Add Lefthook pre-commit configuration

README.md

@@ -2,4 +2,19 @@
 
 Uitslagensoftware gebouwd door Team Urn.
 
-Copyright © 2024 Kiesraad. Licensed under the EUPL-1.2 or later.
+Copyright © 2024 Kiesraad. Licensed under the EUPL-1.2 or later.
+
+## Project structure
+
+Backend: `backend/`  
+Frontend: `frontend/`
+
+See `README.md` in each directory for more information.
+
+## Git pre-commit hook using Lefthook
+
+This project uses [Lefthook] to manage the Git pre-commit hook. Lefthook will
+be installed automatically when `npm install` is run in the `frontend`
+directory.
+
+[Lefthook]: https://github.com/evilmartians/lefthook

frontend/package.json

@@ -49,6 +49,7 @@
     "eslint-plugin-react-refresh": "^0.4.6",
     "identity-obj-proxy": "^3.0.0",
     "jsdom": "^24.0.0",
+    "lefthook": "^1.6.10",
     "lint-staged": "^15.2.2",
     "msw": "^2.2.13",
     "postcss": "^8.4.38",

lefthook.yml

@@ -0,0 +1,18 @@
+assert_lefthook_installed: true
+
+pre-commit:
+  parallel: true
+  commands:
+    backend-formatter:
+      root: "backend/"
+      glob: "*.rs"
+      run: cargo fmt
+    backend-linter:
+      root: "backend/"
+      glob: "*.rs"
+      run: cargo clippy --fix
+      stage_fixed: true
+    frontend-linter:
+      root: "frontend/"
+      glob: "*.{ts,tsx}"
+      run: npm run lint