Suggestions

Author: cdce8p

setuptools/config/_apply_pyprojecttoml.py

@@ -89,6 +89,21 @@ def _apply_tool_table(dist: Distribution, config: dict, filename: StrPath):
     if not tool_table:
         return  # short-circuit
 
+    if "license-files" in tool_table:
+        if dist.metadata.license_files:
+            raise InvalidConfigError(
+                "'project.license-files' is defined already. "
+                "Remove 'tool.setuptools.license-files'."
+            )
+
+        pypa_guides = "guides/writing-pyproject-toml/#license-files"
+        SetuptoolsDeprecationWarning.emit(
+            "'tool.setuptools.license-files' is deprecated in favor of "
+            "'project.license-files'",
+            see_url=f"https://packaging.python.org/en/latest/{pypa_guides}",
+            due_date=(2026, 2, 18),  # Warning introduced on 2025-02-18
+        )
+
     for field, value in tool_table.items():
         norm_key = json_compatible_key(field)
 
@@ -100,23 +115,6 @@ def _apply_tool_table(dist: Distribution, config: dict, filename: StrPath):
             """
             raise RemovedConfigError("\n".join([cleandoc(msg), suggestion]))
 
-        if norm_key == "license_files":
-            if dist.metadata.license_files:
-                raise InvalidConfigError(
-                    "'project.license-files' is defined already. "
-                    "Remove 'tool.setuptools.license-files'."
-                )
-
-            pypa_guides = "guides/writing-pyproject-toml/#license-files"
-            SetuptoolsDeprecationWarning.emit(
-                "'tool.setuptools.license-files' is deprecated in favor of "
-                "'project.license-files'",
-                see_url=f"https://packaging.python.org/en/latest/{pypa_guides}",
-            )
-            # Warning introduced on 2025-02-18
-            # TODO: Should we add a due date? It may affect old/unmaintained
-            #       packages in the ecosystem and cause problems...
-
         norm_key = TOOL_TABLE_RENAMES.get(norm_key, norm_key)
         corresp = TOOL_TABLE_CORRESPONDENCE.get(norm_key, norm_key)
         if callable(corresp):