chore: Add Biome linter/formatter with pre-commit hooks

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Lint
+        run: pnpm lint
+
+      - name: Type check
+        run: pnpm typecheck
+
+      - name: Build
+        run: pnpm build

.husky/pre-commit

@@ -0,0 +1 @@
+pnpm lint-staged

biome.json

@@ -0,0 +1,57 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.3.10/schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "files": {
+    "includes": [
+      "**/src/**/*.ts",
+      "**/src/**/*.tsx",
+      "**/tests/**/*.ts",
+      "!**/node_modules",
+      "!**/dist",
+      "!**/.wrangler"
+    ]
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 100
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "a11y": {
+        "recommended": true
+      },
+      "correctness": {
+        "noUnusedImports": "error",
+        "noUnusedVariables": "warn"
+      },
+      "style": {
+        "noNonNullAssertion": "warn",
+        "useImportType": "error"
+      },
+      "suspicious": {
+        "noExplicitAny": "warn",
+        "noArrayIndexKey": "warn",
+        "noConfusingVoidType": "off"
+      },
+      "complexity": {
+        "noStaticOnlyClass": "warn"
+      }
+    }
+  },
+  "assist": { "actions": { "source": { "organizeImports": "on" } } },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "trailingCommas": "es5",
+      "semicolons": "always"
+    }
+  }
+}

package.json

@@ -11,7 +11,16 @@
     "preview": "vite preview",
     "deploy": "vite build && wrangler deploy",
     "typecheck": "tsc --noEmit",
-    "typecheck:client": "tsc --noEmit -p tsconfig.client.json"
+    "typecheck:client": "tsc --noEmit -p tsconfig.client.json",
+    "lint": "biome check src tests",
+    "lint:fix": "biome check --write src tests",
+    "format": "biome format --write src tests",
+    "prepare": "husky"
+  },
+  "lint-staged": {
+    "*.{ts,tsx}": [
+      "biome check --write --no-errors-on-unmatched"
+    ]
   },
   "keywords": [
     "github",
@@ -41,6 +50,7 @@
     "tailwind-merge": "^2.6.0"
   },
   "devDependencies": {
+    "@biomejs/biome": "2.3.10",
     "@cloudflare/workers-types": "^4.0.0",
     "@playwright/test": "1.57.0",
     "@types/node": "^20.0.0",
@@ -49,6 +59,8 @@
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",
     "concurrently": "^9.1.0",
+    "husky": "9.1.7",
+    "lint-staged": "16.2.7",
     "postcss": "^8.4.49",
     "tailwindcss": "^3.4.17",
     "tailwindcss-animate": "^1.0.7",