text: /**
  @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 { MIXIN_MATCH, VAR_ASSIGN } from './common-regex.js'
  
  /**
   * @param {Element} element
   * @param {Object=} properties
   */
  export function updateNativeProperties(element, properties) {
    // remove previous properties
    for (let p in properties) {
      // NOTE: for bc with shim, don't apply null values.
      if (p === null) {
        element.style.removeProperty(p);
      } else {
        element.style.setProperty(p, properties[p]);
      }
    }
  }
  
  /**
   * @param {Element} element
   * @param {string} property
   * @return {string}
   */
  export function getComputedStyleValue(element, property) {
    /**
     * @const {string}
     */
    const value = window.getComputedStyle(element).getPropertyValue(property);
    if (!value) {
      return '';
    } else {
      return value.trim();
    }
  }
  
  /**
   * return true if `cssText` contains a mixin definition or consumption
   * @param {string} cssText
   * @return {boolean}
   */
  export function detectMixin(cssText) {
    const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);
    // reset state of the regexes
    MIXIN_MATCH.lastIndex = 0;
    VAR_ASSIGN.lastIndex = 0;
    return has;
  }
  