How to make frontend after backend?

Question

Backend

I've been looking for an answer to this question for a long time and I can't find a good answer. I immediately exclude servers on nodejs, everything is fine there.
I myself am engaged in the support of sites, and there are always tasks both on the front and on the backend, that is, absolutely ready-made, long-standing working sites need to be supported in two directions at once. But due to the fact that the sites have already undergone a "build" and a backend, then all the ease of developing the front is gone. Tobezh, we do not edit .scss, but it is not clear where the scattered .css, postscss can no longer be cut, which means either without prefixes or whatever you want, no webpack at all, because it does not sit on php.
I don’t know if there are really normal options for how you can work with both the backend and the front at the same time normally, except on nodejs.

In short, a specific question:
Is there something like webpack but for fullstack development outside of nodejs ?

PS I don't understand the essence, when the application is sawn on reactjs and then the blind is planted on php. How is it even able to be edited normally after the backend?

Answer 1

Tobezh, we do not edit .scss, but it is not clear where the scattered .css,

Well, you are your own evil Pinocchio.
I also support websites. Those of them that I made from scratch have a neat code base (talking about the front). Any changes are made to the source code, the source code is built, then uploaded to the site.
What is the problem?

Answer 2

Is there something like webpack, but for fullstack development outside of nodejs

Webpack is.
The front does not depend on the code base of the back in any way, which means you can use any tools.
At least with backing to php, and backing to .NET, I was able to combine it