Add return type to transform_extent (#3169)

vega · Aug 26, 2023 · 303f970 · 303f970
1 parent e5b6d5d
commit 303f970
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/altair/vegalite/v5/api.py b/altair/vegalite/v5/api.py
@@ -1682,7 +1682,7 @@ def transform_joinaggregate(
             core.JoinAggregateTransform(joinaggregate=joinaggregate, groupby=groupby)
         )
 
-    def transform_extent(self, extent: str, param: str):
+    def transform_extent(self, extent: str, param: str) -> Self:
         """Add a :class:`ExtentTransform` to the spec.
 
         Parameters