feat : add ESLint linter to frontend with pre-commit hook

Add ESLint with @nuxt/eslint-config enforcing 4-space indentation.
Add make nuxt-lint and nuxt-lint-fix targets.
Add ESLint check to pre-commit hook (lint only, no auto-fix).
Fix auth.vue indentation from 2 to 4 spaces.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/app/layouts/auth.vue

@@ -1,7 +1,7 @@
 <template>
-  <div class="min-h-screen bg-tertiary-500 from-tertiary-500 via-white to-neutral-100 text-neutral-900">
-    <main class="mx-auto flex min-h-screen w-full max-w-[720px] items-center px-6 py-12">
-      <slot />
-    </main>
-  </div>
+    <div class="min-h-screen bg-tertiary-500 from-tertiary-500 via-white to-neutral-100 text-neutral-900">
+        <main class="mx-auto flex min-h-screen w-full max-w-[720px] items-center px-6 py-12">
+            <slot />
+        </main>
+    </div>
 </template>

frontend/eslint.config.mjs

@@ -0,0 +1,60 @@
+import nuxt from '@nuxt/eslint-config'
+
+export default await nuxt(
+    {
+        features: {
+            stylistic: false,
+            typescript: true,
+            nuxt: {
+                sortConfigKeys: false,
+            },
+        },
+        dirs: {
+            root: ['.', './app'],
+        },
+    },
+    {
+        name: 'coltura/custom-overrides',
+        rules: {
+            // Indentation 4 espaces (convention CLAUDE.md)
+            'vue/html-indent': ['error', 4],
+            indent: ['error', 4, { SwitchCase: 1 }],
+
+            // Vue — relaxed
+            'vue/multi-word-component-names': 'off',
+            'vue/no-multiple-template-root': 'off',
+            'vue/require-default-prop': 'off',
+            'vue/html-self-closing': 'off',
+            'vue/singleline-html-element-content-newline': 'off',
+            'vue/multiline-html-element-content-newline': 'off',
+            'vue/attributes-order': 'off',
+            'vue/v-on-event-hyphenation': 'off',
+
+            // Console — allow console.error only
+            'no-console': ['warn', { allow: ['error'] }],
+
+            // Unused vars — warn, ignore underscore-prefixed
+            'no-unused-vars': 'off',
+            '@typescript-eslint/no-unused-vars': ['warn', {
+                argsIgnorePattern: '^_',
+                varsIgnorePattern: '^_',
+                caughtErrorsIgnorePattern: '^_',
+            }],
+
+            // TypeScript — progressive strictness
+            '@typescript-eslint/no-explicit-any': 'warn',
+            '@typescript-eslint/no-dynamic-delete': 'off',
+            '@typescript-eslint/no-invalid-void-type': 'off',
+
+            // Formatting — leave to stylistic tools
+            'require-await': 'off',
+            'comma-dangle': 'off',
+            curly: 'off',
+            semi: 'off',
+            quotes: 'off',
+            'no-trailing-spaces': 'off',
+            'no-multiple-empty-lines': 'off',
+            'no-irregular-whitespace': 'off',
+        },
+    },
+)

frontend/package.json

@@ -8,7 +8,9 @@
     "generate": "nuxt generate",
     "preview": "nuxt preview",
     "postinstall": "nuxt prepare",
-    "build:dist": "nuxt generate && rm -rf dist && cp -R .output/public dist"
+    "build:dist": "nuxt generate && rm -rf dist && cp -R .output/public dist",
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix"
   },
   "dependencies": {
     "@malio/layer-ui": "^1.2.3",
@@ -21,5 +23,13 @@
     "pinia": "^3.0.4",
     "vue": "^3.5.29",
     "vue-router": "^4.6.4"
+  },
+  "devDependencies": {
+    "@nuxt/eslint-config": "^1.9.0",
+    "@typescript-eslint/eslint-plugin": "^8.44.1",
+    "@typescript-eslint/parser": "^8.44.1",
+    "eslint": "^9.36.0",
+    "eslint-plugin-vue": "^10.5.0",
+    "vue-eslint-parser": "^10.2.0"
   }
 }

makefile

@@ -53,6 +53,12 @@ build-nuxtJS:
 dev-nuxt:
 	$(EXEC_PHP) sh -c "cd frontend && npm run dev"
 
+nuxt-lint:
+	$(EXEC_PHP) sh -c "cd frontend && npm run lint"
+
+nuxt-lint-fix:
+	$(EXEC_PHP) sh -c "cd frontend && npm run lint:fix"
+
 delete_built_dir:
 	CURRENT_UID=$(shell id -u) CURRENT_GID=$(shell id -g) $(DOCKER_COMPOSE) up -d
 	$(DOCKER) exec -u root $(PHP_CONTAINER) rm -rf vendor/

pre-commit

@@ -24,6 +24,16 @@ else
 fi
 echo "--- php-cs-fixer pre commit hook finish---"
 
+echo "--- eslint pre commit hook start ---"
+make nuxt-lint
+ESLINT_RESULT=$?
+
+if [ $ESLINT_RESULT -ne 0 ]; then
+    echo "ESLint failed. Aborting commit."
+    exit 1
+fi
+echo "--- eslint pre commit hook finished ---"
+
 echo "--- phpunit pre commit hook start ---"
 make test
 PHPUNIT_RESULT=$?