diff --git a/lib/6to5/transformation/transformers/classes.js b/lib/6to5/transformation/transformers/classes.js
index 6b7f51a58f..a563572621 100644
--- a/lib/6to5/transformation/transformers/classes.js
+++ b/lib/6to5/transformation/transformers/classes.js
@@ -153,7 +153,7 @@ var superIdentifier = function (superName, methodNode, node, parent) {
 
   if (parent.property === node) {
     return;
-  } else if (t.isCallExpression(parent) && parent.callee === node) {
+  } else if (t.isCallExpression(parent, { callee: node })) {
     // super(); -> ClassName.prototype.MethodName.call(this);
     parent.arguments.unshift(t.thisExpression());
 
@@ -186,7 +186,7 @@ var replaceInstanceSuperReferences = function (superName, methodNode) {
   superName = superName || t.identifier("Function");
 
   traverse(method, function (node, parent) {
-    if (t.isIdentifier(node) && node.name === "super") {
+    if (t.isIdentifier(node, { name: "super" })) {
       return superIdentifier(superName, methodNode, node, parent);
     } else if (t.isCallExpression(node)) {
       var callee = node.callee;
diff --git a/lib/6to5/transformation/transformers/constants.js b/lib/6to5/transformation/transformers/constants.js
index ec7ad31f42..b173f06b0b 100644
--- a/lib/6to5/transformation/transformers/constants.js
+++ b/lib/6to5/transformation/transformers/constants.js
@@ -18,7 +18,7 @@ exports.ForStatement = function (node, parent, file) {
   };
 
   _.each(node.body, function (child) {
-    if (child && t.isVariableDeclaration(child) && child.kind === "const") {
+    if (child && t.isVariableDeclaration(child, { kind: "const" })) {
       _.each(child.declarations, function (declar) {
         _.each(t.getIds(declar), function (name) {
           check(declar, [name]);
diff --git a/lib/6to5/transformation/transformers/destructuring.js b/lib/6to5/transformation/transformers/destructuring.js
index 86825ade8d..67690661e5 100644
--- a/lib/6to5/transformation/transformers/destructuring.js
+++ b/lib/6to5/transformation/transformers/destructuring.js
@@ -61,7 +61,7 @@ var pushPattern = function (opts) {
   var file = opts.file;
   var scope = opts.scope;
 
-  if (parentId.type !== "MemberExpression" && parentId.type !== "Identifier") {
+  if (!t.isMemberExpression(parentId) && !t.isIdentifier(parentId)) {
     var key = t.identifier(file.generateUid("ref", scope));
 
     nodes.push(t.variableDeclaration("var", [
@@ -77,7 +77,7 @@ var pushPattern = function (opts) {
 exports.ForInStatement =
 exports.ForOfStatement = function (node, parent, file, scope) {
   var declar = node.left;
-  if (declar.type !== "VariableDeclaration") return;
+  if (!t.isVariableDeclaration(declar)) return;
 
   var pattern = declar.declarations[0].id;
   if (!t.isPattern(pattern)) return;
@@ -147,7 +147,7 @@ exports.ExpressionStatement = function (node, parent, file, scope) {
 };
 
 exports.VariableDeclaration = function (node, parent, file, scope) {
-  if (t.isForInStatement(parent)) return;
+  if (t.isForInStatement(parent) || t.isForOfStatement(parent)) return;
 
   var nodes = [];
 
@@ -177,13 +177,13 @@ exports.VariableDeclaration = function (node, parent, file, scope) {
     }
   });
 
-  if (parent.type !== "Program" && parent.type !== "BlockStatement") {
+  if (!t.isProgram(parent) && !t.isBlockStatement(parent)) {
     var declar;
 
     _.each(nodes, function (node) {
       declar = declar || t.variableDeclaration(node.kind, []);
 
-      if (node.type !== "VariableDeclaration" && declar.kind !== node.kind) {
+      if (!t.isVariableDeclaration(node) && declar.kind !== node.kind) {
         throw file.errorWithNode(node, "Cannot use this node within the current parent");
       }
 
diff --git a/lib/6to5/transformation/transformers/let-scoping.js b/lib/6to5/transformation/transformers/let-scoping.js
index 413125d41f..ffe1d7dc17 100644
--- a/lib/6to5/transformation/transformers/let-scoping.js
+++ b/lib/6to5/transformation/transformers/let-scoping.js
@@ -13,7 +13,7 @@ var isLet = function (node) {
 };
 
 var isVar = function (node) {
-  return t.isVariableDeclaration(node) && node.kind === "var" && !isLet(node);
+  return t.isVariableDeclaration(node, { kind: "var" }) && !isLet(node);
 };
 
 exports.VariableDeclaration = function (node) {
diff --git a/lib/6to5/transformation/transformers/react.js b/lib/6to5/transformation/transformers/react.js
index b7df808d16..8b9af5894a 100644
--- a/lib/6to5/transformation/transformers/react.js
+++ b/lib/6to5/transformation/transformers/react.js
@@ -2,18 +2,18 @@ var t = require("../../types");
 var _ = require("lodash");
 
 var addDisplayName = function (id, call) {
-  if (!call || call.type !== "CallExpression") return;
+  if (!call || !t.isCallExpression(call)) return;
 
   var callee = call.callee;
-  if (callee.type !== "MemberExpression") return;
+  if (!t.isMemberExpression(callee)) return;
 
   // not React
   var obj = callee.object;
-  if (obj.type !== "Identifier" || obj.name !== "React") return;
+  if (!t.isIdentifier(obj, { name: "React" })) return;
 
   // not createClass
   var prop = callee.property;
-  if (prop.type !== "Identifier" || prop.name !== "createClass") return;
+  if (!t.isIdentifier(prop, { name: "createClass" })) return;
 
   // no arguments
   var args = call.arguments;
@@ -21,13 +21,14 @@ var addDisplayName = function (id, call) {
 
   // not an object
   var first = args[0];
-  if (first.type !== "ObjectExpression") return;
+  if (!t.isObjectExpression(first)) return;
 
   var props = first.properties;
   var safe = true;
 
   _.each(props, function (prop) {
-    if (prop.key.name === "displayName") {
+    var key = prop.key;
+    if (t.isIdentifier(prop.key, { name: "displayName" })) {
       return safe = false;
     }
   });
diff --git a/lib/6to5/transformation/transformers/spread.js b/lib/6to5/transformation/transformers/spread.js
index 23094d296e..a3f11826b5 100644
--- a/lib/6to5/transformation/transformers/spread.js
+++ b/lib/6to5/transformation/transformers/spread.js
@@ -4,7 +4,7 @@ var _    = require("lodash");
 
 var getSpreadLiteral = function (spread, file) {
   var literal = spread.argument;
-  if (literal.type !== "ArrayExpression") {
+  if (!t.isArrayExpression(literal)) {
     literal = util.template("call", {
       OBJECT: file.addDeclaration("slice"),
       CONTEXT: literal
diff --git a/lib/6to5/transformation/transformers/template-literals.js b/lib/6to5/transformation/transformers/template-literals.js
index e89add41d6..c9b923f277 100644
--- a/lib/6to5/transformation/transformers/template-literals.js
+++ b/lib/6to5/transformation/transformers/template-literals.js
@@ -34,7 +34,7 @@ exports.TemplateLiteral = function (node) {
   if (nodes.length > 1) {
     // remove redundant '' at the end of the expression
     var last = _.last(nodes);
-    if (t.isLiteral(last) && last.value === "") nodes.pop();
+    if (t.isLiteral(last, { value: "" })) nodes.pop();
 
     var root = buildBinaryExpression(nodes.shift(), nodes.shift());
 
diff --git a/lib/6to5/transformation/transformers/use-strict.js b/lib/6to5/transformation/transformers/use-strict.js
index 729421fbaa..c4b352cc20 100644
--- a/lib/6to5/transformation/transformers/use-strict.js
+++ b/lib/6to5/transformation/transformers/use-strict.js
@@ -4,7 +4,7 @@ module.exports = function (ast) {
   var body = ast.program.body;
   var first = body[0];
 
-  var noStrict = !first || first.type !== "ExpressionStatement" || first.expression.type !== "Literal" || first.expression.value !== "use strict";
+  var noStrict = !first || !t.isExpressionStatement(first) || !t.isLiteral(first.expression) || first.expression.value !== "use strict";
 
   if (noStrict) {
     body.unshift(t.expressionStatement(t.literal("use strict")));
diff --git a/lib/6to5/types/index.js b/lib/6to5/types/index.js
index 571021739f..af6f2fe0d2 100644
--- a/lib/6to5/types/index.js
+++ b/lib/6to5/types/index.js
@@ -9,8 +9,8 @@ var t = exports;
 t.VISITOR_KEYS = require("./visitor-keys");
 
 _.each(t.VISITOR_KEYS, function (keys, type) {
-  t["is" + type] = function (node) {
-    return node && node.type === type;
+  t["is" + type] = function (node, opts) {
+    return node && node.type === type && t.shallowEqual(node, opts);
   };
 });
 
@@ -45,13 +45,29 @@ _.each(t.ALIAS_KEYS, function (aliases, type) {
 _.each(_aliases, function (types, type) {
   t[type.toUpperCase() + "_TYPES"] = types;
 
-  t["is" + type] = function (node) {
-    return node && _.contains(types, node.type);
+  t["is" + type] = function (node, opts) {
+    return node && _.contains(types, node.type) && t.shallowEqual(node, opts);
   };
 });
 
 //
 
+t.shallowEqual = function (actual, expected) {
+  var same = true;
+
+  if (expected) {
+    _.each(expected, function (val, key) {
+      if (actual[key] !== val) {
+        return same = false;
+      }
+    });
+  }
+
+  return same;
+};
+
+//
+
 t.isReferenced = function (node, parent) {
   // we're a property key so we aren't referenced
   if (t.isProperty(parent) && parent.key === node) return false;
@@ -172,24 +188,3 @@ t.inherits = function (child, parent) {
 t.getSpecifierName = function (specifier) {
   return specifier.name || specifier.id;
 };
-
-//
-
-t.PRECEDENCE = {};
-
-_.each([
-  ["||"],
-  ["&&"],
-  ["|"],
-  ["^"],
-  ["&"],
-  ["==", "===", "!=", "!=="],
-  ["<", ">", "<=", ">=", "in", "instanceof"],
-  [">>", "<<", ">>>"],
-  ["+", "-"],
-  ["*", "/", "%"]
-], function (tier, i) {
-  _.each(tier, function (op) {
-    t.PRECEDENCE[op] = i;
-  });
-});