XD-DENG commented on a change in pull request #15582:
URL: https://github.com/apache/airflow/pull/15582#discussion_r624472183
##########
File path: airflow/utils/helpers.py
##########
@@ -21,7 +21,7 @@
from datetime import datetime
from functools import reduce
from itertools import filterfalse, tee
-from typing import Any, Callable, Dict, Generator, Iterable, List, Optional,
TypeVar
+from typing import TYPE_CHECKING, Any, Callable, Dict, Generator, Iterable,
List, Optional, TypeVar
Review comment:
```suggestion
from typing import TYPE_CHECKING, Any, Callable, Dict, Generator, Iterable,
List, Optional, Tuple, TypeVar
```
This is needed to address the static check error caused by line 187
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