JSX v4 record-based representation for lowercase

CHANGELOG.md

@@ -39,6 +39,10 @@
 
 - Functions with consecutive dots now print as multiple arrow functions like in JavaScript.
 
+#### :nail_care Polish
+
+- Change the internal representation of props for the lowercase components to record. https://github.com/rescript-lang/syntax/pull/665
+
 ## ReScript 10.0
 
 - Fix printing for inline nullary functor types [#477](https://github.com/rescript-lang/syntax/pull/477)

cli/reactjs_jsx_v4.ml

@@ -27,7 +27,8 @@ let getLabel str =
   | Optional str | Labelled str -> str
   | Nolabel -> ""
 
-let optionalAttr = [({txt = "ns.optional"; loc = Location.none}, PStr [])]
+let optionalAttr = ({txt = "ns.optional"; loc = Location.none}, PStr [])
+let optionalAttrs = [optionalAttr]
 
 let constantString ~loc str =
   Ast_helper.Exp.constant ~loc (Pconst_string (str, None))
@@ -211,7 +212,7 @@ let recordFromProps ~loc ~removeKey callArguments =
     let id = getLabel arg_label in
     if isOptional arg_label then
       ( {txt = Lident id; loc = pexp_loc},
-        {pexpr with pexp_attributes = optionalAttr} )
+        {pexpr with pexp_attributes = optionalAttrs} )
     else ({txt = Lident id; loc = pexp_loc}, pexpr)
   in
   let fields = props |> List.map processProp in
@@ -288,9 +289,9 @@ let makeLabelDecls ~loc namedTypeList =
   namedTypeList
   |> List.map (fun (isOptional, label, _, interiorType) ->
          if label = "key" then
-           Type.field ~loc ~attrs:optionalAttr {txt = label; loc} interiorType
+           Type.field ~loc ~attrs:optionalAttrs {txt = label; loc} interiorType
          else if isOptional then
-           Type.field ~loc ~attrs:optionalAttr {txt = label; loc}
+           Type.field ~loc ~attrs:optionalAttrs {txt = label; loc}
              (Typ.var @@ safeTypeFromValue @@ Labelled label)
          else
            Type.field ~loc {txt = label; loc}
@@ -462,7 +463,7 @@ let transformLowercaseCall3 ~config mapper jsxExprLoc callExprLoc attrs
       | Exact children ->
         [
           ( labelled "children",
-            Exp.apply ~attrs:optionalAttr
+            Exp.apply ~attrs:optionalAttrs
               (Exp.ident
                  {
                    txt = Ldot (Lident "ReactDOM", "someElement");
@@ -543,19 +544,14 @@ let transformLowercaseCall3 ~config mapper jsxExprLoc callExprLoc attrs
           (nolabel, childrenExpr);
         ]
       | nonEmptyProps ->
-        let propsCall =
-          Exp.apply
-            (Exp.ident
-               {loc = Location.none; txt = Ldot (Lident "ReactDOM", "domProps")})
-            (nonEmptyProps
-            |> List.map (fun (label, expression) ->
-                   (label, mapper.expr mapper expression)))
+        let propsRecord =
+          recordFromProps ~loc:Location.none ~removeKey:false nonEmptyProps
         in
         [
           (* "div" *)
           (nolabel, componentNameExpr);
           (* ReactDOM.domProps(~className=blabla, ~foo=bar, ()) *)
-          (labelled "props", propsCall);
+          (labelled "props", propsRecord);
           (* [|moreCreateElementCallsHere|] *)
           (nolabel, childrenExpr);
         ]
@@ -688,14 +684,14 @@ let argToType ~newtypes ~(typeConstraints : core_type option) types
   in
   match (type_, name, default) with
   | Some type_, name, _ when isOptional name ->
-    (true, getLabel name, [], {type_ with ptyp_attributes = optionalAttr})
+    (true, getLabel name, [], {type_ with ptyp_attributes = optionalAttrs})
     :: types
   | Some type_, name, _ -> (false, getLabel name, [], type_) :: types
   | None, name, _ when isOptional name ->
     ( true,
       getLabel name,
       [],
-      Typ.var ~loc ~attrs:optionalAttr (safeTypeFromValue name) )
+      Typ.var ~loc ~attrs:optionalAttrs (safeTypeFromValue name) )
     :: types
   | None, name, _ when isLabelled name ->
     (false, getLabel name, [], Typ.var ~loc (safeTypeFromValue name)) :: types
@@ -1052,7 +1048,7 @@ let transformStructureItem ~config mapper item =
                      {
                        patternWithoutConstraint with
                        ppat_attributes =
-                         (if isOptional arg_label then optionalAttr else [])
+                         (if isOptional arg_label then optionalAttrs else [])
                          @ pattern.ppat_attributes;
                      } )
                   :: patternsWithLabel)
@@ -1068,7 +1064,7 @@ let transformStructureItem ~config mapper item =
                        {
                          pattern with
                          ppat_attributes =
-                           optionalAttr @ pattern.ppat_attributes;
+                           optionalAttrs @ pattern.ppat_attributes;
                        } )
                     :: patternsWithNolabel)
                     expr

tests/ppx/react/expected/forwardRef.res.txt

@@ -82,12 +82,11 @@ module V4C = {
         [
           ReactDOM.createDOMElementVariadic(
             "input",
-            ~props=ReactDOM.domProps(
-              ~type_="text",
-              ~className?,
-              ~ref=?{Js.Nullable.toOption(ref)->Belt.Option.map(React.Ref.domRef)},
-              (),
-            ),
+            ~props={
+              type_: "text",
+              ?className,
+              ref: ?Js.Nullable.toOption(ref)->Belt.Option.map(React.Ref.domRef),
+            },
             [],
           ),
           children,

tests/ppx/react/expected/lowercases.res.txt

@@ -0,0 +1,15 @@
+@@jsxConfig({version: 4, mode: "classic"})
+
+let _ = ReactDOM.createDOMElementVariadic("div", [])
+let _ = ReactDOM.createDOMElementVariadic("div", ~props={key: "k"}, [])
+let _ = ReactDOM.createDOMElementVariadic("div", ~props={x: x}, [])
+let _ = ReactDOM.createDOMElementVariadic(
+  "div",
+  [ReactDOM.createDOMElementVariadic("p", [{React.string(x)}])],
+)
+let _ = ReactDOM.createDOMElementVariadic("div", ~props=str, [])
+let _ = ReactDOM.createDOMElementVariadic("div", ~props={...str, x: "x"}, [])
+
+// syntax error
+// let _ = <div x="x" {...str} />
+// let _ = <div {...str} {...str} />

tests/ppx/react/lowercases.res

@@ -0,0 +1,12 @@
+@@jsxConfig({version:4, mode:"classic"})
+
+let _ = <div />
+let _ = <div key="k" />
+let _ = <div x />
+let _ = <div><p>{React.string(x)}</p></div>
+let _ = <div {...str} />
+let _ = <div {...str} x="x" />
+
+// syntax error
+// let _ = <div x="x" {...str} />
+// let _ = <div {...str} {...str} />