How to use the node-persist.removeItem function in node-persist

async remove(url) {
        // remove from library
        await this.ready;
        const archiveInfo = await storage.getItem(url);
        if (!archiveInfo) {
            throw new Error('Archive not in library');
        }
        // close archive
        await this.close(url);
        await storage.removeItem(url);
        return archiveInfo;
    }

const loadLibrary = library.map(async ({ url }) => {
                try {
                    const address = await dns.resolveName(url);
                    const dat = await this.node.getDat(address, datOpts);
                    await dat.ready;
                    const archive = createDatArchive(dat.drive);
                    this.archives.set(address, archive);
                } catch (e) {
                    // failed to load archive, remove from library
                    await storage.removeItem(url);
                }
            });

return new Promise((resolve) => {
        PersistStorage.removeItem(key)
          .then(() => resolve(true))
          .catch(() => resolve(false));
      });
    } catch(error) {

exports.member_delete = async function(req, res) {
  const navigate =
    {
      active: 'networks',
      whence: ''
    }

  try {
    const network = await zt.network_detail(req.params.nwid);
    let member = null;
    let name = null;
    if (req.method === 'POST') {
      member = await zt.member_delete(req.params.nwid, req.params.id);
      if (member.deleted) {
        name = await storage.removeItem(member.id);
      }
    } else {
      member = await zt.member_detail(req.params.nwid, req.params.id);
      name = await storage.getItem(member.id);
    }
    if (!name) name = '';
    member.name = name;

    navigate.whence = '/controller/network/' + network.nwid + '/members';
    res.render('member_delete', {title: 'Delete member from ' + network.name,
                                  navigate: navigate, network: network, member: member});
  } catch (err) {
    res.render('member_delete', {title: 'Delete member from network', navigate: navigate,
                    error: 'Error resolving detail for member ' + req.params.id
                              + ' of network ' + req.params.nwid + ': ' + err});
  }