reloader():
             # When reloading, print out the error immediately, but raise

src/flask/helpers.py

@@ -587,7 +587,7 @@ def get_root_path(import_name: str) -> str:
         return os.getcwd()
 
     if hasattr(loader, "get_filename"):
-        filepath = loader.get_filename(import_name)
+        filepath = loader.get_filename(import_name)  # pyright: ignore
     else:
         # Fall back to imports.
         __import__(import_name)

src/flask/testing.py

@@ -79,6 +79,10 @@ class EnvironBuilder(werkzeug.test.EnvironBuilder):
             path = url.path
 
             if url.query:
+                # NOTE:
+                # If `path` in func args is `str`, then `url.query` will
+                # never be a `bytes` Should we adjust `path`? Should we
+                # adjust this statement here?
                 sep = b"?" if isinstance(url.query, bytes) else "?"
                 path += sep + url.query
 

src/flask/views.py

@@ -61,7 +61,7 @@ class View:
     #: decorator.
     #:
     #: .. versionadded:: 0.8
-    decorators: t.ClassVar[list[t.Callable[[F], F]]] = []
+    decorators: t.ClassVar[list[t.Callable[..., t.Any]]] = []
 
     #: Create a new instance of this view class for every request by
     #: default. If a view subclass sets this to ``False``, the same
@@ -110,7 +110,7 @@ class View:
                 return current_app.ensure_sync(self.dispatch_request)(**kwargs)  # type: ignore[no-any-return]
 
         else:
-            self = cls(*class_args, **class_kwargs)
+            self = cls(*class_args, **class_kwargs)  # pyright: ignore
 
             def view(**kwargs: t.Any) -> ft.ResponseReturnValue:
                 return current_app.ensure_sync(self.dispatch_request)(**kwargs)  # type: ignore[no-any-return]

src/flask/wrappers.py

@@ -129,11 +129,11 @@ class Request(RequestBase):
     def on_json_loading_failed(self, e: ValueError | None) -> t.Any:
         try:
             return super().on_json_loading_failed(e)
-        except BadRequest as e:
+        except BadRequest as e_badreq:
             if current_app and current_app.debug:
                 raise
 
-            raise BadRequest() from e
+            raise BadRequest() from e_badreq
 
 
 class Response(ResponseBase):