[unstable]

> while the whole thing should be on the editor's side.

This.

I'd prefer using my own preferences instead of using a dumb formatter like prettier. Who cares some other dev in your team prefers 2 chars indentation? It should be an editor preference, not applied to source code.

Personally I would also prefer the IDE to do type checking as well so we can get rid of the TypeScript misery, but that's another discussion.