import { computed } from '@ember/object'; import { readOnly } from '@ember/object/computed'; import { copy } from 'ember-copy'; import Service from '@ember/service'; let list = {}; export default class WatchListService extends Service { @computed get _list() { return copy(list, true); } @readOnly('_list') list; constructor() { super(...arguments); list = {}; } getIndexFor(url) { return list[url] || 1; } setIndexFor(url, value) { list[url] = +value; } }