[py-tx] updated the covaraince of TUpdateRecordValue to allow for mor…

…e flexability in derived type varince (#1670)
facebook · Oct 28, 2024 · 911f83a · 911f83a
1 parent 8d10599
commit 911f83a
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diff --git a/python-threatexchange/threatexchange/exchanges/fetch_state.py b/python-threatexchange/threatexchange/exchanges/fetch_state.py
@@ -21,7 +21,7 @@
 # Note - key is artificially restricted, but it's simple to add more or even
 #        remove the restriction entirely if eventually needed
 TUpdateRecordKey = t.TypeVar("TUpdateRecordKey", str, int, t.Tuple[str, str])
-TUpdateRecordValue = t.TypeVar("TUpdateRecordValue")
+TUpdateRecordValue = t.TypeVar("TUpdateRecordValue", covariant=True)
 
 
 @dataclass

diff --git a/python-threatexchange/threatexchange/exchanges/signal_exchange_api.py b/python-threatexchange/threatexchange/exchanges/signal_exchange_api.py
@@ -309,8 +309,8 @@ class SignalExchangeAPIWithSimpleUpdates(
         state.TFetchCheckpoint,
         state.TFetchedSignalMetadata,
         t.Tuple[str, str],
-        t.Any,
-    ]
+        state.TFetchedSignalMetadata,
+    ],
 ):
     """
     An API that conveniently maps directly into the form needed by index.