diff --git a/lib/6to5/transformers/classes.js b/lib/6to5/transformers/classes.js
index 502b9859d1..08163a1681 100644
--- a/lib/6to5/transformers/classes.js
+++ b/lib/6to5/transformers/classes.js
@@ -37,25 +37,23 @@ var buildClassBody = function (body, className, superName, node) {
   var mutatorMap = {};
 
   var classBody = node.body.body;
-  _.each(classBody, function (bodyNode) {
-    if (bodyNode.type !== "MethodDefinition") return;
-
-    var methodName = bodyNode.key.name;
-    var method     = bodyNode.value;
+  _.each(classBody, function (node) {
+    var methodName = node.key.name;
+    var method     = node.value;
 
     replaceInstanceSuperReferences(superName, method);
 
     if (methodName === "constructor") {
-      if (bodyNode.kind === "") {
+      if (node.kind === "") {
         addConstructor(body[0], method);
       } else {
         throw new Error("unknown kind for constructor method");
       }
     } else {
-      if (bodyNode.kind === "") {
+      if (node.kind === "") {
         addInstanceMethod(body, className, methodName, method);
       } else {
-        util.pushMutatorMap(mutatorMap, methodName, bodyNode.kind, bodyNode);
+        util.pushMutatorMap(mutatorMap, methodName, node.kind, node);
       }
     }
   });
diff --git a/lib/6to5/transformers/modules.js b/lib/6to5/transformers/modules.js
index 63d37028e7..3dfda826d1 100644
--- a/lib/6to5/transformers/modules.js
+++ b/lib/6to5/transformers/modules.js
@@ -75,8 +75,6 @@ exports.ExportDeclaration = function (node) {
           KEY: declar.id,
           VALUE: declar
         }, true));
-      } else {
-        throw new Error("unsupported export declaration type " + declar.type);
       }
     }
   }
diff --git a/lib/6to5/traverse/index.js b/lib/6to5/traverse/index.js
index 4bcaa2b67f..6aa1f28fed 100644
--- a/lib/6to5/traverse/index.js
+++ b/lib/6to5/traverse/index.js
@@ -72,18 +72,3 @@ traverse.replace = function (node, callback) {
     if (result != null) obj[key] = result;
   });
 };
-
-traverse.replace.shallow = function (node, callback) {
-  traverse(node, function (node, parent, obj, key) {
-    var result = callback(node, parent);
-    if (result != null) obj[key] = result;
-    return false;
-  });
-};
-
-traverse.shallow = function (node, callback) {
-  traverse(node, function () {
-    callback.apply(this, arguments);
-    return false;
-  });
-};