We're currently trying to document an existing large Angular application and it's daunting. We wrote some meta-code to list all possible routes and attach components to routes (we were hoping Compodoc would help, but it doesn't work well anymore). We have over 700 routes (screens), 1200+ components and 500+ different service calls that query APIs in the back end. If we only look at routes and hope to spend, on averag…
It sounds like you're thinking about the really boring kind of documentation. The kind that no one wants to read and certainly no one wants to write.
In some approaches, the 4 types of documentation are tutorials, how-to guides, technical reference and explanation.
Any per-screen documentation is not tutorial, how-to or explanation. Perhaps it might be technical reference.
The first question then is why are you working on technical reference? Would you get more bang for the buck writing how-to guides?