/** * @license * Copyright (c) 2020 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 */ declare type CustomPropertyValues = { [property: string]: string; }; /** * Prepare the given custom element template for use with the ShadyCSS style * scoping polyfill. You only need to do this once per template. * * If ShadyCSS is not active, then this function does nothing. * * If ShadyCSS is active, then after styleElement is called on the first * instance of this element,