feat: Add TypeScript definitions (#9693)

types/eslint.config.mjs

@@ -0,0 +1,30 @@
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import expectType from 'eslint-plugin-expect-type/configs/recommended';
+
+export default tseslint.config({
+  files: ['**/*.js', '**/*.ts'],
+  extends: [
+    expectType,
+    eslint.configs.recommended,
+    ...tseslint.configs.recommended,
+    ...tseslint.configs.recommendedTypeChecked,
+  ],
+  plugins: {
+    '@typescript-eslint': tseslint.plugin,
+  },
+  rules: {
+    '@typescript-eslint/no-unused-vars': 'off',
+    '@typescript-eslint/no-unused-expressions': 'off',
+    '@typescript-eslint/no-unsafe-call': 'off',
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-unsafe-return": "off",
+  },
+  languageOptions: {
+    parser: tseslint.parser,
+    parserOptions: {
+      projectService: true,
+      tsconfigRootDir: import.meta.dirname,
+    },
+  },
+});