I don’t have full time Internet access. I pop into a library periodically. So I have found it useful to fetch the lemmyverse dataset and import it. Takes just a few seconds to fetch the whole dataset. Then when I am offline I search the DB to decide where to post, and write my posts offline.

I’m trying to grasp what you are suggesting. Do you mean I write a program to reach out to each instance and harvest the data? I think there are around 150 lemmy instances. I’m not sure how quickly that can be done, or if it would be welcome. When I visit slrpnk.net using my browser, there is an anti-bot check which takes a few seconds. I don’t imagine cURL or the like would get past that, which I suspect is some javascript code that must be executed.

In your repo I see routes/community.ts and nodes.ts. But therein I do not see a list of instances or communities to visit. Is ts for typescript? That lang is unknown to me.