Use RES instead of "New BuckleScript Syntax" wording

bindings/Bs_platform_api.re

@@ -14,7 +14,7 @@ module Lang = {
 
   let toString = t =>
     switch (t) {
-    | Res => "New BS Syntax"
+    | Res => "RES"
     | Reason => "Reason"
     | OCaml => "OCaml"
     };

bindings/Worker.re

@@ -0,0 +1,33 @@
+type worker;
+
+[@bs.new] external make: string => worker = "Worker";
+
+module type Config = {
+  type fromApp;
+  type fromWorker;
+  let make: unit => worker;
+};
+
+module Make = (Config: Config) => {
+  include Config;
+
+  module App = {
+    [@bs.send] external postMessage: (worker, fromApp) => unit = "postMessage";
+    [@bs.set]
+    external onMessage: (worker, {. "data": fromWorker} => unit) => unit =
+      "onmessage";
+    [@bs.set]
+    external onError: (worker, Js.t('a) => unit) => unit = "onerror";
+    [@bs.send] external terminate: worker => unit = "terminate";
+  };
+
+  module Worker = {
+    type self;
+    [@bs.val] external postMessage: fromWorker => unit = "postMessage";
+    [@bs.set]
+    external onMessage: (self, {. "data": fromApp} => unit) => unit =
+      "onmessage";
+    [@bs.val] external self: self = "self";
+    [@bs.val] external importScripts: string => unit;
+  };
+};

re_pages/Playground.re

@@ -388,12 +388,7 @@ module ErrorPane = {
         </div>
       </div>;
     | Nothing =>
-      let syntax =
-        switch (targetLang) {
-        | Api.Lang.OCaml => "OCaml"
-        | Res => "New BuckleScript"
-        | Reason => "Reason"
-        };
+      let syntax = Api.Lang.toString(targetLang);
       <PreWrap>
         {j|This playground is now running on compiler version $compilerVersion with the $syntax syntax|j}
         ->s