Spring cleaning: Frontend (#6127)

* Spring cleaning: no cppo on frontend.

* format

Author: cristianoc

jscomp/frontend/.ocamlformat

@@ -1,27 +1,28 @@
-let add_promise_type ?(loc=Location.none) ~async (result : Parsetree.expression) =
+let add_promise_type ?(loc = Location.none) ~async
+    (result : Parsetree.expression) =
   if async then
     let unsafe_async =
       Ast_helper.Exp.ident ~loc
-        { txt = Ldot (Ldot (Lident "Js", "Promise"), "unsafe_async"); loc }
+        {txt = Ldot (Ldot (Lident "Js", "Promise"), "unsafe_async"); loc}
     in
-    Ast_helper.Exp.apply ~loc unsafe_async [ (Nolabel, result) ]
+    Ast_helper.Exp.apply ~loc unsafe_async [(Nolabel, result)]
   else result
 
 let add_async_attribute ~async (body : Parsetree.expression) =
   if async then
     {
       body with
       pexp_attributes =
-        ({ txt = "res.async"; loc = Location.none }, PStr [])
+        ({txt = "res.async"; loc = Location.none}, PStr [])
         :: body.pexp_attributes;
     }
   else body
 
 let rec add_promise_to_result ~loc (e : Parsetree.expression) =
   match e.pexp_desc with
   | Pexp_fun (label, eo, pat, body) ->
-      let body = add_promise_to_result ~loc body in
-      { e with pexp_desc = Pexp_fun (label, eo, pat, body) }
+    let body = add_promise_to_result ~loc body in
+    {e with pexp_desc = Pexp_fun (label, eo, pat, body)}
   | _ -> add_promise_type ~loc ~async:true e
 
 let make_function_async ~async (e : Parsetree.expression) =