It really isn't, but I guess that's really context specific. What country and sector are you talking about? For US-SaaS, what you're saying is probably true, but there is a whole world outside of that, and JavaScript is with 99% certainty much more wildly used than TypeScript.

> and it has killed all of the other compile-to-js languages.

Also it hasn't. I've been writing ClojureScript for the last 5 years, almost exclusively. And while the community is small, I wouldn't say it's "dead" or been killed. There are a bunch of compile-to-JS languages that haven't "been killed", besides ClojureScript.

But it serves basically the opposite niche compared to TypeScript.

> The chances of it going out of favour are very slim

Same has been said about everything, always, and it's always not true. Winds change, and surely so shall the winds of TypeScript. Not being able to see that it's possible, will put you at disadvantage.

I'm not sure you're 100% right about it overtaking JS for most of the industry.

I wouldn't recommend it to beginners until they've learned JS because it's a lot of stuff to learn on top of JS to achieve basically the same outcomes (with fewer bugs). Chapter 5 in the Eloquent JavaScript book gets to higher order functions, which in TS means Generics. Nobody needs to learn Generics in Chapter 5 of their programming journey.

You also don't really appreciate how useful TS is until you've battled at least one project in plain JS.

(Arguably you can go a long way without HoF too, but perhaps not if you're hoping to understand other people's code.)