Why is the script not working when I compile all of them in laravel?

After I type "npm run dev" in my terminal to compile all the included scripts in the app.js file, nothing seems to be working?? The code below shows part of my code in resources/js/app.js

require('./bootstrap.js');
require('./lightbox-plus-jquery.min.js'); 
require('./script.js');

The scripts included are all located in resources/js/app.js

The code below shows where I have located my script link in app.blade.php

<!-- Scripts -->
<script src="" defer></script>
</body>

Its right before the end of the body tag.