[Exim] aliasfile and Exim4

Hi

    In my exim3 configuration file I had the following director:

virtual_aliases:
driver = aliasfile
domains = "partial-lsearch;/etc/exim/DOMAINS"
file_transport = address_file
pipe_transport = address_pipe
file = /etc/exim/${domain_data}
search_type = "lsearch*"

This enabled me to create alias files per each domain. How can I achieve the
same in exim 4?

Thank you