should we support plumatic style defn syntax (?)

[jasonjckn]

Plumatic style function syntax :- can be found in a few libraries
https://github.com/plumatic/schema#beyond-type-hints
https://github.com/metosin/malli/blob/master/docs/function-schemas.md#function-schema-metadata
https://github.com/gnl/ghostwheel

is there any desire to support this out-of-the-box? it might be challenging to add an user configuration mechanism for it , and there's not a lot of downside to understanding the optional syntax. This is a qualitatively distinct problem than supporting different function definition aliases 'defn', which is more amenable to user config.

:- appears both to denote function return type, as well as function parameter(s) type, the only place where support needs to be added is the function return type as far as I can tell.

it's a trivial change in clojure-ts--docstring-query , I'm using this rough code right now, but probably needs a :match expression the literal :-

Expected behavior

Actual behavior

Steps to reproduce the problem

(defn foobar :- long?
  "comment string"
  [a :- long?]
  :do-something)

Environment & Version information

clojure-ts-mode version

0.2.0

Emacs version

30.x

[bbatsov]

I think it's best to avoid syntax that's not from the core language, as ones we add support for something it's a slippery slope from there. With TreeSitter it's easy to add additional font-locking features, and I think that's what people looking for additional font-locking should be doing. The indentation rules are slightly trickier to extend, but that's totally doable.