diff --git a/.copier-answers.yaml b/.copier-answers.yaml
index 046fdfd..df923c8 100644
--- a/.copier-answers.yaml
+++ b/.copier-answers.yaml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: ebb6e1c
+_commit: '4372075'
 _src_path: https://github.com/python-project-templates/base.git
 add_docs: false
 add_extension: python
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 18e05ce..e3339bc 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -15,7 +15,7 @@ on:
   workflow_dispatch:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 permissions:
diff --git a/Makefile b/Makefile
index cf8510d..ec27884 100644
--- a/Makefile
+++ b/Makefile
@@ -25,16 +25,16 @@ lint-py:  ## lint python with ruff
 	python -m ruff format --check hatch_cpp
 
 lint-docs:  ## lint docs with mdformat and codespell
-	python -m mdformat --check README.md 
-	python -m codespell_lib README.md 
+	python -m mdformat --check README.md $(wildcard docs/src)
+	python -m codespell_lib README.md $(wildcard docs/src)
 
 fix-py:  ## autoformat python code with ruff
 	python -m ruff check --fix hatch_cpp
 	python -m ruff format hatch_cpp
 
 fix-docs:  ## autoformat docs with mdformat and codespell
-	python -m mdformat README.md 
-	python -m codespell_lib --write README.md 
+	python -m mdformat README.md $(wildcard docs/src)
+	python -m codespell_lib --write README.md $(wildcard docs/src)
 
 lint: lint-py lint-docs  ## run all linters
 lints: lint
@@ -50,9 +50,9 @@ check-dist:  ## check python sdist and wheel with check-dist
 	check-dist -v
 
 check-types:  ## check python types with ty
-	ty check --python $$(which python)
+	python -m ty check
 
-checks: check-dist
+checks: check-dist check-types
 
 # Alias
 check: checks
diff --git a/hatch_cpp/config.py b/hatch_cpp/config.py
index ca8b946..124b06a 100644
--- a/hatch_cpp/config.py
+++ b/hatch_cpp/config.py
@@ -25,7 +25,7 @@ class HatchCppBuildConfig(BaseModel):
     name: str | None = Field(default=None)
     libraries: list[HatchCppLibrary] = Field(default_factory=list)
     cmake: HatchCppCmakeConfiguration | None = Field(default=None)
-    platform: HatchCppPlatform | None = Field(default_factory=HatchCppPlatform.default)
+    platform: HatchCppPlatform = Field(default_factory=HatchCppPlatform.default)
     vcpkg: HatchCppVcpkgConfiguration | None = Field(default_factory=HatchCppVcpkgConfiguration)
 
     @model_validator(mode="wrap")
@@ -72,7 +72,7 @@ def generate(self):
                 self._active_toolchains.append("vcpkg")
             else:
                 log.warning("HATCH_CPP_VCPKG=1 set but no vcpkg configuration found; ignoring.")
-        elif vcpkg_override != "0" and self.vcpkg and Path(self.vcpkg.vcpkg).exists():
+        elif vcpkg_override != "0" and self.vcpkg and self.vcpkg.vcpkg and Path(self.vcpkg.vcpkg).exists():
             self._active_toolchains.append("vcpkg")
 
         if self.libraries:
@@ -87,6 +87,7 @@ def generate(self):
 
         # Collect toolchain commands
         if "vcpkg" in self._active_toolchains:
+            assert self.vcpkg is not None
             self.commands.extend(self.vcpkg.generate(self))
 
         if "vanilla" in self._active_toolchains:
@@ -108,6 +109,7 @@ def generate(self):
                     self.commands.append(f"{compiler} {' '.join(library.sources)} {compile_flags} {link_flags}")
 
         if "cmake" in self._active_toolchains:
+            assert self.cmake is not None
             self.commands.extend(self.cmake.generate(self))
 
         return self.commands
diff --git a/hatch_cpp/plugin.py b/hatch_cpp/plugin.py
index 3e4f3c4..4d8a4f2 100644
--- a/hatch_cpp/plugin.py
+++ b/hatch_cpp/plugin.py
@@ -104,6 +104,7 @@ def initialize(self, version: str, build_data: dict[str, Any]) -> None:
                 all(lib.py_limited_api for lib in build_plan.libraries),
             )
         else:
+            assert build_plan.cmake is not None
             build_data["pure_python"] = False
             machine = platform_machine()
             version_major = version_info.major
diff --git a/hatch_cpp/tests/test_hatch_build.py b/hatch_cpp/tests/test_hatch_build.py
index b71e185..4766631 100644
--- a/hatch_cpp/tests/test_hatch_build.py
+++ b/hatch_cpp/tests/test_hatch_build.py
@@ -1,3 +1,4 @@
+from importlib import import_module
 from os import listdir
 from pathlib import Path
 from shutil import rmtree
@@ -41,6 +42,6 @@ def test_hatch_build(self):
         # import
         here = Path(__file__).parent / project
         path.insert(0, str(here))
-        import project.extension
+        extension = import_module("project.extension")
 
-        assert project.extension.hello() == "A string"
+        assert extension.hello() == "A string"
diff --git a/hatch_cpp/tests/test_hook_registration.py b/hatch_cpp/tests/test_hook_registration.py
index 75dd412..daf8025 100644
--- a/hatch_cpp/tests/test_hook_registration.py
+++ b/hatch_cpp/tests/test_hook_registration.py
@@ -1,4 +1,5 @@
 from hatchling.builders.hooks.plugin.interface import BuildHookInterface
+from hatchling.metadata.core import ProjectMetadata
 
 from hatch_cpp.hooks import hatch_register_build_hook
 
@@ -10,7 +11,7 @@ def test_registered_build_hook_accepts_hatchling_configuration(tmp_path):
         root=str(tmp_path),
         config=config,
         build_config=None,
-        metadata=None,
+        metadata=ProjectMetadata(str(tmp_path), None, {"project": {"name": "project", "version": "0.1.0"}}),
         directory=str(tmp_path),
         target_name="wheel",
     )
diff --git a/hatch_cpp/tests/test_project_pyodide/pyodide_project/extension.pyi b/hatch_cpp/tests/test_project_pyodide/pyodide_project/extension.pyi
new file mode 100644
index 0000000..ceb4070
--- /dev/null
+++ b/hatch_cpp/tests/test_project_pyodide/pyodide_project/extension.pyi
@@ -0,0 +1 @@
+def answer() -> int: ...
diff --git a/hatch_cpp/tests/test_projects.py b/hatch_cpp/tests/test_projects.py
index 31c54d6..27f467a 100644
--- a/hatch_cpp/tests/test_projects.py
+++ b/hatch_cpp/tests/test_projects.py
@@ -1,4 +1,5 @@
 import contextlib
+from importlib import import_module
 from os import listdir, remove
 from pathlib import Path
 from subprocess import check_call
@@ -60,6 +61,6 @@ def test_basic(self, project):
         # import
         here = Path(__file__).parent / project
         path.insert(0, str(here))
-        import project.extension
+        extension = import_module("project.extension")
 
-        assert project.extension.hello() == "A string"
+        assert extension.hello() == "A string"
diff --git a/hatch_cpp/toolchains/cmake.py b/hatch_cpp/toolchains/cmake.py
index bc53568..685a5ef 100644
--- a/hatch_cpp/toolchains/cmake.py
+++ b/hatch_cpp/toolchains/cmake.py
@@ -3,7 +3,6 @@
 from os import environ
 from pathlib import Path
 from sys import version_info
-from typing import Any
 
 from pydantic import BaseModel, Field
 
@@ -33,7 +32,8 @@ class HatchCppCmakeConfiguration(BaseModel):
 
     include_flags: dict[str, str | int | float | bool] | None = Field(default=None)
 
-    def generate(self, config) -> dict[str, Any]:
+    def generate(self, config) -> list[str]:
+        assert self.root is not None
         commands = []
 
         # Derive prefix
diff --git a/hatch_cpp/toolchains/common.py b/hatch_cpp/toolchains/common.py
index ba455a7..c92c88a 100644
--- a/hatch_cpp/toolchains/common.py
+++ b/hatch_cpp/toolchains/common.py
@@ -48,50 +48,56 @@ class HatchCppLibrary(BaseModel, validate_assignment=True):
     binding: Binding = "cpython"
     std: str | None = None
 
-    include_dirs: list[str] = Field(default_factory=list, alias=AliasChoices("include_dirs", "include-dirs"))
-    include_dirs_linux: list[str] = Field(default_factory=list, alias=AliasChoices("include_dirs_linux", "include-dirs-linux"))
-    include_dirs_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("include_dirs_darwin", "include-dirs-darwin"))
-    include_dirs_win32: list[str] = Field(default_factory=list, alias=AliasChoices("include_dirs_win32", "include-dirs-win32"))
+    include_dirs: list[str] = Field(default_factory=list, validation_alias=AliasChoices("include_dirs", "include-dirs"))
+    include_dirs_linux: list[str] = Field(default_factory=list, validation_alias=AliasChoices("include_dirs_linux", "include-dirs-linux"))
+    include_dirs_darwin: list[str] = Field(default_factory=list, validation_alias=AliasChoices("include_dirs_darwin", "include-dirs-darwin"))
+    include_dirs_win32: list[str] = Field(default_factory=list, validation_alias=AliasChoices("include_dirs_win32", "include-dirs-win32"))
 
-    library_dirs: list[str] = Field(default_factory=list, alias=AliasChoices("library_dirs", "library-dirs"))
-    library_dirs_linux: list[str] = Field(default_factory=list, alias=AliasChoices("library_dirs_linux", "library-dirs-linux"))
-    library_dirs_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("library_dirs_darwin", "library-dirs-darwin"))
-    library_dirs_win32: list[str] = Field(default_factory=list, alias=AliasChoices("library_dirs_win32", "library-dirs-win32"))
+    library_dirs: list[str] = Field(default_factory=list, validation_alias=AliasChoices("library_dirs", "library-dirs"))
+    library_dirs_linux: list[str] = Field(default_factory=list, validation_alias=AliasChoices("library_dirs_linux", "library-dirs-linux"))
+    library_dirs_darwin: list[str] = Field(default_factory=list, validation_alias=AliasChoices("library_dirs_darwin", "library-dirs-darwin"))
+    library_dirs_win32: list[str] = Field(default_factory=list, validation_alias=AliasChoices("library_dirs_win32", "library-dirs-win32"))
 
     libraries: list[str] = Field(default_factory=list)
-    libraries_linux: list[str] = Field(default_factory=list, alias=AliasChoices("libraries_linux", "libraries-linux"))
-    libraries_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("libraries_darwin", "libraries-darwin"))
-    libraries_win32: list[str] = Field(default_factory=list, alias=AliasChoices("libraries_win32", "libraries-win32"))
-
-    extra_compile_args: list[str] = Field(default_factory=list, alias=AliasChoices("extra_compile_args", "extra-compile-args"))
-    extra_compile_args_linux: list[str] = Field(default_factory=list, alias=AliasChoices("extra_compile_args_linux", "extra-compile-args-linux"))
-    extra_compile_args_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("extra_compile_args_darwin", "extra-compile-args-darwin"))
-    extra_compile_args_win32: list[str] = Field(default_factory=list, alias=AliasChoices("extra_compile_args_win32", "extra-compile-args-win32"))
-
-    extra_link_args: list[str] = Field(default_factory=list, alias=AliasChoices("extra_link_args", "extra-link-args"))
-    extra_link_args_linux: list[str] = Field(default_factory=list, alias=AliasChoices("extra_link_args_linux", "extra-link-args-linux"))
-    extra_link_args_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("extra_link_args_darwin", "extra-link-args-darwin"))
-    extra_link_args_win32: list[str] = Field(default_factory=list, alias=AliasChoices("extra_link_args_win32", "extra-link-args-win32"))
-
-    extra_objects: list[str] = Field(default_factory=list, alias=AliasChoices("extra_objects", "extra-objects"))
-    extra_objects_linux: list[str] = Field(default_factory=list, alias=AliasChoices("extra_objects_linux", "extra-objects-linux"))
-    extra_objects_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("extra_objects_darwin", "extra-objects-darwin"))
-    extra_objects_win32: list[str] = Field(default_factory=list, alias=AliasChoices("extra_objects_win32", "extra-objects-win32"))
-
-    define_macros: list[str] = Field(default_factory=list, alias=AliasChoices("define_macros", "define-macros"))
-    define_macros_linux: list[str] = Field(default_factory=list, alias=AliasChoices("define_macros_linux", "define-macros-linux"))
-    define_macros_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("define_macros_darwin", "define-macros-darwin"))
-    define_macros_win32: list[str] = Field(default_factory=list, alias=AliasChoices("define_macros_win32", "define-macros-win32"))
-
-    undef_macros: list[str] = Field(default_factory=list, alias=AliasChoices("undef_macros", "undef-macros"))
-    undef_macros_linux: list[str] = Field(default_factory=list, alias=AliasChoices("undef_macros_linux", "undef-macros-linux"))
-    undef_macros_darwin: list[str] = Field(default_factory=list, alias=AliasChoices("undef_macros_darwin", "undef-macros-darwin"))
-    undef_macros_win32: list[str] = Field(default_factory=list, alias=AliasChoices("undef_macros_win32", "undef-macros-win32"))
-
-    export_symbols: list[str] = Field(default_factory=list, alias=AliasChoices("export_symbols", "export-symbols"))
+    libraries_linux: list[str] = Field(default_factory=list, validation_alias=AliasChoices("libraries_linux", "libraries-linux"))
+    libraries_darwin: list[str] = Field(default_factory=list, validation_alias=AliasChoices("libraries_darwin", "libraries-darwin"))
+    libraries_win32: list[str] = Field(default_factory=list, validation_alias=AliasChoices("libraries_win32", "libraries-win32"))
+
+    extra_compile_args: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_compile_args", "extra-compile-args"))
+    extra_compile_args_linux: list[str] = Field(
+        default_factory=list, validation_alias=AliasChoices("extra_compile_args_linux", "extra-compile-args-linux")
+    )
+    extra_compile_args_darwin: list[str] = Field(
+        default_factory=list, validation_alias=AliasChoices("extra_compile_args_darwin", "extra-compile-args-darwin")
+    )
+    extra_compile_args_win32: list[str] = Field(
+        default_factory=list, validation_alias=AliasChoices("extra_compile_args_win32", "extra-compile-args-win32")
+    )
+
+    extra_link_args: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_link_args", "extra-link-args"))
+    extra_link_args_linux: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_link_args_linux", "extra-link-args-linux"))
+    extra_link_args_darwin: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_link_args_darwin", "extra-link-args-darwin"))
+    extra_link_args_win32: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_link_args_win32", "extra-link-args-win32"))
+
+    extra_objects: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_objects", "extra-objects"))
+    extra_objects_linux: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_objects_linux", "extra-objects-linux"))
+    extra_objects_darwin: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_objects_darwin", "extra-objects-darwin"))
+    extra_objects_win32: list[str] = Field(default_factory=list, validation_alias=AliasChoices("extra_objects_win32", "extra-objects-win32"))
+
+    define_macros: list[str] = Field(default_factory=list, validation_alias=AliasChoices("define_macros", "define-macros"))
+    define_macros_linux: list[str] = Field(default_factory=list, validation_alias=AliasChoices("define_macros_linux", "define-macros-linux"))
+    define_macros_darwin: list[str] = Field(default_factory=list, validation_alias=AliasChoices("define_macros_darwin", "define-macros-darwin"))
+    define_macros_win32: list[str] = Field(default_factory=list, validation_alias=AliasChoices("define_macros_win32", "define-macros-win32"))
+
+    undef_macros: list[str] = Field(default_factory=list, validation_alias=AliasChoices("undef_macros", "undef-macros"))
+    undef_macros_linux: list[str] = Field(default_factory=list, validation_alias=AliasChoices("undef_macros_linux", "undef-macros-linux"))
+    undef_macros_darwin: list[str] = Field(default_factory=list, validation_alias=AliasChoices("undef_macros_darwin", "undef-macros-darwin"))
+    undef_macros_win32: list[str] = Field(default_factory=list, validation_alias=AliasChoices("undef_macros_win32", "undef-macros-win32"))
+
+    export_symbols: list[str] = Field(default_factory=list, validation_alias=AliasChoices("export_symbols", "export-symbols"))
     depends: list[str] = Field(default_factory=list)
 
-    py_limited_api: str | None = Field(default="", alias=AliasChoices("py_limited_api", "py-limited-api"))
+    py_limited_api: str | None = Field(default="", validation_alias=AliasChoices("py_limited_api", "py-limited-api"))
 
     @field_validator("py_limited_api", mode="before")
     @classmethod
diff --git a/hatch_cpp/toolchains/vcpkg.py b/hatch_cpp/toolchains/vcpkg.py
index 17945de..5856e40 100644
--- a/hatch_cpp/toolchains/vcpkg.py
+++ b/hatch_cpp/toolchains/vcpkg.py
@@ -31,7 +31,7 @@
     "arm64-windows-static-md",
     "wasm32-emscripten",
 ]
-VcpkgPlatformDefaults = {
+VcpkgPlatformDefaults: dict[tuple[str, str], VcpkgTriplet] = {
     ("linux", "x86_64"): "x64-linux",
     ("linux", "aarch64"): "arm64-linux",
     ("darwin", "x86_64"): "x64-osx",
@@ -65,7 +65,7 @@ def _read_vcpkg_ref_from_gitmodules(vcpkg_root: Path) -> str | None:
 
 class HatchCppVcpkgConfiguration(BaseModel):
     vcpkg: str | None = Field(default="vcpkg.json")
-    vcpkg_root: Path | None = Field(default=Path("vcpkg"))
+    vcpkg_root: Path = Field(default=Path("vcpkg"))
     vcpkg_repo: str | None = Field(default="https://github.com/microsoft/vcpkg.git")
     vcpkg_triplet: VcpkgTriplet | None = Field(default=None)
     vcpkg_ref: str | None = Field(
diff --git a/pyproject.toml b/pyproject.toml
index 8198cf6..5cc3368 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,6 +52,7 @@ develop = [
     "hatchling",
     "hatch-build>=0.3.2",
     "mdformat",
+    "mdformat-frontmatter",
     "mdformat-tables>=1",
     "pytest",
     "pytest-cov",
@@ -97,7 +98,7 @@ replace = 'version = "{new_version}"'
 [tool.coverage.run]
 branch = false
 omit = [
-    "hatch_cpp/tests/integration/",
+    "hatch_cpp/tests/integration/*",
 ]
 patch = ["subprocess"]