sync changes to outcome printer

analysis/src/vendor/res_outcome_printer/res_outcome_printer.ml

@@ -348,7 +348,7 @@ let printPolyVarIdent txt =
       | [], [] -> Doc.nil
       | labels, types ->
         let i = ref 0 in
-        let package = Doc.join ~sep:Doc.line (List.map2 (fun lbl typ ->
+        let package = Doc.join ~sep:Doc.line ((List.map2 [@doesNotRaise]) (fun lbl typ ->
           Doc.concat [
             Doc.text (if i.contents > 0 then "and " else "with ");
             Doc.text lbl;
@@ -376,13 +376,21 @@ let printPolyVarIdent txt =
      let (typArgs, typ) = collectArrowArgs typ [] in
      let args = Doc.join ~sep:(Doc.concat [Doc.comma; Doc.line]) (
        List.map (fun (lbl, typ) ->
-         if lbl = "" then
+         let lblLen = String.length lbl in
+         if lblLen = 0 then
            printOutTypeDoc typ
          else
+           let (lbl, optionalIndicator) =
+             (* the ocaml compiler hardcodes the optional label inside the string of the label in printtyp.ml *)
+             match String.unsafe_get lbl 0 with
+             | '?' -> ((String.sub [@doesNotRaise]) lbl 1 (lblLen - 1) , Doc.text "=?")
+             | _ -> (lbl, Doc.nil)
+           in
            Doc.group (
              Doc.concat [
                Doc.text ("~" ^ lbl ^ ": ");
-               printOutTypeDoc typ
+               printOutTypeDoc typ;
+               optionalIndicator
              ]
            )
        ) typArgs
@@ -468,7 +476,7 @@ let printPolyVarIdent txt =
    and printObjectFields fields rest =
      let dots = match rest with
      | Some non_gen -> Doc.text ((if non_gen then "_" else "") ^ "..")
-     | None -> Doc.nil
+     | None -> if fields = [] then Doc.dot else Doc.nil
      in
      Doc.group (
        Doc.concat [

analysis/tests/src/expected/Div.res.txt

@@ -1,5 +1,5 @@
 Hover tests/src/Div.res 1:10
-{"contents": "```rescript\n(\n  string,\n  ~?props: ReactDOMRe.domProps,\n  array<React.element>,\n) => React.element\n```"}
+{"contents": "```rescript\n(\n  string,\n  ~props: ReactDOMRe.domProps=?,\n  array<React.element>,\n) => React.element\n```"}
 
 Complete tests/src/Div.res 3:3
 [{

analysis/tests/src/expected/Jsx.resi.txt

@@ -1,5 +1,5 @@
 Hover tests/src/Jsx.resi 1:4
-{"contents": "```rescript\n(~first: string, ~?key: string, unit) => {\"first\": string}\n```"}
+{"contents": "```rescript\n(~first: string, ~key: string=?, unit) => {\"first\": string}\n```"}
 
 Hover tests/src/Jsx.resi 4:4
 {"contents": "```rescript\nint\n```"}