[Vinnl]

> we have a problem of having to "de-typescript" a lot of 3rd party code.

What do you mean by this? npm packages at least are already "de-typescripted", in the sense that they're just .js files with accompanying .d.ts files describing the former to people using editors with TypeScript support.

(Also, it feels like you've experienced a weird subset of TypeScript code. It also happens to be an enormous help when doing things "the Javascript way", which is what it's actually designed for. But I can imagine that encountering bad apples can sour the experience for you.)