Add mypy to tooling

.github/workflows/lint.yml

@@ -5,7 +5,7 @@ on:
   schedule:
     - cron: '0 7 * * 1'
 jobs:
-  lint:
+  lint-ruff:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
@@ -17,7 +17,36 @@ jobs:
         uses: astral-sh/setup-uv@v7
       - name: Install the dependencies
         run: uv sync --all-extras --dev
-      - name: Lint with ruff & pyright
+      - name: Lint with ruff
         run: |
           uv run ruff check pydantic_partial tests
+  lint-pyright:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - name: Set up Python
+        uses: actions/setup-python@v7
+        with:
+          python-version-file: ".python-version"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+      - name: Install the dependencies
+        run: uv sync --all-extras --dev
+      - name: Lint with pyright
+        run: |
           uv run pyright pydantic_partial
+  lint-mypy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - name: Set up Python
+        uses: actions/setup-python@v7
+        with:
+          python-version-file: ".python-version"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+      - name: Install the dependencies
+        run: uv sync --all-extras --dev
+      - name: Lint with mypy
+        run: |
+          uv run mypy pydantic_partial

justfile

@@ -34,6 +34,8 @@ ruff *args: (uv "run" "ruff" "check" "pydantic_partial" "tests" args)
 
 pyright *args: (uv "run" "pyright" "pydantic_partial" args)
 
+mypy *args: (uv "run" "mypy" "pydantic_partial" args)
+
 lint: ruff pyright
 
 release version: (uv "version" version)

prek.toml

@@ -46,6 +46,19 @@ hooks = [
   }
 ]
 
+[[repos]]
+repo = "https://github.com/pre-commit/mirrors-mypy"
+rev = "v2.3.0"
+hooks = [
+  {
+    id = "mypy",
+    files = "^pydantic_partial/",
+    additional_dependencies = [
+        "pydantic>=2.0.0,<3.0.0",
+    ],
+  }
+]
+
 [[repos]]
 repo = "https://github.com/alessandrojcm/commitlint-pre-commit-hook"
 rev = "v9.26.0"

pydantic_partial/partial.py

@@ -33,7 +33,7 @@ class Something(PartialModelMixin, pydantic.BaseModel):
 try:
     from types import UnionType
 except ImportError:
-    UnionType = Union
+    UnionType = Union  # type: ignore[misc,assignment]
 
 import pydantic