Fix function supports_feature to return False when target_versions is empty. [skip news] (psf#4726)

ranjodhsingh1729 · web-flow · commit 3a96e06025da · 2025-08-04T17:54:49.000+05:30
* Fix function `supports_feature` to return False when `target_versions` is empty.

* supports_feature: raise ValueError if target_versions is empty
diff --git a/src/black/mode.py b/src/black/mode.py
@@ -190,6 +190,9 @@ class Feature(Enum):
 
 
 def supports_feature(target_versions: set[TargetVersion], feature: Feature) -> bool:
+    if not target_versions:
+        raise ValueError("target_versions must not be empty")
+
     return all(feature in VERSION_TO_FEATURES[version] for version in target_versions)
 
 
