I am nothingismagick - France-based systems architect, developer & designer. I actually used Photoshop 1.0 in the 90's, Gimp / Inkscape in the 00's and moved to the command-line in the 10's to make generative designs.
I am a core team member of the Quasar Framework, and am currently looking into ways to create two-way bindings between design software (like Affinity Designer) and auto-generating code blocks using a single-source of truth. For an idea about a project that comes close to what I mean (albeit using SKETCH), check this out: https://github.com/seek-oss/html-sketchapp-cli
Any tips or guidance on API interfacing with Designer, pushing commits to a GIT repository and autogeneration of Assets from HTML would be really great.