[antris]

>TypeScript definitions don't block and VS Code does not warn for `indices.forEach(console.log)`

Sure, it's a valid way of logging all the arguments that pass through forEach. I don't see a problem here?

>When using eta-reduction in Javascript both functions and all their (optional) arguments have to be known by the programmer and future programmers, instead of needing to know only the argument-slots being used by (x,y,...) => ...

My VSCode setup shows all arguments of functions automatically. Also, I always avoid optional arguments in my code and writing functions that take in a variable amount of arguments or arguments of different types. I always refactor these out of my codebase.

>Additionally, the way `this` in javascript works (or doesn't for a lot of callbacks) also pushes against using eta-reduction.

`this` is another smell that I always avoid using in my codebase, and refactor code that uses it to work without `this`. I thought `this` being harmful is common knowledge?