add reactCompat default to file opts

lib/6to5/file.js

@@ -48,6 +48,7 @@ File.normaliseOptions = function (opts) {
 
   _.defaults(opts, {
     experimental: false,
+    reactCompat:  false,
     playground:   false,
     whitespace:   true,
     moduleIds:    opts.amdModuleIds || false,

lib/6to5/transformation/transformers/react.js

@@ -42,7 +42,7 @@ var isTag = function(tagName) {
 
 exports.XJSOpeningElement = {
   exit: function (node, parent, file) {
-    var reactCompat = file.opts && file.opts.reactCompat;
+    var reactCompat = file.opts.reactCompat;
     var tagExpr = node.name;
     var args = [];
 
@@ -123,10 +123,10 @@ exports.XJSOpeningElement = {
           args
         );
       }
+    } else {
+      tagExpr = t.memberExpression(t.identifier("React"), t.identifier("createElement"));
+      return t.callExpression(tagExpr, args);
     }
-
-    tagExpr = t.memberExpression(t.identifier("React"), t.identifier("createElement"));
-    return t.callExpression(tagExpr, args);
   }
 };