install lefthook s.t. I don't accidentally commit unformatted changes

Author: aster-void

lefthook.yml

@@ -0,0 +1,8 @@
+pre-commit:
+  parallel: true
+  commands:
+    eslint:
+      glob: "*.{js,ts,jsx,tsx,md,mdx}"
+      run: npm run lint # not doing fix to prevent implicit behaviour potentially breaking something
+      exclude: "contents"
+      # stage_fixed: true # ↑を lint:fix に変更する場合、これを uncomment すること

package-lock.json

@@ -14,7 +14,8 @@
     "serve": "gatsby serve",
     "clean": "gatsby clean",
     "lint": "eslint .",
-    "type-check": "tsc --noEmit"
+    "type-check": "tsc --noEmit",
+    "prepare": "lefthook install"
   },
   "dependencies": {
     "@headlessui/react": "^1.7.18",
@@ -49,9 +50,10 @@
     "eslint": "^8.56.0",
     "eslint-config-airbnb-typescript-prettier": "^5.0.0",
     "gatsby-plugin-postcss": "^6.13.1",
+    "lefthook": "^1.9.2",
     "postcss": "^8.4.33",
     "prettier": "^2.8.8",
     "tailwindcss": "^3.4.1",
     "typescript": "5.1.6"
   }
-}
+}