Migrate ESLint to v9 with flat config

- eslint: 8.57.0 → 9.39.2
- eslint-plugin-vue: 9.23.0 → 10.8.0
- eslint-plugin-jsdoc: 48.2.1 → 62.5.5
- Replaced .eslintrc.cjs with eslint.config.mjs (flat config)
- Removed @vue/eslint-config-airbnb and eslint-plugin-import
- Added @eslint/js, globals, vue-eslint-parser, typescript as deps
- Removed stale eslint-disable comments for import/no-unresolved
- Simplified lint script (ESLint 9 handles extensions/ignores via config)

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

.eslintrc.cjs

@@ -1,69 +0,0 @@
-/* eslint-env node */
-const createAliasSetting = require('@vue/eslint-config-airbnb/createAliasSetting');
-
-module.exports = {
-  'root': true,
-  'plugins': [
-    '@dword-design/import-alias',
-  ],
-  'extends': [
-    'plugin:vue/vue3-recommended',
-    'eslint:recommended',
-    'plugin:import/recommended',
-    'plugin:jsdoc/recommended',
-  ],
-  'rules': {
-    // ESLint
-    'indent': ['warn', 2, { 'SwitchCase': 1 }],
-    'comma-dangle': ['warn', 'always-multiline'],
-    'no-unused-vars': ['warn', { 'args': 'none' }],
-    'semi': 'warn',
-    'quotes': ['warn' , 'single'],
-    'object-curly-spacing': ['warn', 'always'],
-
-    // Vue
-    'vue/multi-word-component-names': 'off',
-    'vue/require-default-prop': 'off',
-    'vue/max-attributes-per-line': ['warn', { singleline: { max: 4 } }],
-    'vue/html-self-closing': ['warn', { html: { void: 'always' } }],
-
-    // Imports
-    'import/order': 'warn',
-
-    // JSDoc
-    'jsdoc/require-jsdoc': 'off',
-    'jsdoc/require-returns': 'off',
-    'jsdoc/require-param-description': 'off',
-  },
-  'globals': {
-    '__dirname': 'readonly',
-    'process': 'readonly',
-    'require': 'readonly',
-    'module': 'readonly',
-    'Buffer': 'readonly',
-  },
-  'overrides': [
-    {
-      'files': ['src/**'],
-      'rules': {
-        '@dword-design/import-alias/prefer-alias': ['warn', { 'alias': {
-          '@': './src',
-        } }],
-      },
-    },
-  ],
-  'env': {
-    'vue/setup-compiler-macros': true,
-  },
-  'ignorePatterns': [
-    'src/assets/i18n/index.mjs', // "assert" syntax is currently unrecognized
-  ],
-  'parserOptions': {
-    'ecmaVersion': 13,
-  },
-  settings: {
-    ...createAliasSetting({
-      '@': './src',
-    }),
-  },
-};

app/data/ImageProcessor.mjs

@@ -1,7 +1,6 @@
 import fs from 'fs/promises';
 import path from 'path';
 import mkdirp from 'mkdirp';
-// eslint-disable-next-line import/no-unresolved
 import PQueue from 'p-queue';
 import prefixedConsole from '../common/prefixedConsole.mjs';
 import { normalizeSplatnetResourcePath } from '../common/util.mjs';

app/splatnet/NsoClient.mjs

@@ -1,4 +1,3 @@
-// eslint-disable-next-line import/no-unresolved
 import CoralApi from 'nxapi/coral';
 import { addUserAgent } from 'nxapi';
 import pLimit from 'p-limit';

eslint.config.mjs

@@ -0,0 +1,63 @@
+import js from '@eslint/js';
+import pluginVue from 'eslint-plugin-vue';
+import pluginJsdoc from 'eslint-plugin-jsdoc';
+import importAlias from '@dword-design/eslint-plugin-import-alias';
+import globals from 'globals';
+
+export default [
+  js.configs.recommended,
+  ...pluginVue.configs['flat/recommended'],
+  pluginJsdoc.configs['flat/recommended'],
+
+  // Global settings
+  {
+    languageOptions: {
+      ecmaVersion: 2022,
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+      },
+    },
+    rules: {
+      // ESLint
+      'indent': ['warn', 2, { 'SwitchCase': 1 }],
+      'comma-dangle': ['warn', 'always-multiline'],
+      'no-unused-vars': ['warn', { 'args': 'none' }],
+      'semi': 'warn',
+      'quotes': ['warn', 'single'],
+      'object-curly-spacing': ['warn', 'always'],
+
+      // Vue
+      'vue/multi-word-component-names': 'off',
+      'vue/require-default-prop': 'off',
+      'vue/max-attributes-per-line': ['warn', { singleline: { max: 4 } }],
+      'vue/html-self-closing': ['warn', { html: { void: 'always' } }],
+
+      // JSDoc
+      'jsdoc/require-jsdoc': 'off',
+      'jsdoc/require-returns': 'off',
+      'jsdoc/require-param-description': 'off',
+    },
+  },
+
+  // Import alias for src files
+  {
+    files: ['src/**'],
+    plugins: {
+      '@dword-design/import-alias': importAlias.configs.recommended.plugins['@dword-design/import-alias'],
+    },
+    rules: {
+      '@dword-design/import-alias/prefer-alias': ['warn', { 'alias': {
+        '@': './src',
+      } }],
+    },
+  },
+
+  // Ignored files
+  {
+    ignores: [
+      'dist/**',
+      'src/assets/i18n/index.mjs',
+    ],
+  },
+];

package.json

@@ -5,7 +5,7 @@
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview --port 5050",
-    "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs --ignore-path .gitignore",
+    "lint": "eslint .",
     "lint-fix": "npm run lint -- --fix",
     "cron": "node app/index.mjs cron",
     "start": "npm run sync:download && npm run splatnet:quick && npm run social && npm run cron",
@@ -55,16 +55,18 @@
     "vue-router": "^4.6.4"
   },
   "devDependencies": {
-    "@dword-design/eslint-plugin-import-alias": "^5.0.0",
+    "@dword-design/eslint-plugin-import-alias": "^8.1.3",
+    "@eslint/js": "^9.39.2",
     "@vitejs/plugin-vue": "^5.2.4",
-    "@vue/eslint-config-airbnb": "^8.0.0",
     "autoprefixer": "^10.4.12",
-    "eslint": "^8.23.1",
-    "eslint-plugin-import": "^2.29.1",
-    "eslint-plugin-jsdoc": "^48.2.1",
-    "eslint-plugin-vue": "^9.5.1",
+    "eslint": "^9.39.2",
+    "eslint-plugin-jsdoc": "^62.5.5",
+    "eslint-plugin-vue": "^10.8.0",
+    "globals": "^17.3.0",
     "postcss": "^8.4.16",
     "tailwindcss": "^3.1.8",
-    "vite": "^6.4.1"
+    "typescript": "^5.9.3",
+    "vite": "^6.4.1",
+    "vue-eslint-parser": "^10.4.0"
   }
 }