Method once

lib/core/bus.ts:107–107

(
    event: EVENT_LIST.DNS_LOOKUP_SUCCESS,
    listener: (payload: string | dns.LookupAddress[]) => void
  )

  ): this;

  once(
    event: EVENT_LIST.DNS_LOOKUP_SUCCESS,
    listener: (payload: string | dns.LookupAddress[]) => void
  ): this;