Changes for compatibility with ES2022 transpiler

Tools/objj2objcskeleton/objj2objcskeleton

@@ -4,7 +4,7 @@
 
 var fs = require("fs"),
     acorn = require("objj-parser"),
-    walk = require("objj-parser/util/walk"),
+    walk = require("acorn-walk"),
     stream = ObjectiveJ.term;
 
 function main(args)
@@ -37,6 +37,8 @@ function raise(pos, message)
     throw syntaxError;
 }
 
+function ignore(_node, _st, _c) {}
+
 var errors = [],
     xcc = walk.make(
     {
@@ -112,7 +114,17 @@ var errors = [],
                 else
                     raise(node.loc.start, "Action methods must have exactly one parameter");
             }
-        }
+        },
+        TypeDefStatement: ignore,
+        ClassStatement: ignore,
+        MessageSendExpression: ignore,
+        GlobalStatement: ignore,
+        ProtocolDeclarationStatement: ignore,
+        ArrayLiteral: ignore,
+        Reference: ignore,
+        DictionaryLiteral: ignore,
+        Dereference: ignore,
+        ImportStatement: ignore
     }
 );