Dev-iL commented on code in PR #56944:
URL: https://github.com/apache/airflow/pull/56944#discussion_r2448251487


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airflow-core/src/airflow/api_fastapi/core_api/services/ui/calendar.py:
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@@ -40,6 +40,12 @@
 from airflow.timetables.base import DataInterval, TimeRestriction
 from airflow.timetables.simple import ContinuousTimetable
 
+TYPE_CHECKING: bool = False
+if TYPE_CHECKING:

Review Comment:
   Ah this is an optimization for those cases when importing (from) the 
`typing` module itself is undesired (e.g. too heavy). Not sure where I saw this 
approach, but as you can see it's common enough for mypy to allow it.



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