Notes on Typescript deep dive: while it's written to give you the impression that it's kept up to date, and each page has a link at the bottom saying updated 4

Notes on Typescript deep dive: while it's written to give you the impression that it's kept up to date, and each page has a link at the bottom saying updated 4 years ago (not too bad), in reality it was written in 2016 and contains a lot of information related to the state of JavaScript in that year - when promises, classes, all the ES6 stuff wasn't a normal part of the library and when compilation to ES3 (!) was still a thing. This means there's a lot of no longer relevant fluff to wade through, and if you learned JavaScript some time in the last <6 years it might be actively confusing. It's a pity because, aside from this, it's very well written.