How to use the @converse/headless/utils/core.isSameDomain function in @converse/headless

_converse.setUserJID = async function (jid) {
    if (!_converse.connection || !u.isSameDomain(_converse.connection.jid, jid)) {
        const domain = Strophe.getDomainFromJid(jid)
        await _converse.initConnection(domain);
    }
    await initSession(jid);
    /**
     * Triggered whenever the user's JID has been updated
     * @event _converse#setUserJID
     */
    _converse.api.trigger('setUserJID');
    return jid;
}