Create py.typed files during uv init --lib (#7232)

crates/uv/src/commands/project/init.rs

@@ -537,9 +537,10 @@ impl InitProjectKind {
 
         // Create `src/{name}/__init__.py`, if it doesn't exist already.
         let src_dir = path.join("src").join(&*name.as_dist_info_name());
+        fs_err::create_dir_all(&src_dir)?;
+
         let init_py = src_dir.join("__init__.py");
         if !init_py.try_exists()? {
-            fs_err::create_dir_all(&src_dir)?;
             fs_err::write(
                 init_py,
                 indoc::formatdoc! {r#"
@@ -549,6 +550,10 @@ impl InitProjectKind {
             )?;
         }
 
+        // Create a `py.typed` file
+        let py_typed = src_dir.join("py.typed");
+        fs_err::write(py_typed, "")?;
+
         // Write .python-version if it doesn't exist.
         if let Some(python_request) = python_request {
             if PythonVersionFile::discover(path, false, false)

crates/uv/tests/init.rs

@@ -329,6 +329,7 @@ fn init_library() -> Result<()> {
 
     let pyproject_toml = child.join("pyproject.toml");
     let init_py = child.join("src").join("foo").join("__init__.py");
+    let py_typed = child.join("src").join("foo").join("py.typed");
 
     uv_snapshot!(context.filters(), context.init().current_dir(&child).arg("--lib"), @r###"
     success: true
@@ -372,6 +373,15 @@ fn init_library() -> Result<()> {
         );
     });
 
+    let py_typed = fs_err::read_to_string(py_typed)?;
+    insta::with_settings!({
+        filters => context.filters(),
+    }, {
+        assert_snapshot!(
+            py_typed, @""
+        );
+    });
+
     uv_snapshot!(context.filters(), context.run().current_dir(&child).arg("python").arg("-c").arg("import foo; print(foo.hello())"), @r###"
     success: true
     exit_code: 0

docs/concepts/projects.md

@@ -161,6 +161,7 @@ example-lib
 ├── pyproject.toml
 └── src
     └── example_lib
+        ├── py.typed
         └── __init__.py
 ```