build: migrate to ESlint v8+

Author: gnikit

.eslintignore

@@ -47,7 +47,7 @@
       "script": "lint",
       "problemMatcher": "$eslint-stylish",
       "label": "npm: lint",
-      "detail": "eslint . --ext .ts,.tsx"
+      "detail": "eslint ."
     }
   ]
 }

.eslintrc.js

@@ -9,7 +9,7 @@ src/**
 **/*.ts
 .gitignore
 **/tsconfig*.json
-**/.eslintrc.json
+**/eslint.config.mjs.mjs
 .husky/
 .github/
 .editorconfig

.vscode/tasks.json

@@ -0,0 +1,62 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { fixupPluginRules, includeIgnoreFile } from '@eslint/compat';
+import { FlatCompat } from '@eslint/eslintrc';
+import js from '@eslint/js';
+import typescriptEslint from '@typescript-eslint/eslint-plugin';
+import tsParser from '@typescript-eslint/parser';
+import _import from 'eslint-plugin-import';
+import jsdoc from 'eslint-plugin-jsdoc';
+import prettier from 'eslint-plugin-prettier';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+const gitignorePath = path.resolve(__dirname, '.gitignore');
+
+export default [
+  {
+    ignores: ['**/*.js', '**/test-resources'],
+  },
+  includeIgnoreFile(gitignorePath),
+  ...compat.extends('eslint:recommended', 'plugin:@typescript-eslint/recommended'),
+  {
+    files: ['**/*.ts', '**/*.tsx'],
+
+    plugins: {
+      '@typescript-eslint': typescriptEslint,
+      jsdoc,
+      'import': fixupPluginRules(_import),
+      prettier,
+    },
+
+    languageOptions: {
+      parser: tsParser,
+    },
+
+    rules: {
+      'semi': [2, 'always'],
+      '@typescript-eslint/no-unused-vars': 0,
+      '@typescript-eslint/no-explicit-any': 0,
+      '@typescript-eslint/explicit-module-boundary-types': 0,
+      '@typescript-eslint/no-non-null-assertion': 0,
+
+      'import/order': [
+        'error',
+        {
+          'alphabetize': {
+            order: 'asc',
+          },
+
+          'newlines-between': 'always',
+          'groups': ['builtin', 'external', 'internal', 'parent', 'sibling', 'index'],
+        },
+      ],
+    },
+  },
+];

.vscodeignore

@@ -740,14 +740,17 @@
     "test:grammar": "npm run test:grammar-free && npm run test:grammar-fixed",
     "test:grammar-update": "npm run test:grammar-free -- -u && npm run test:grammar-fixed -- -u",
     "posttest": "npm run format",
-    "lint": "eslint . --ext .ts,.tsx",
+    "lint": "eslint .",
     "lint-fix": "npm run lint -- --fix",
     "format": "prettier --write \"src/**/*.{ts,json}\" \"test/**/*.ts\" \"syntaxes/**/*.json\" \"snippets/**/*.json\" \"./**/*.{md,json,yaml,yml}\"",
     "prepare": "husky install",
     "pre-commit": "lint-staged",
     "coverage": "c8 --clean npm run test"
   },
   "devDependencies": {
+    "@eslint/compat": "^1.2.6",
+    "@eslint/eslintrc": "^3.2.0",
+    "@eslint/js": "^9.20.0",
     "@types/glob": "^8.0.1",
     "@types/mocha": "^10.0.6",
     "@types/node": "^22.13.0",