gistfile1.txt

userSearchTactic(req:UserSeachRequest, ctx: Context): Rx.Observable<UserSearch> {
  return ctx
    .localDataStore
    .objectsByType(User) // Rx.Observable<User>
    .filter((user: User) => user.matches(req))
    .reduce((user: User, results: UserSearch) => results.users.push(user), new UserSearch());
}