diff --git a/lib/6to5/modules/amd.js b/lib/6to5/modules/amd.js
index 073cd596a6..5cc573f7ca 100644
--- a/lib/6to5/modules/amd.js
+++ b/lib/6to5/modules/amd.js
@@ -2,6 +2,7 @@ module.exports = AMDFormatter;
 
 var CommonJSFormatter = require("./common");
 var util              = require("../util");
+var t                 = require("../types");
 var b                 = require("../builders");
 var _                 = require("lodash");
 
@@ -51,7 +52,7 @@ AMDFormatter.prototype.import = function (node) {
 };
 
 AMDFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
-  var key = util.getSpecifierName(specifier);
+  var key = t.getSpecifierName(specifier);
   var id  = specifier.id;
 
   // import foo from "foo";
diff --git a/lib/6to5/modules/common.js b/lib/6to5/modules/common.js
index 8cd1013c65..0fbb851c7c 100644
--- a/lib/6to5/modules/common.js
+++ b/lib/6to5/modules/common.js
@@ -1,6 +1,7 @@
 module.exports = CommonJSFormatter;
 
 var util = require("../util");
+var t    = require("../types");
 var b    = require("../builders");
 
 function CommonJSFormatter(file) {
@@ -15,7 +16,7 @@ CommonJSFormatter.prototype.import = function (node, nodes) {
 };
 
 CommonJSFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
-  var variableName = util.getSpecifierName(specifier);
+  var variableName = t.getSpecifierName(specifier);
 
   // import foo from "foo";
   if (specifier.default) {
@@ -38,7 +39,7 @@ CommonJSFormatter.prototype.export = function (node, nodes) {
   var declar = node.declaration;
 
   if (node.default) {
-    util.ensureExpressionType(declar);
+    t.ensureExpressionType(declar);
 
     nodes.push(util.template("exports-default", {
       VALUE: declar
@@ -65,7 +66,7 @@ CommonJSFormatter.prototype.export = function (node, nodes) {
 };
 
 CommonJSFormatter.prototype._exportSpecifier = function (getRef, specifier, node, nodes) {
-  var variableName = util.getSpecifierName(specifier);
+  var variableName = t.getSpecifierName(specifier);
 
   if (node.source) {
     if (specifier.type === "ExportBatchSpecifier") {
diff --git a/lib/6to5/transformer.js b/lib/6to5/transformer.js
index 77123b64be..3455588d07 100644
--- a/lib/6to5/transformer.js
+++ b/lib/6to5/transformer.js
@@ -1,6 +1,7 @@
 module.exports = Transformer;
 
 var traverse = require("./traverse");
+var t        = require("./types");
 var _        = require("lodash");
 
 function Transformer(key, transformer) {
@@ -34,7 +35,7 @@ Transformer.prototype.transform = function (file) {
   var build = function (exit) {
     return function (node, parent) {
       // add any node type aliases that exist
-      var types = [node.type].concat(traverse.aliases[node.type] || []);
+      var types = [node.type].concat(t.aliases[node.type] || []);
 
       var fns = transformer.all;
 
diff --git a/lib/6to5/transformers/_alias-functions.js b/lib/6to5/transformers/_alias-functions.js
index 77928084ce..36e787dec2 100644
--- a/lib/6to5/transformers/_alias-functions.js
+++ b/lib/6to5/transformers/_alias-functions.js
@@ -1,5 +1,5 @@
 var traverse = require("../traverse");
-var util     = require("../util");
+var t        = require("../types");
 var b        = require("../builders");
 
 var go = function (getBody, node, file) {
@@ -19,7 +19,7 @@ var go = function (getBody, node, file) {
   traverse(node, function (node) {
     var _aliasFunction = node._aliasFunction;
     if (!_aliasFunction) {
-      if (traverse.isFunction(node)) {
+      if (t.isFunction(node)) {
         // stop traversal of this node as it'll be hit again by this transformer
         return false;
       } else {
@@ -30,7 +30,7 @@ var go = function (getBody, node, file) {
     // traverse all child nodes of this function and find arguments and this
     traverse(node, function (node, parent) {
       if (_aliasFunction === "arrows") {
-        if (traverse.isFunction(node) && node._aliasFunction !== "arrows") {
+        if (t.isFunction(node) && node._aliasFunction !== "arrows") {
           return false;
         }
       }
@@ -45,7 +45,7 @@ var go = function (getBody, node, file) {
         return;
       }
 
-      if (util.isReferenced(node, parent)) return getId();
+      if (t.isReferenced(node, parent)) return getId();
     });
 
     return false;
@@ -78,7 +78,7 @@ exports.Program = function (node, parent, file) {
 exports.FunctionDeclaration =
 exports.FunctionExpression = function (node, parent, file) {
   go(function () {
-    util.ensureBlock(node);
+    t.ensureBlock(node);
     return node.body.body;
   }, node, file);
 };
diff --git a/lib/6to5/transformers/_comments.js b/lib/6to5/transformers/_comments.js
index 14ea290d23..3a008f1108 100644
--- a/lib/6to5/transformers/_comments.js
+++ b/lib/6to5/transformers/_comments.js
@@ -1,6 +1,3 @@
-var traverse = require("../traverse");
-var _        = require("lodash");
-
-module.exports = function (ast) {
+module.exports = function () {
 
 };
diff --git a/lib/6to5/transformers/arrow-functions.js b/lib/6to5/transformers/arrow-functions.js
index feebb5213e..d63bbad2d9 100644
--- a/lib/6to5/transformers/arrow-functions.js
+++ b/lib/6to5/transformers/arrow-functions.js
@@ -1,7 +1,7 @@
-var util = require("../util");
+var t = require("../types");
 
 exports.ArrowFunctionExpression = function (node) {
-  util.ensureBlock(node);
+  t.ensureBlock(node);
 
   node._aliasFunction = "arrows";
   node.expression = false;
diff --git a/lib/6to5/transformers/default-parameters.js b/lib/6to5/transformers/default-parameters.js
index 591a16a4df..a3696ceb87 100644
--- a/lib/6to5/transformers/default-parameters.js
+++ b/lib/6to5/transformers/default-parameters.js
@@ -1,9 +1,10 @@
 var util = require("../util");
+var t    = require("../types");
 var _    = require("lodash");
 
 exports.Function = function (node) {
   if (!node.defaults.length) return;
-  util.ensureBlock(node);
+  t.ensureBlock(node);
 
   _.each(node.defaults, function (def, i) {
     if (!def) return;
diff --git a/lib/6to5/transformers/destructuring.js b/lib/6to5/transformers/destructuring.js
index 84d2335a8e..62f4ed757f 100644
--- a/lib/6to5/transformers/destructuring.js
+++ b/lib/6to5/transformers/destructuring.js
@@ -1,7 +1,6 @@
-var traverse = require("../traverse");
-var util     = require("../util");
-var b        = require("../builders");
-var _        = require("lodash");
+var b = require("../builders");
+var t = require("../types");
+var _ = require("lodash");
 
 var buildVariableAssign = function (kind, id, init) {
   if (kind === false) {
@@ -30,7 +29,7 @@ var pushObjectPattern = function (kind, nodes, pattern, parentId) {
     var pattern2   = prop.value;
     var patternId2 = b.memberExpression(parentId, prop.key, false);
 
-    if (traverse.isPattern(pattern2)) {
+    if (t.isPattern(pattern2)) {
       push(kind, nodes, pattern2, patternId2);
     } else {
       nodes.push(buildVariableAssign(kind, pattern2, patternId2));
@@ -67,7 +66,7 @@ exports.ForOfStatement = function (node, parent, file) {
   if (declar.type !== "VariableDeclaration") return;
 
   var pattern = declar.declarations[0].id;
-  if (!traverse.isPattern(pattern)) return;
+  if (!t.isPattern(pattern)) return;
 
   var key = b.identifier(file.generateUid("ref"));
   node.left = b.variableDeclaration(declar.kind, [
@@ -78,7 +77,7 @@ exports.ForOfStatement = function (node, parent, file) {
 
   push(declar.kind, nodes, pattern, key);
 
-  util.ensureBlock(node);
+  t.ensureBlock(node);
 
   var block = node.body;
   block.body = nodes.concat(block.body);
@@ -90,7 +89,7 @@ exports.Function = function (node, parent, file) {
   var hasDestructuring = false;
 
   node.params = node.params.map(function (pattern) {
-    if (!traverse.isPattern(pattern)) return pattern;
+    if (!t.isPattern(pattern)) return pattern;
 
     hasDestructuring = true;
     var parentId = b.identifier(file.generateUid("ref"));
@@ -100,7 +99,7 @@ exports.Function = function (node, parent, file) {
 
   if (!hasDestructuring) return;
 
-  util.ensureBlock(node);
+  t.ensureBlock(node);
 
   var block = node.body;
   block.body = nodes.concat(block.body);
@@ -110,7 +109,7 @@ exports.ExpressionStatement = function (node, parent, file) {
   var expr = node.expression;
   if (expr.type !== "AssignmentExpression") return;
 
-  if (!traverse.isPattern(expr.left)) return;
+  if (!t.isPattern(expr.left)) return;
 
   var nodes = [];
 
@@ -131,7 +130,7 @@ exports.VariableDeclaration = function (node, parent, file) {
 
   var hasPattern = false;
   _.each(node.declarations, function (declar) {
-    if (traverse.isPattern(declar.id)) {
+    if (t.isPattern(declar.id)) {
       hasPattern = true;
       return false;
     }
@@ -141,7 +140,7 @@ exports.VariableDeclaration = function (node, parent, file) {
   _.each(node.declarations, function (declar) {
     var patternId = declar.init;
     var pattern   = declar.id;
-    if (traverse.isPattern(pattern) && patternId) {
+    if (t.isPattern(pattern) && patternId) {
       pushPattern(node.kind, nodes, pattern, patternId, file);
     } else {
       nodes.push(buildVariableAssign(node.kind, declar.id, declar.init));
diff --git a/lib/6to5/transformers/for-of.js b/lib/6to5/transformers/for-of.js
index 14ee860db2..f535347eff 100644
--- a/lib/6to5/transformers/for-of.js
+++ b/lib/6to5/transformers/for-of.js
@@ -1,4 +1,5 @@
 var util = require("../util");
+var t    = require("../types");
 var b    = require("../builders");
 
 exports.ForOfStatement = function (node, parent, file) {
@@ -24,7 +25,7 @@ exports.ForOfStatement = function (node, parent, file) {
     OBJECT:       node.right
   });
 
-  util.ensureBlock(node);
+  t.ensureBlock(node);
 
   var block = node2.body;
   block.body.push(declar);
diff --git a/lib/6to5/transformers/let-scoping.js b/lib/6to5/transformers/let-scoping.js
index 6bf477509a..439bde7bcd 100644
--- a/lib/6to5/transformers/let-scoping.js
+++ b/lib/6to5/transformers/let-scoping.js
@@ -1,5 +1,6 @@
 var traverse = require("../traverse");
 var util     = require("../util");
+var t        = require("../types");
 var b        = require("../builders");
 var _        = require("lodash");
 
@@ -23,13 +24,13 @@ exports.VariableDeclaration = function (node, parent, file) {
     var id = ids[node.name];
     if (!id) return;
 
-    if (util.isReferenced(node, parent)) return id;
+    if (t.isReferenced(node, parent)) return id;
   };
 
   var isProgram = parent.type === "Program";
 
   var replace = function (node, parent) {
-    if (!isProgram && _.contains(traverse.FUNCTION_TYPES, node.type)) {
+    if (!isProgram && _.contains(t.FUNCTION_TYPES, node.type)) {
       var letReferences = [];
 
       traverse(node, function (node, parent) {
diff --git a/lib/6to5/transformers/rest-parameters.js b/lib/6to5/transformers/rest-parameters.js
index 04b68fb6d6..1090f4fde3 100644
--- a/lib/6to5/transformers/rest-parameters.js
+++ b/lib/6to5/transformers/rest-parameters.js
@@ -1,4 +1,5 @@
 var util = require("../util");
+var t    = require("../types");
 var b    = require("../builders");
 
 exports.Function = function (node, parent, file) {
@@ -10,7 +11,7 @@ exports.Function = function (node, parent, file) {
   var templateName = "arguments-slice-assign";
   if (node.params.length) templateName += "-arg";
 
-  util.ensureBlock(node);
+  t.ensureBlock(node);
   node.body.body.unshift(util.template(templateName, {
     SLICE_KEY: file.addDeclaration("slice"),
     VARIABLE_NAME: rest,
diff --git a/lib/6to5/transformers/unicode-regex.js b/lib/6to5/transformers/unicode-regex.js
index b1d5e4e0a1..14c9c2143c 100644
--- a/lib/6to5/transformers/unicode-regex.js
+++ b/lib/6to5/transformers/unicode-regex.js
@@ -1,5 +1,4 @@
 var rewritePattern = require("regexpu/rewrite-pattern");
-var b              = require("../builders");
 var _              = require("lodash");
 
 exports.Literal = function (node) {
diff --git a/lib/6to5/traverse/index.js b/lib/6to5/traverse/index.js
index 6c95565b04..8e558cbdd5 100644
--- a/lib/6to5/traverse/index.js
+++ b/lib/6to5/traverse/index.js
@@ -72,20 +72,17 @@ var traverse = module.exports = function (parent, callbacks, blacklistTypes) {
   });
 };
 
-traverse.FUNCTION_TYPES = ["ArrowFunctionExpression", "FunctionDeclaration", "FunctionExpression"];
+traverse.removeProperties = function (tree) {
+  var clear = function (node) {
+    delete node.tokens;
+    delete node.range;
+    delete node.loc;
+  };
 
-traverse.aliases = {
-  ArrowFunctionExpression: ["Function"],
-  FunctionDeclaration:     ["Function"],
-  FunctionExpression:      ["Function"]
-};
+  clear(tree);
+  traverse(tree, clear);
 
-traverse.isFunction = function (node) {
-  return _.contains(traverse.FUNCTION_TYPES, node.type);
-};
-
-traverse.isPattern = function (node) {
-  return node.type === "ArrayPattern" || node.type === "ObjectPattern";
+  return tree;
 };
 
 traverse.hasType = function (tree, type, blacklistTypes) {
diff --git a/lib/6to5/types.js b/lib/6to5/types.js
new file mode 100644
index 0000000000..ae8bc0013b
--- /dev/null
+++ b/lib/6to5/types.js
@@ -0,0 +1,61 @@
+var b = require("./builders");
+var n = require("acorn-ast-types").namedTypes;
+var _ = require("lodash");
+
+exports.FUNCTION_TYPES = ["ArrowFunctionExpression", "FunctionDeclaration", "FunctionExpression"];
+
+exports.aliases = {
+  ArrowFunctionExpression: ["Function"],
+  FunctionDeclaration:     ["Function"],
+  FunctionExpression:      ["Function"]
+};
+
+exports.isFunction = function (node) {
+  return _.contains(exports.FUNCTION_TYPES, node.type);
+};
+
+exports.isPattern = function (node) {
+  return node.type === "ArrayPattern" || node.type === "ObjectPattern";
+};
+
+exports.isReferenced = function (node, parent) {
+  // we're a property key so we aren't referenced
+  if (parent.type === "Property" && parent.key === node) return false;
+
+  var isMemberExpression = parent.type === "MemberExpression";
+
+  // we're in a member expression and we're the computed property so we're referenced
+  var isComputedProperty = isMemberExpression && parent.property === node && parent.computed;
+
+  // we're in a member expression and we're the object so we're referenced
+  var isObject = isMemberExpression && parent.object === node;
+
+  // we are referenced
+  if (!isMemberExpression || isComputedProperty || isObject) return true;
+
+  return false;
+};
+
+exports.ensureBlock = function (node) {
+  var block = node.body;
+  if (block.type === "BlockStatement") return;
+
+  if (!_.isArray(block)) {
+    if (!n.Statement.check(block)) block = b.returnStatement(block);
+    block = [block];
+  }
+
+  node.body = b.blockStatement(block);
+};
+
+exports.getSpecifierName = function (specifier) {
+  return specifier.name || specifier.id;
+};
+
+exports.ensureExpressionType = function (node) {
+  node.type = {
+    FunctionDeclaration: "FunctionExpression",
+    ClassDeclaration: "ClassExpression"
+  }[node.type] || node.type;
+  return node;
+};
diff --git a/lib/6to5/util.js b/lib/6to5/util.js
index a0726f0188..313f58d5b2 100644
--- a/lib/6to5/util.js
+++ b/lib/6to5/util.js
@@ -1,28 +1,13 @@
 var traverse = require("./traverse");
-var astTypes = require("acorn-ast-types");
 var acorn    = require("acorn-jsx");
 var path     = require("path");
 var util     = require("util");
 var fs       = require("fs");
+var b        = require("./builders");
 var _        = require("lodash");
 
-var n = astTypes.namedTypes;
-var b = astTypes.builders;
-
 exports.inherits = util.inherits;
 
-exports.ensureBlock = function (node) {
-  var block = node.body;
-  if (block.type === "BlockStatement") return;
-
-  if (!_.isArray(block)) {
-    if (!n.Statement.check(block)) block = b.returnStatement(block);
-    block = [block];
-  }
-
-  node.body = b.blockStatement(block);
-};
-
 exports.resolve = function (loc) {
   try {
     return require.resolve(loc);
@@ -35,18 +20,6 @@ exports.list = function (val) {
   return val ? val.split(",") : [];
 };
 
-exports.getSpecifierName = function (specifier) {
-  return specifier.name || specifier.id;
-};
-
-exports.ensureExpressionType = function (node) {
-  node.type = {
-    FunctionDeclaration: "FunctionExpression",
-    ClassDeclaration: "ClassExpression"
-  }[node.type] || node.type;
-  return node;
-};
-
 exports.getUid = function (parent, file) {
   var node;
 
@@ -72,19 +45,6 @@ exports.isAbsolute = function (loc) {
   return false;
 };
 
-exports.removeProperties = function (tree) {
-  var clear = function (node) {
-    delete node.tokens;
-    delete node.range;
-    delete node.loc;
-  };
-
-  clear(tree);
-  traverse(tree, clear);
-
-  return tree;
-};
-
 exports.getIds = function (node) {
   var search = [node];
   var ids  = [];
@@ -198,24 +158,6 @@ exports.template = function (name, nodes, keepExpression) {
   }
 };
 
-exports.isReferenced = function (node, parent) {
-  // we're a property key
-  if (parent.type === "Property" && parent.key === node) return false;
-
-  var isMemberExpression = parent.type === "MemberExpression";
-
-  // we're in a member expression and we're the computed property so we're referenced
-  var isComputedProperty = isMemberExpression && parent.property === node && parent.computed;
-
-  // we're in a member expression and we're the object so we're referenced
-  var isObject = isMemberExpression && parent.object === node;
-
-  // we are referenced
-  if (!isMemberExpression || isComputedProperty || isObject) return true;
-
-  return false;
-};
-
 exports.codeFrame = function (lines, lineNumber, colNumber) {
   colNumber = Math.max(colNumber, 0);
 
@@ -280,8 +222,8 @@ exports.parse = function (opts, code, callback) {
       program: ast
     };
 
-    ast.tokens = tokens;
     ast.comments = comments;
+    ast.tokens   = tokens;
 
     if (callback) {
       return callback(ast);
@@ -308,7 +250,7 @@ exports.parse = function (opts, code, callback) {
 
 exports.parseNoProperties = function (loc, code) {
   var ast = exports.parse({ filename: loc }, code).program;
-  return exports.removeProperties(ast);
+  return traverse.removeProperties(ast);
 };
 
 try {