@anypoint-web-components/anypoint-selector/src/AnypointSelector.js

Port of iron-selector that works with ES6 classes. Manages a list of elements that can be selected.

import { LitElement } from 'lit-element';
import { MultiSelectableMixin } from './MultiSelectableMixin.js';

export class AnypointSelector extends MultiSelectableMixin(LitElement) {
  createRenderRoot() {
    return this;
  }
}