vue-material/src/core/utils/MdObserveElement.js

Material Design for Vue.js

export default (el, config, cb) => {
  if ('MutationObserver' in window) {
    const observer = new window.MutationObserver(cb)

    observer.observe(el, config)

    return {
      disconnect: () => {
        observer.disconnect()
      }
    }
  }
}