How to use the store2.get function in store2

private saveCurrentWallpaper = () => {
    const suffix = this.getSuffix(storage.get("image.type"))
    const filename = `mdnt-bg.${suffix}`
    chrome.downloads.download({
      url: this.props.url,
      filename,
    })
  }
  public render() {

export function destroyLocalActions () {
  const stored = store.get(KEY);
  store.set(KEY, NULL);
  return stored === NULL ? false : stored;
}
export function saveLocalActions (actions) {

export const get = state => store.get(state.storeId);

function startSavedGame() {
  const game = store.get("game");

  if (game) {
    const tiles = _.flatten(game.grid, true);
    if (_.pluck(tiles, "id").length) id = _.max(ids) + 1;
    game.fromSaved = true;
    return fromJS(game);
  }
}

componentDidMount() {
    Layout.loadCarbonAds();

    this.setState({
      checked: store.get("mode") === "dark"
    });

    window.addEventListener("beforeunload", this.alertExistHandler);
  }

() => {
        if (!document.hidden) {
          this.setState({
            itemsInCart: store.get('itemsInCart') || []
          });
          this.authUser();
        }
      }
    );

mounted() {
            if (store2.has('apk')) {
                const data = store2.get('apk');
                this.checking = true;
                $.get('/api/browse', { id: data.id, path: '/' })
                    .always(() => this.checking = false)
                    .then(() => {
                        this.apk = data;
                        this.status = 'successful'
                    })
            }
        },
    }

export function persistentStore(key, defaults, methods) {
  const backingStore = store(Object.assign(defaults, storage.get(key), methods));

  observe(function () {
    storage.set(key, backingStore);
  });

  return backingStore;
}