In uncurried mode, outcome printer swaps curried and uncurries function printing compared to legacy. (#6229)

Author: cristianoc

CHANGELOG.md

@@ -18,6 +18,10 @@
 
 #### :nail_care: Polish
 
+- In uncurried mode, outcome printer swaps curried and uncurries function printing compared to legacy.
+
+#### :nail_care: Polish
+
 - Add location information to duplicate type definition error messages. https://github.com/rescript-lang/rescript-compiler/pull/6199
 - Replace normal module errors with Super_error module, and clean up Super_error. https://github.com/rescript-lang/rescript-compiler/pull/6199
 - `Js.Json.t`, `Js.null` and `Js.nullable` are now untagged variants representing their runtime values, instead of abstract types. https://github.com/rescript-lang/rescript-compiler/pull/6218

jscomp/syntax/src/res_outcome_printer.ml

@@ -319,6 +319,9 @@ let rec printOutTypeDoc (outType : Outcometree.out_type) =
       ]
 
 and printOutArrowType ~uncurried typ =
+  let uncurried =
+    if !Config.uncurried <> Legacy then not uncurried else uncurried
+  in
   let typArgs, typ = collectArrowArgs typ [] in
   let args =
     Doc.join