So I made a working version. And then I understood that I don't like how product works: I don't like a minute delay between posted and forwared message. I also didn't like that cost for many users on top of lambdas would be too high. I also didn't like that node.js don't support multi-threading and can't launch several TDlib instances.
I decided to make a server that holds all TDlib processes. It had to be a JVM (Java) based solution as Java has the best integration with TDlib.