I "built" (it's NodeJs-based) it myself about a year ago (did not bother checking the current source tree) ; can't blame you for not believing it, I did not either.
I had to check with a friend. I do build pretty much everything I use, for kicks but also because I find that's a good metric for the general quality of an open-source project.
Please do send me a blip if you find nothing suspicious of the sort, I'm always happy to reevaluate my beliefs. :)
@Goutte erm, are you sure we're talking about the same app? Telegram Desktop is _not_ NodeJS-based, it is a Qt app written in C++. My previous reply has a link to its source code.
@evacide