[Dr_tldr]

It's the classic "not invented here" syndrome, but on the level of languages. It's not enough to be able to have strong types in Javascript, they want people to stop writing Javascript, scrap the entire ecosystem, create all new browsers on every platform, and only write in their strongly typed language that's just as flawed as Javascript.

[k__]

He simply wrote that TS isn't on the edge, without getting personal.

I astouned what some people read into a perfectly reasonable critique...

What about PureScript, it's way beyond TypeScript and still compiles and interacts with JavaScript.

[catnaroek]

What I find very funny about PureScript is how it has these super-fancy types, designed from the ground up to express things like semigroupoids, lenses and profunctor-based optics... yet it doesn't have a numeric type better than JavaScript's good old floating points.

Just to be clear, this isn't meant as criticism, since I absolutely love how Haskell (and now PureScript too!) exploit algebraic structures to make code more reusable and robust. But the contrast between “can express fancy structures precisely” and “doesn't have precise arithmetic” is very amusing.