diff --git a/src/babel/transformation/file/index.js b/src/babel/transformation/file/index.js
index cd4417b4df..accbe5f09a 100644
--- a/src/babel/transformation/file/index.js
+++ b/src/babel/transformation/file/index.js
@@ -58,7 +58,6 @@ export default class File {
     "defaults",
     "create-class",
     "create-decorated-class",
-    "apply-constructor",
     "tagged-template-literal",
     "tagged-template-literal-loose",
     "interop-require",
@@ -324,7 +323,7 @@ export default class File {
       var id = t.identifier(t.toIdentifier(name));
       return t.memberExpression(runtime, id);
     } else {
-      var ref = util.template(name);
+      var ref = util.template("helper-" + name);
       ref._compact = true;
       var uid = this.scope.generateUidIdentifier(name);
       this.scope.push({
diff --git a/src/babel/transformation/templates/apply-constructor.js b/src/babel/transformation/templates/apply-constructor.js
deleted file mode 100644
index db337be303..0000000000
--- a/src/babel/transformation/templates/apply-constructor.js
+++ /dev/null
@@ -1,5 +0,0 @@
-(function (Constructor, args) {
-  var instance = Object.create(Constructor.prototype);
-  var result = Constructor.apply(instance, args);
-  return result != null && (typeof result == "object" || typeof result == "function") ? result : instance;
-});
diff --git a/src/babel/transformation/templates/create-decorated-class.js b/src/babel/transformation/templates/create-decorated-class.js
deleted file mode 100644
index 2a16ebf5b9..0000000000
--- a/src/babel/transformation/templates/create-decorated-class.js
+++ /dev/null
@@ -1,30 +0,0 @@
-(function() {
-  function defineProperties(target, props) {
-    for (var i = 0; i < props.length; i ++) {
-      var descriptor = props[i];
-
-      descriptor.enumerable = false;
-      descriptor.configurable = true;
-      if (descriptor.value) descriptor.writable = true;
-
-      if (descriptor.decorators) {
-        for (var i = 0; i < descriptor.decorators.length; i++) {
-          var decorator = descriptor.decorators[i];
-          if (typeof decorator === "function") {
-            descriptor = decorator(target, descriptor.key, descriptor) || descriptor;
-          } else {
-            throw new TypeError("The decorator for method " + descriptor.key + " is of the invalid type " + typeof decorator);
-          }
-        }
-      }
-
-      Object.defineProperty(target, descriptor.key, descriptor);
-    }
-  }
-
-  return function (Constructor, protoProps, staticProps) {
-    if (protoProps) defineProperties(Constructor.prototype, protoProps);
-    if (staticProps) defineProperties(Constructor, staticProps);
-    return Constructor;
-  };
-})()
diff --git a/src/babel/transformation/templates/async-to-generator.js b/src/babel/transformation/templates/helper-async-to-generator.js
similarity index 100%
rename from src/babel/transformation/templates/async-to-generator.js
rename to src/babel/transformation/templates/helper-async-to-generator.js
diff --git a/src/babel/transformation/templates/bind.js b/src/babel/transformation/templates/helper-bind.js
similarity index 100%
rename from src/babel/transformation/templates/bind.js
rename to src/babel/transformation/templates/helper-bind.js
diff --git a/src/babel/transformation/templates/class-call-check.js b/src/babel/transformation/templates/helper-class-call-check.js
similarity index 100%
rename from src/babel/transformation/templates/class-call-check.js
rename to src/babel/transformation/templates/helper-class-call-check.js
diff --git a/src/babel/transformation/templates/create-class.js b/src/babel/transformation/templates/helper-create-class.js
similarity index 57%
rename from src/babel/transformation/templates/create-class.js
rename to src/babel/transformation/templates/helper-create-class.js
index 4ebbc7e61e..09df13e546 100644
--- a/src/babel/transformation/templates/create-class.js
+++ b/src/babel/transformation/templates/helper-create-class.js
@@ -1,10 +1,11 @@
 (function() {
   function defineProperties(target, props) {
     for (var i = 0; i < props.length; i ++) {
-      var prop = props[i];
-      prop.configurable = true;
-      if (prop.value) prop.writable = true;
-      Object.defineProperty(target, prop.key, prop);
+      var descriptor = props[i];
+      descriptor.enumerable = descriptor.enumerable || false;
+      descriptor.configurable = true;
+      if (descriptor.value) descriptor.writable = true;
+      Object.defineProperty(target, descriptor.key, descriptor);
     }
   }
 
diff --git a/src/babel/transformation/templates/helper-create-decorated-class.js b/src/babel/transformation/templates/helper-create-decorated-class.js
new file mode 100644
index 0000000000..af5b6ae992
--- /dev/null
+++ b/src/babel/transformation/templates/helper-create-decorated-class.js
@@ -0,0 +1,37 @@
+(function() {
+  function defineProperties(target, descriptors) {
+    for (var i = 0; i < descriptors.length; i ++) {
+      var descriptor = descriptors[i];
+      var decorators = descriptor.decorators;
+      var key        = descriptor.key;
+
+      // don't want to expose these to userland since i know people will rely on them
+      // and think it's spec behaviour
+      delete descriptor.key;
+      delete descriptor.decorators;
+
+      descriptor.enumerable = descriptor.enumerable || false;
+      descriptor.configurable = true;
+      if ("value" in descriptor || descriptor.initializer) descriptor.writable = true;
+
+      if (decorators) {
+        for (var f = 0; f < decorators.length; f++) {
+          var decorator = decorators[f];
+          if (typeof decorator === "function") {
+            descriptor = decorator(target, key, descriptor) || descriptor;
+          } else {
+            throw new TypeError("The decorator for method " + descriptor.key + " is of the invalid type " + typeof decorator);
+          }
+        }
+      }
+
+      Object.defineProperty(target, key, descriptor);
+    }
+  }
+
+  return function (Constructor, protoProps, staticProps) {
+    if (protoProps) defineProperties(Constructor.prototype, protoProps);
+    if (staticProps) defineProperties(Constructor, staticProps);
+    return Constructor;
+  };
+})()
diff --git a/src/babel/transformation/templates/defaults.js b/src/babel/transformation/templates/helper-defaults.js
similarity index 100%
rename from src/babel/transformation/templates/defaults.js
rename to src/babel/transformation/templates/helper-defaults.js
diff --git a/src/babel/transformation/templates/define-property.js b/src/babel/transformation/templates/helper-define-property.js
similarity index 100%
rename from src/babel/transformation/templates/define-property.js
rename to src/babel/transformation/templates/helper-define-property.js
diff --git a/src/babel/transformation/templates/extends.js b/src/babel/transformation/templates/helper-extends.js
similarity index 100%
rename from src/babel/transformation/templates/extends.js
rename to src/babel/transformation/templates/helper-extends.js
diff --git a/src/babel/transformation/templates/get.js b/src/babel/transformation/templates/helper-get.js
similarity index 100%
rename from src/babel/transformation/templates/get.js
rename to src/babel/transformation/templates/helper-get.js
diff --git a/src/babel/transformation/templates/has-own.js b/src/babel/transformation/templates/helper-has-own.js
similarity index 100%
rename from src/babel/transformation/templates/has-own.js
rename to src/babel/transformation/templates/helper-has-own.js
diff --git a/src/babel/transformation/templates/inherits.js b/src/babel/transformation/templates/helper-inherits.js
similarity index 100%
rename from src/babel/transformation/templates/inherits.js
rename to src/babel/transformation/templates/helper-inherits.js
diff --git a/src/babel/transformation/templates/interop-require-wildcard.js b/src/babel/transformation/templates/helper-interop-require-wildcard.js
similarity index 100%
rename from src/babel/transformation/templates/interop-require-wildcard.js
rename to src/babel/transformation/templates/helper-interop-require-wildcard.js
diff --git a/src/babel/transformation/templates/interop-require.js b/src/babel/transformation/templates/helper-interop-require.js
similarity index 100%
rename from src/babel/transformation/templates/interop-require.js
rename to src/babel/transformation/templates/helper-interop-require.js
diff --git a/src/babel/transformation/templates/object-destructuring-empty.js b/src/babel/transformation/templates/helper-object-destructuring-empty.js
similarity index 100%
rename from src/babel/transformation/templates/object-destructuring-empty.js
rename to src/babel/transformation/templates/helper-object-destructuring-empty.js
diff --git a/src/babel/transformation/templates/object-without-properties.js b/src/babel/transformation/templates/helper-object-without-properties.js
similarity index 100%
rename from src/babel/transformation/templates/object-without-properties.js
rename to src/babel/transformation/templates/helper-object-without-properties.js
diff --git a/src/babel/transformation/templates/self-global.js b/src/babel/transformation/templates/helper-self-global.js
similarity index 100%
rename from src/babel/transformation/templates/self-global.js
rename to src/babel/transformation/templates/helper-self-global.js
diff --git a/src/babel/transformation/templates/set.js b/src/babel/transformation/templates/helper-set.js
similarity index 100%
rename from src/babel/transformation/templates/set.js
rename to src/babel/transformation/templates/helper-set.js
diff --git a/src/babel/transformation/templates/sliced-to-array-loose.js b/src/babel/transformation/templates/helper-sliced-to-array-loose.js
similarity index 100%
rename from src/babel/transformation/templates/sliced-to-array-loose.js
rename to src/babel/transformation/templates/helper-sliced-to-array-loose.js
diff --git a/src/babel/transformation/templates/sliced-to-array.js b/src/babel/transformation/templates/helper-sliced-to-array.js
similarity index 100%
rename from src/babel/transformation/templates/sliced-to-array.js
rename to src/babel/transformation/templates/helper-sliced-to-array.js
diff --git a/src/babel/transformation/templates/tagged-template-literal-loose.js b/src/babel/transformation/templates/helper-tagged-template-literal-loose.js
similarity index 100%
rename from src/babel/transformation/templates/tagged-template-literal-loose.js
rename to src/babel/transformation/templates/helper-tagged-template-literal-loose.js
diff --git a/src/babel/transformation/templates/tagged-template-literal.js b/src/babel/transformation/templates/helper-tagged-template-literal.js
similarity index 100%
rename from src/babel/transformation/templates/tagged-template-literal.js
rename to src/babel/transformation/templates/helper-tagged-template-literal.js
diff --git a/src/babel/transformation/templates/temporal-assert-defined.js b/src/babel/transformation/templates/helper-temporal-assert-defined.js
similarity index 100%
rename from src/babel/transformation/templates/temporal-assert-defined.js
rename to src/babel/transformation/templates/helper-temporal-assert-defined.js
diff --git a/src/babel/transformation/templates/temporal-undefined.js b/src/babel/transformation/templates/helper-temporal-undefined.js
similarity index 100%
rename from src/babel/transformation/templates/temporal-undefined.js
rename to src/babel/transformation/templates/helper-temporal-undefined.js
diff --git a/src/babel/transformation/templates/to-array.js b/src/babel/transformation/templates/helper-to-array.js
similarity index 100%
rename from src/babel/transformation/templates/to-array.js
rename to src/babel/transformation/templates/helper-to-array.js
diff --git a/src/babel/transformation/templates/to-consumable-array.js b/src/babel/transformation/templates/helper-to-consumable-array.js
similarity index 100%
rename from src/babel/transformation/templates/to-consumable-array.js
rename to src/babel/transformation/templates/helper-to-consumable-array.js
diff --git a/src/babel/transformation/templates/typeof.js b/src/babel/transformation/templates/helper-typeof.js
similarity index 100%
rename from src/babel/transformation/templates/typeof.js
rename to src/babel/transformation/templates/helper-typeof.js