Add GitHub action for type checking with mypy (#42)

Co-authored-by: Alek Binion <[email protected]>
Co-authored-by: duolingo[bot] <34079079+duolingo[bot]@users.noreply.github.com>

.github/workflows/mypy.yml

@@ -0,0 +1,30 @@
+name: "Typing"
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  run:
+    name: "typing"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.7", "3.10"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Hatch
+        uses: pypa/hatch@install
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Run mypy
+        run: hatch run types:check --python ${{ matrix.python-version }}

README.md

@@ -1,6 +1,8 @@
 # minject
 
 ![PyPI version](https://img.shields.io/pypi/v/minject)
+[![Unit Tests](https://github.com/duolingo/minject/actions/workflows/hatch_test.yml/badge.svg?branch=master)](https://github.com/duolingo/minject/actions/workflows/hatch_test.yml)
+[![Typing](https://github.com/duolingo/minject/actions/workflows/mypy.yml/badge.svg?branch=master)](https://github.com/duolingo/minject/actions/workflows/mypy.yml)
 
 [**Philosophy**](#philosophy)
 | [**Documentation**](https://github.com/duolingo/minject/blob/master/docs/dependency_injection.md)

pyproject.toml

@@ -48,3 +48,10 @@ dependencies = [
 
 [[tool.hatch.envs.hatch-test.matrix]]
 python = ["3.7", "3.10"]
+
+
+[tool.hatch.envs.types.scripts]
+check = "mypy --install-types --non-interactive minject"
+
+[[tool.hatch.envs.types.matrix]]
+python = ["3.7", "3.10"]