Migrate to ESLint flat config

eslint.config.js

@@ -0,0 +1,59 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import tsEslint from 'typescript-eslint';
+import globals from 'globals';
+
+export default tsEslint.config(
+  eslint.configs.recommended,
+  ...tsEslint.configs.recommended,
+  {
+    ignores: [
+      'dist',
+      'node_modules',
+      'typings.d.ts',
+      'assets',
+      '.rollup.cache',
+    ],
+  },
+  {
+    files: ['lib/*.js'],
+    languageOptions: {
+      globals: globals.browser,
+    },
+  },
+  {
+    files: ['*.config.js'],
+    languageOptions: {
+      globals: globals.node,
+    },
+  },
+  {
+    files: ['**/*.js'],
+    rules: {
+      semi: 'error',
+      'comma-dangle': [
+        'error',
+        'always-multiline',
+      ],
+      quotes: [
+        'error',
+        'single',
+        {
+          avoidEscape: true,
+          allowTemplateLiterals: true,
+        },
+      ],
+      'max-len': [
+        'error',
+        {
+          code: 100,
+          ignoreComments: true,
+          ignoreStrings: true,
+          ignoreTemplateLiterals: true,
+        },
+      ],
+      'quote-props': ['error', 'as-needed'],
+    },
+  },
+);

lib/env.d.ts

@@ -4,6 +4,7 @@ export declare global {
   const COMPAT: boolean;
 
   namespace mw {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const libs: Record<string, any>;
   }
 }

package.json

@@ -20,23 +20,25 @@
     "test": "jest"
   },
   "devDependencies": {
+    "@eslint/js": "^8.56.0",
     "@rollup/plugin-replace": "^5.0.2",
     "@rollup/plugin-typescript": "^9.0.2",
     "@types/jest": "^28.1.6",
     "@types/jquery": "^3.5.14",
-    "@typescript-eslint/eslint-plugin": "^5.30.6",
-    "@typescript-eslint/parser": "^5.30.6",
-    "eslint": "^8.20.0",
+    "eslint": "^8.56.0",
+    "globals": "^15.0.0",
     "jest": "^28.1.3",
     "jest-environment-jsdom": "^29.6.1",
     "rollup": "^3.26.3",
     "rollup-plugin-mediawiki-gadget": "^1.0.5",
     "ts-jest": "^28.0.7",
     "types-mediawiki": "^1.4.0",
-    "typescript": "^4.7.4"
+    "typescript": "^4.7.4",
+    "typescript-eslint": "^7.6.0"
   },
   "dependencies": {
     "jquery": "^3.6.0",
-    "jsdom": "^20.0.0"
+    "jsdom": "^20.0.0",
+    "tslib": "^2.6.2"
   }
 }