@polymer/polymer/lib/utils/wrap.d.ts

The Polymer library makes it easy to create your own web components. Give your element some markup and properties, and then use it on a site. Polymer provides features like dynamic templates and data binding to reduce the amount of boilerplate you need to

// tslint:disable:variable-name Describing an API that's defined elsewhere.

export const wrap: <T extends Node>(node: T) => T;