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Given examples, Copilot can generate code for extremely rare languages or data structures. For example, it worked fine when I was writing for an obscure scripting language found in a railway simulation game.

to further elaborate, Copilot automatically grabs most recent 20 files with same extension to get code examples. you dont have to do anything special to make this happen. it just improves quietly over time.

Is there documentation or any articles about this? I would love to learn more.

I think he means he uses an obscure programming language and co-pilot still gives him functioning code if he gives a few examples. Not sure if copilot is very context aware where you can feed it an entire code-base, but maybe you can point GPT to read the documentation

As other users said, copilot learns from the rest of your files too.

Thus it works even for relatively obscure stuff like this https://github.com/ts-plus

https://dev.to/effect/the-case-for-ts-18b3

It was pretty straightforward to read. Maybe take another look? You can use a search engine to find this TS-Plus thing they talk about.