fix(version): exec code with lazy type in dataclass

backend/src/hatchling/version/source/code.py

@@ -47,6 +47,10 @@ def get_version_data(self) -> dict:
         spec = spec_from_file_location(os.path.splitext(path)[0], path)
         module = module_from_spec(spec)  # type: ignore[arg-type]
 
+        # This fixes using PEP 563 (__future__ annotations) with dataclasses.
+        # https://github.com/pypa/hatch/issues/1863
+        sys.modules[os.path.splitext(path)[0]] = module
+
         old_search_paths = list(sys.path)
         try:
             sys.path[:] = [*absolute_search_paths, *old_search_paths]

tests/backend/version/source/test_code.py

@@ -125,3 +125,65 @@ def foo(version_info):
 
     with temp_dir.as_cwd():
         assert source.get_version_data()['version'] == '1.0.0.1.dev0'
+
+
+def test_pep563_with_dataclasses_1(temp_dir, helpers):
+    """
+    Test postponed evaluation of annotations (using __future__) with dataclasses.
+
+    References:
+       - https://github.com/pypa/hatch/issues/1863
+    """
+    source = CodeSource(str(temp_dir), {'path': 'a/b.py'})
+
+    file_path = temp_dir / 'a' / 'b.py'
+    file_path.ensure_parent_dir_exists()
+    file_path.write_text(
+        helpers.dedent(
+            """
+            from __future__ import annotations
+
+            from dataclasses import dataclass
+
+            @dataclass
+            class VersionConfig:
+                test_dir: str | None = None
+                verbose: bool = False
+
+            __version__ = "0.1.1"
+            """
+        )
+    )
+
+    with temp_dir.as_cwd():
+        assert source.get_version_data()['version'] == '0.1.1'
+
+
+def test_pep563_with_dataclasses_2(temp_dir, helpers):
+    """
+    Test postponed evaluation of annotations (using "type" string) with dataclasses.
+
+    References:
+       - https://github.com/pypa/hatch/issues/1863
+    """
+    source = CodeSource(str(temp_dir), {'path': 'a/b.py'})
+
+    file_path = temp_dir / 'a' / 'b.py'
+    file_path.ensure_parent_dir_exists()
+    file_path.write_text(
+        helpers.dedent(
+            """
+            from dataclasses import dataclass
+
+            @dataclass
+            class VersionConfig:
+                test_dir: "str | None" = None
+                verbose: bool = False
+
+            __version__ = "0.1.1"
+            """
+        )
+    )
+
+    with temp_dir.as_cwd():
+        assert source.get_version_data()['version'] == '0.1.1'