Ldapsearch to ldapjs conversion

I've been trying to convert the following ldapsearch query

ldapsearch -H ldap://ldap.berkeley.edu -x -b 'ou=people,dc=berkeley,dc=edu' objectclass=*

to an ldapjs script:

var ldap = require('ldapjs');
var server = 'ldap://ldap.berkeley.edu';
var searchBase = 'ou=people,dc=berkeley,dc=edu';

var client = ldap.createClient({
  url: server
});

var opts = {
  filter: '(objectclass=*)'
}; 

client.search(searchBase, opts, function(err, res) {
  res.on('searchEntry', function (entry) {
    console.log(entry.toString());
  });
});

The ldapsearch gives me plenty of results but ldapjs doesn't return any users.
You can find some attempts of solving this on GitHub.