How to crawl folders and check for the presence of a file?

Question

Vue.js

When developing a new application, I came to the fact that the functionality will be divided into modules.
To register all routes from each module, I import them from the specified folder and add them to the existing array:

let baseRoutes = [];
import routeCore from '@/Modules/core/routes/index';
const routes = baseRoutes.concat(routeCore);

import routeModule1 from '@/Modules/module1/routes/index';
const routes = baseRoutes.concat(routeModule1);

import routeModule2 from '@/Modules/module2/routes/index';
const routes = baseRoutes.concat(routeModule2);

//.... и так далее

export default new VueRouter({
    base: '/app/',
    mode: 'history',
    linkActiveClass: 'has-active',
    linkExactActiveClass: 'active',
    routes: routes
});

All route files always lie strictly in the same path of their module folder and are named by the same file.

/Modules/core/routes/index
/Modules/module1/routes/index.js
/Modules/module2/routes/index.js

Tell me, how can I read the contents of the "Modules" folder, so that I can then bypass these folders and connect all the routes?

When working in Laravel Mix, I did it all through shelljs