Taken from Gentoo, which adapted
https://github.com/agronholm/typeguard/commit/e0db07a777d5a481eaba6162354adf32286ce21b

diff --git a/src/typeguard/__init__.py b/src/typeguard/__init__.py
index 5684d63..27fa30b 100644
--- a/src/typeguard/__init__.py
+++ b/src/typeguard/__init__.py
@@ -61,22 +61,25 @@ except ImportError:
     from typing import _ForwardRef as ForwardRef
     evaluate_forwardref = ForwardRef._eval_type
 
-if sys.version_info >= (3, 10):
-    from typing import is_typeddict
-else:
-    _typed_dict_meta_types = ()
-    if sys.version_info >= (3, 8):
-        from typing import _TypedDictMeta
-        _typed_dict_meta_types += (_TypedDictMeta,)
+try:
+    from typing_extensions import is_typeddict
+except ImportError:
+    if sys.version_info >= (3, 10):
+        from typing import is_typeddict
+    else:
+        _typed_dict_meta_types = ()
+        if sys.version_info >= (3, 8):
+            from typing import _TypedDictMeta
+            _typed_dict_meta_types += (_TypedDictMeta,)
 
-    try:
-        from typing_extensions import _TypedDictMeta
-        _typed_dict_meta_types += (_TypedDictMeta,)
-    except ImportError:
-        pass
+        try:
+            from typing_extensions import _TypedDictMeta
+            _typed_dict_meta_types += (_TypedDictMeta,)
+        except ImportError:
+            pass
 
-    def is_typeddict(tp) -> bool:
-        return isinstance(tp, _typed_dict_meta_types)
+        def is_typeddict(tp) -> bool:
+            return isinstance(tp, _typed_dict_meta_types)
 
 
 if TYPE_CHECKING:
='right' method='get' action='/guix/log/build-aux/update-NEWS.scm'>
<input type='hidden' name='id' value='74b012310f22836db05cd63d9ac2d88c1d4b9efe'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=74b012310f22836db05cd63d9ac2d88c1d4b9efe'>root</a>/<a href='/guix/log/build-aux?id=74b012310f22836db05cd63d9ac2d88c1d4b9efe'>build-aux</a>/<a href='/guix/log/build-aux/update-NEWS.scm?id=74b012310f22836db05cd63d9ac2d88c1d4b9efe'>update-NEWS.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/update-NEWS.scm?id=74b012310f22836db05cd63d9ac2d88c1d4b9efe&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-05-10 13:48:02 -0400'>2021-05-10</span></td><td><a href='/guix/commit/build-aux/update-NEWS.scm?id=ed2d4d52dde00bdccc1bb2c93b24ffcc72a7fcd3'>maint: update-NEWS: Sort packages prior writing to the data file.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/update-NEWS.scm (main): Sort packages.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-04-23 21:32:46 -0400'>2021-04-23</span></td><td><a href='/guix/commit/build-aux/update-NEWS.scm?id=18dc8c6f0f76b8d128638105eebad2895f9857f0'>build-aux: Relax the regexp used to match NEWS sections.</a><span class='msg-avail'>...<span class='msg-tooltip'>A number of packages doesn't really make sense in the name of the section to
be substituted.  This change allows using simply '*** new packages' instead of
'*** 1999 new packages', for example, and have the update-NEWS.scm script
update it.

* build-aux/update-NEWS.scm (write-packages-added) &lt;regexp&gt;: Do not care about
leading white space in the name of the section.
</span></span></td><td>Maxim Cournoyer</td></tr>