diff --git a/types/polymer/index.d.ts b/types/polymer/index.d.ts
index 0691c8506f..3392f7c7e3 100644
--- a/types/polymer/index.d.ts
+++ b/types/polymer/index.d.ts
@@ -218,6 +218,10 @@ declare global {
       detached?(): void;
 
       attributeChanged?(name: string, oldValue: any, newValue: any): void;
+        
+      getEffectiveChildren?(): Node[];
+
+      getEffectiveChildNodes?(): Node[];
     }
 
     // This is the type of a Polymer element after it has gone through the
@@ -277,6 +281,10 @@ declare global {
       observeNodes(callback: (info: ObservedNodeInfo) => void): {};
 
       unobserveNodes(observer: {}): void;
+        
+      getEffectiveChildren(): Node[];
+
+      getEffectiveChildNodes(): Node[];
 
       childNodes:Node[];