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/**
@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
*/
'use strict';
import {applyStylePlaceHolder} from './style-util.js';
import {nativeShadow} from './style-settings.js';
/** @type {!Object<string, !Node>} */
const placeholderMap = {};
/**
* @param {string} elementName
* @return {Node}
*/
export function getStylePlaceholder(elementName) {
return placeholderMap[elementName] || null;
}
/**
* @param {string} elementName
*/
export function ensureStylePlaceholder(elementName) {
if (!placeholderMap[elementName]) {
placeholderMap[elementName] = applyStylePlaceHolder(elementName);
}
}
/**
* @const {CustomElementRegistry}
*/
const ce = window['customElements'];
if (ce && !nativeShadow) {
/**
* @const {function(this:CustomElementRegistry, string,function(new:HTMLElement),{extends: string}=)}
*/
const origDefine = ce['define'];
/**
* @param {string} name
* @param {function(new:HTMLElement)} clazz
* @param {{extends: string}=} options
*/
const wrappedDefine = (name, clazz, options) => {
ensureStylePlaceholder(name);
origDefine.call(/** @type {!CustomElementRegistry} */(ce), name, clazz, options);
};
ce['define'] = wrappedDefine;
}
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