https://www.polymer-project.org/1.0/docs/devguide/events.html
Polymer.dom(event).localTarget/path/rootTarget
This needs to be added to polymer-ts.d.ts
Starting line 57
interface dom {
(event: Event): Dom.api.Event;
(node: HTMLElement): HTMLElement;
(node: polymer.Base): HTMLElement;
flush(): any;
}
This solves the errors I am getting from atom-typescript and it runs fine.