From 4bf7415a9692b0c1a69cd50a17c1cbda4a75931b Mon Sep 17 00:00:00 2001
From: Matthijs van der Vleuten <git@zr40.nl>
Date: Thu, 14 Jul 2022 11:22:22 +0200
Subject: [PATCH] allow TypedDict as a response value

---
 CHANGES.rst                  |  2 ++
 src/flask/typing.py          |  3 ++-
 tests/typing/typing_route.py | 11 +++++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index 018c680d..95a004d7 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -91,6 +91,8 @@ Unreleased
 
 -   Allow returning a list from a view function, to convert it to a
     JSON response like a dict is. :issue:`4672`
+-   When type checking, allow ``TypedDict`` to be returned from view
+    functions. :pr:`4695`
 
 
 Version 2.1.3
diff --git a/src/flask/typing.py b/src/flask/typing.py
index 89bdc71e..8857598e 100644
--- a/src/flask/typing.py
+++ b/src/flask/typing.py
@@ -11,7 +11,8 @@ ResponseValue = t.Union[
     str,
     bytes,
     t.List[t.Any],
-    t.Dict[str, t.Any],
+    # Only dict is actually accepted, but Mapping allows for TypedDict.
+    t.Mapping[str, t.Any],
     t.Iterator[str],
     t.Iterator[bytes],
 ]
diff --git a/tests/typing/typing_route.py b/tests/typing/typing_route.py
index 5f2ddbfd..566280c0 100644
--- a/tests/typing/typing_route.py
+++ b/tests/typing/typing_route.py
@@ -3,6 +3,8 @@ from __future__ import annotations
 import typing as t
 from http import HTTPStatus
 
+import typing_extensions as te
+
 from flask import Flask
 from flask import jsonify
 from flask import stream_template
@@ -38,6 +40,15 @@ def hello_json_list() -> t.List[t.Any]:
     return [{"message": "Hello"}, {"message": "World"}]
 
 
+class StatusJSON(te.TypedDict):
+    status: str
+
+
+@app.route("/typed-dict")
+def typed_dict() -> StatusJSON:
+    return {"status": "ok"}
+
+
 @app.route("/generator")
 def hello_generator() -> t.Generator[str, None, None]:
     def show() -> t.Generator[str, None, None]: