@polymer/polymer/lib/utils/wrap.js

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

/**
@license
Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/

/* eslint-disable valid-jsdoc */
/**
 * Node wrapper to ensure ShadowDOM safe operation regardless of polyfill
 * presence or mode. Note that with the introduction of `ShadyDOM.noPatch`,
 * a node wrapper must be used to access ShadowDOM API.
 * This is similar to using `Polymer.dom` but relies exclusively
 * on the presence of the ShadyDOM polyfill rather than requiring the loading
 * of legacy (Polymer.dom) API.
 * @type {function(Node):Node}
 */
export const wrap = (window['ShadyDOM'] && window['ShadyDOM']['noPatch'] && window['ShadyDOM']['wrap']) ?
  window['ShadyDOM']['wrap'] :
  (window['ShadyDOM'] ? (n) => ShadyDOM['patch'](n) : (n) => n);