How to properly build js on Gulp?

Question

npm

I have 10 folders with blocks, each contains a pug file, scss and js. So here's how to properly style js for each of the blocks?
Is it correct to do this:

$(document).ready(function () {
   ...
});

In this case, after building 10 files, there will be something like:

$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});$(document).ready(function(){...});

Is it correct? And if not, how to do it right?