How are finished projects updated?

Question

Sass

Hello!
I'm doing myself a small project, so to speak, I'm training. I'm making a site using jade, sass and js, I'm putting it all together with gulp. The output is files with minified data, which after the pens are uploaded to some server and a question arose.
How, after the work on the project is completed, is it updated, because this site cannot be forever unchanged, it will still need to change something, and then it will again be necessary to flatter the source, edit, recompile and upload to the server?
So I decided to ask knowledgeable people who have already made more than one web project and support them.

Answer 1

will it be necessary to again flatter the source, edit, recompile and upload to the server?

bingo!

Answer 2

After the work on the project, the sources are not deleted) if necessary, make changes, edit the sources and compile everything again into minified files with the same gulp and upload them to the server :)

Answer 3

if you want to make your life easier, then do the union and minification not in gulp, but using the framework or cms. Right now, there are plugins for everyone, where you simply connect all css to the document via < link href, and < script src= all js, and at the output you get 2 files merged and minified.