dnscontrol/documentation/functions/domain/ALIAS.md

name	parameters	parameter_types
ALIAS	name target modifiers...	name target modifiers... string string RecordModifier[]

ALIAS is a virtual record type that points a record at another record. It is analogous to a CNAME, but is usually resolved at request-time and served as an A record. Unlike CNAMEs, ALIAS records can be used at the zone apex (@)

Different providers handle ALIAS records differently, and many do not support it at all. Attempting to use ALIAS records with a DNS provider type that does not support them will result in an error.

The name should be the relative label for the domain.

Target should be a string representing the target. If it is a single label we will assume it is a relative name on the current domain. If it contains any dots, it should be a fully qualified domain name, ending with a ..

D("example.com", REGISTRAR, DnsProvider("CLOUDFLARE"),
  ALIAS("@", "google.com."), // example.com -> google.com
);