asyncjs breaks with bare `return` when return type is not void

[metagn]

Nim Version

devel

Description

import std/asyncjs

proc foo(): Future[int] {.async.} =
  result = 123
  return

Current Output

a.nim(3, 27) template/generic instantiation of `async` from here
lib/js/asyncjs.nim(87, 26) Error: type mismatch: got 'None' for 'jsResolve' but expected 'Future[system.int]'

Expected Output

works

Known Workarounds

use return result

Additional Information

No response

[metagn]

You also cannot access the result variable at all other than returning. i.e.

result = result + 123

doesn't work. Could be a separate issue though. For this the workaround is adding var result = 0.

[litlighilit]

not only.

expression as returning also doesn't work:

import std/asyncjs
proc f: Future[int]{.async.} = 1

tho this is another issue.

In short, amony nim's three returning methods,

only using return keyword works for asyncjs backend currently