file "dirname". More details https://ru.hexlet.io/blog/posts/chto-takoe-__dirname-v-javascript

__dirname.js

import { fileURLToPath } from 'url';
import { dirname } from 'path';

export default () => {
    const __filename = fileURLToPath(import.meta.url);
    const __dirname = dirname(__filename);

    return __dirname;
}