import SassTracker from '@no-repeat/sass-tracker';

/**
 * @param {Object} window对象
 * @param {String} 要追踪的class前缀
 */
const sassTracker = new SassTracker(window, '.button-')

// sass-mapper获得的映射表
const varsMap = {};

// 要追踪的元素
const elem = document.getElementById('demo-item');

const cssRules = sassTracker.findCssRules(elem, true);
const vars = sassTracker.findVars(cssRules, varsMap);