Migrate ESLint config to new format

eslint.config.mjs

@@ -0,0 +1,89 @@
+import jest from "eslint-plugin-jest";
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import globals from "globals";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+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
+});
+
+export default [{
+    ignores: ["**/dist/", "**/lib/", "**/node_modules/", "**/jest.config.js"],
+}, ...compat.extends("plugin:github/recommended"), {
+    plugins: {
+        jest,
+        "@typescript-eslint": typescriptEslint,
+    },
+
+    languageOptions: {
+        globals: {
+            ...globals.node,
+            ...jest.environments.globals.globals,
+        },
+
+        parser: tsParser,
+        ecmaVersion: 9,
+        sourceType: "module",
+
+        parserOptions: {
+            project: "./tsconfig.json",
+        },
+    },
+
+    rules: {
+        "i18n-text/no-en": "off",
+        "eslint-comments/no-use": "off",
+        "import/no-namespace": "off",
+        "no-unused-vars": "off",
+        "@typescript-eslint/no-unused-vars": "error",
+
+        "@typescript-eslint/explicit-member-accessibility": ["error", {
+            accessibility: "no-public",
+        }],
+
+        "@typescript-eslint/no-require-imports": "error",
+        "@typescript-eslint/array-type": "error",
+        "@typescript-eslint/await-thenable": "error",
+        "@typescript-eslint/ban-ts-comment": "error",
+        camelcase: "off",
+        "@typescript-eslint/consistent-type-assertions": "error",
+
+        "@typescript-eslint/explicit-function-return-type": ["error", {
+            allowExpressions: true,
+        }],
+
+        "@typescript-eslint/func-call-spacing": ["error", "never"],
+        "@typescript-eslint/no-array-constructor": "error",
+        "@typescript-eslint/no-empty-interface": "error",
+        "@typescript-eslint/no-explicit-any": "error",
+        "@typescript-eslint/no-extraneous-class": "error",
+        "@typescript-eslint/no-for-in-array": "error",
+        "@typescript-eslint/no-inferrable-types": "error",
+        "@typescript-eslint/no-misused-new": "error",
+        "@typescript-eslint/no-namespace": "error",
+        "@typescript-eslint/no-non-null-assertion": "warn",
+        "@typescript-eslint/no-unnecessary-qualifier": "error",
+        "@typescript-eslint/no-unnecessary-type-assertion": "error",
+        "@typescript-eslint/no-useless-constructor": "error",
+        "@typescript-eslint/no-var-requires": "error",
+        "@typescript-eslint/prefer-for-of": "warn",
+        "@typescript-eslint/prefer-function-type": "warn",
+        "@typescript-eslint/prefer-includes": "error",
+        "@typescript-eslint/prefer-string-starts-ends-with": "error",
+        "@typescript-eslint/promise-function-async": "error",
+        "@typescript-eslint/require-array-sort-compare": "error",
+        "@typescript-eslint/restrict-plus-operands": "error",
+        semi: "off",
+        "@typescript-eslint/semi": ["error", "never"],
+        "@typescript-eslint/type-annotation-spacing": "error",
+        "@typescript-eslint/unbound-method": "error",
+    },
+}];