wekan/packages/wekan-cfs-filesystem/filesystem.client.js

// On the client we have just a shell
FS.Store.FileSystem = function(name, options) {
  var self = this;
  if (!(self instanceof FS.Store.FileSystem))
    throw new Error('FS.Store.FileSystem missing keyword "new"');

  return new FS.StorageAdapter(name, options, {
    typeName: 'storage.filesystem'
  });
};