Migre eslint v8 → v9 (flat config), supprime les dépréciations

- eslint 8 → 9, @typescript-eslint/* → typescript-eslint (package unifié)
- Remplace .eslintrc.json par eslint.config.mjs (backend) et eslint.config.js (frontend)
- Ajoute eslint-plugin-react, eslint-plugin-react-hooks, globals (frontend)
- Supprime rimraf@3, @humanwhocodes/* qui étaient des deps transitives d'eslint v8

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/.eslintrc.json

@@ -1,22 +0,0 @@
-{
-  "env": {
-    "node": true,
-    "es2021": true
-  },
-  "extends": [
-    "eslint:recommended",
-    "plugin:@typescript-eslint/recommended"
-  ],
-  "parser": "@typescript-eslint/parser",
-  "parserOptions": {
-    "ecmaVersion": "latest",
-    "sourceType": "module"
-  },
-  "plugins": [
-    "@typescript-eslint"
-  ],
-  "rules": {
-    "@typescript-eslint/no-unused-vars": "warn",
-    "@typescript-eslint/no-explicit-any": "warn"
-  }
-}

backend/eslint.config.mjs

@@ -0,0 +1,16 @@
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    rules: {
+      '@typescript-eslint/no-unused-vars': 'warn',
+      '@typescript-eslint/no-explicit-any': 'warn',
+    },
+  },
+  {
+    ignores: ['dist/**', 'node_modules/**'],
+  }
+);

backend/package.json

@@ -33,9 +33,9 @@
     "@types/bcryptjs": "^2.4.2",
     "typescript": "^5.2.2",
     "tsx": "^4.1.0",
-    "eslint": "^8.50.0",
-    "@typescript-eslint/eslint-plugin": "^6.7.5",
-    "@typescript-eslint/parser": "^6.7.5",
+    "eslint": "^9.18.0",
+    "@eslint/js": "^9.18.0",
+    "typescript-eslint": "^8.22.0",
     "vitest": "^0.34.6"
   }
 }

frontend/.eslintrc.json

@@ -1,34 +0,0 @@
-{
-  "env": {
-    "browser": true,
-    "es2021": true
-  },
-  "extends": [
-    "eslint:recommended",
-    "plugin:@typescript-eslint/recommended",
-    "plugin:react/recommended",
-    "plugin:react-hooks/recommended"
-  ],
-  "parser": "@typescript-eslint/parser",
-  "parserOptions": {
-    "ecmaFeatures": {
-      "jsx": true
-    },
-    "ecmaVersion": "latest",
-    "sourceType": "module"
-  },
-  "plugins": [
-    "@typescript-eslint",
-    "react"
-  ],
-  "rules": {
-    "react/react-in-jsx-scope": "off",
-    "@typescript-eslint/no-unused-vars": "warn",
-    "@typescript-eslint/no-explicit-any": "warn"
-  },
-  "settings": {
-    "react": {
-      "version": "detect"
-    }
-  }
-}

frontend/eslint.config.js

@@ -0,0 +1,34 @@
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import reactPlugin from 'eslint-plugin-react';
+import reactHooksPlugin from 'eslint-plugin-react-hooks';
+import globals from 'globals';
+
+export default tseslint.config(
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    plugins: {
+      react: reactPlugin,
+      'react-hooks': reactHooksPlugin,
+    },
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+      },
+    },
+    rules: {
+      'react/react-in-jsx-scope': 'off',
+      '@typescript-eslint/no-unused-vars': 'warn',
+      '@typescript-eslint/no-explicit-any': 'warn',
+      'react-hooks/rules-of-hooks': 'error',
+      'react-hooks/exhaustive-deps': 'warn',
+    },
+    settings: {
+      react: { version: 'detect' },
+    },
+  },
+  {
+    ignores: ['dist/**', 'node_modules/**'],
+  }
+);

frontend/package.json

@@ -23,11 +23,14 @@
   "devDependencies": {
     "@types/react": "^18.2.28",
     "@types/react-dom": "^18.2.13",
-    "@typescript-eslint/eslint-plugin": "^6.7.5",
-    "@typescript-eslint/parser": "^6.7.5",
     "@vitejs/plugin-react": "^4.1.0",
     "autoprefixer": "^10.4.16",
-    "eslint": "^8.50.0",
+    "eslint": "^9.18.0",
+    "@eslint/js": "^9.18.0",
+    "typescript-eslint": "^8.22.0",
+    "eslint-plugin-react": "^7.37.0",
+    "eslint-plugin-react-hooks": "^5.1.0",
+    "globals": "^15.0.0",
     "postcss": "^8.4.31",
     "tailwindcss": "^3.3.3",
     "typescript": "^5.2.2",