diff --git a/types/externs/closure-types.d.ts b/types/externs/closure-types.d.ts
deleted file mode 100644
index a9dac916c2..0000000000
--- a/types/externs/closure-types.d.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-/**
- * DO NOT EDIT
- *
- * This file was automatically generated by
- *   https://github.com/Polymer/gen-typescript-declarations
- *
- * To modify these typings, edit the source file(s):
- *   externs/closure-types.js
- */
-
diff --git a/types/externs/polymer-externs.d.ts b/types/externs/polymer-externs.d.ts
deleted file mode 100644
index 6cf2cc7426..0000000000
--- a/types/externs/polymer-externs.d.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-/**
- * DO NOT EDIT
- *
- * This file was automatically generated by
- *   https://github.com/Polymer/gen-typescript-declarations
- *
- * To modify these typings, edit the source file(s):
- *   externs/polymer-externs.js
- */
-
diff --git a/types/externs/polymer-internal-shared-types.d.ts b/types/externs/polymer-internal-shared-types.d.ts
deleted file mode 100644
index f6fef0f1fe..0000000000
--- a/types/externs/polymer-internal-shared-types.d.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-/**
- * DO NOT EDIT
- *
- * This file was automatically generated by
- *   https://github.com/Polymer/gen-typescript-declarations
- *
- * To modify these typings, edit the source file(s):
- *   externs/polymer-internal-shared-types.js
- */
-
diff --git a/types/externs/webcomponents-externs.d.ts b/types/externs/webcomponents-externs.d.ts
deleted file mode 100644
index 87cdda9b58..0000000000
--- a/types/externs/webcomponents-externs.d.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-/**
- * DO NOT EDIT
- *
- * This file was automatically generated by
- *   https://github.com/Polymer/gen-typescript-declarations
- *
- * To modify these typings, edit the source file(s):
- *   externs/webcomponents-externs.js
- */
-
diff --git a/types/gulpfile.d.ts b/types/gulpfile.d.ts
deleted file mode 100644
index 2d52f67506..0000000000
--- a/types/gulpfile.d.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-/**
- * DO NOT EDIT
- *
- * This file was automatically generated by
- *   https://github.com/Polymer/gen-typescript-declarations
- *
- * To modify these typings, edit the source file(s):
- *   gulpfile.js
- */
-
-declare class BackfillStream {
-  _transform(file: any, enc: any, cb: any): any;
-  _flush(cb: any): any;
-}
-
-declare class AddClosureTypeImport {
-  _transform(file: any, enc: any, cb: any): any;
-}
diff --git a/types/lib/legacy/mutable-data-behavior.d.ts b/types/lib/legacy/mutable-data-behavior.d.ts
index 67c7f5d50e..ea580cc881 100644
--- a/types/lib/legacy/mutable-data-behavior.d.ts
+++ b/types/lib/legacy/mutable-data-behavior.d.ts
@@ -66,6 +66,8 @@ declare namespace Polymer {
     _shouldPropertyChange(property: string, value: any, old: any): boolean;
   }
 
+  const MutableDataBehavior: object;
+
   /**
    * Legacy element behavior to add the optional ability to skip strict
    * dirty-checking for objects and arrays (always consider them to be
@@ -128,4 +130,6 @@ declare namespace Polymer {
      */
     _shouldPropertyChange(property: string, value: any, old: any): boolean;
   }
+
+  const OptionalMutableDataBehavior: object;
 }
diff --git a/types/lib/legacy/templatizer-behavior.d.ts b/types/lib/legacy/templatizer-behavior.d.ts
index cf91f2eb40..81f1df4a2e 100644
--- a/types/lib/legacy/templatizer-behavior.d.ts
+++ b/types/lib/legacy/templatizer-behavior.d.ts
@@ -111,4 +111,6 @@ declare namespace Polymer {
      */
     modelForElement(el: HTMLElement|null): TemplateInstanceBase|null;
   }
+
+  const Templatizer: object;
 }
diff --git a/types/util/minimalDocument.d.ts b/types/util/minimalDocument.d.ts
deleted file mode 100644
index 6b08817411..0000000000
--- a/types/util/minimalDocument.d.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * DO NOT EDIT
- *
- * This file was automatically generated by
- *   https://github.com/Polymer/gen-typescript-declarations
- *
- * To modify these typings, edit the source file(s):
- *   util/minimalDocument.js
- */
-
-declare class MinimalDocTransform {
-  _transform(file: any, enc: any, cb: any): any;
-}