I write them digitally.
I use Twine: https://twinery.org/
This is mainly for choose our own adventure stories though.
Also code editor? You mean like you're gonna make your own program to help with writing your story or you're just writing your story in the editor? Not sure what you mean, but that does sound cool.
Code editors are just fancy text editors.
If you're interested, this guy wrote an entire article about why he prefers code editors for writing stories:
https://jaypenner.com/blog/writing-novels-and-non-fiction-with-visual-studio-cod...
