fix: Override exports when merging module stubs

Issue-mkdocstrings-751: mkdocstrings/mkdocstrings#751

Author: pawamoy

src/_griffe/merger.py

@@ -56,6 +56,10 @@ def _merge_stubs_members(obj: Module | Class, stubs: Module | Class) -> None:
     # Merge imports to later know if objects coming from the stubs were imported.
     obj.imports.update(stubs.imports)
 
+    # Override exports to later know if objects coming from the stubs were exported.
+    if stubs.exports is not None:
+        obj.exports = stubs.exports
+
     for member_name, stub_member in stubs.members.items():
         if member_name in obj.members:
             # We don't merge imported stub objects that already exist in the concrete module.

tests/test_merger.py

@@ -49,6 +49,19 @@ def test_merge_imports() -> None:
         assert set(pkg["mod"].imports) == {"abc", "collections"}
 
 
+def test_override_exports() -> None:
+    """Assert that exports are overridden too (like imports are merged)."""
+    with temporary_visited_package(
+        "package",
+        {
+            "__init__.py": "import dynamic_all\n__all__ = dynamic_all()",
+            "__init__.pyi": "from ._hello import hello\n__all__ = ['hello']",
+            "_hello.py": "def hello() -> None:\n    '''Say hello.'''",
+        },
+    ) as pkg:
+        assert pkg.exports == ["hello"]
+
+
 def test_merge_attribute_values() -> None:
     """Assert that attribute values are merged correctly."""
     with temporary_visited_package(