673 function urlResolve(source, relative) {  argument
674   return urlParse(source, false, true).resolve(relative);
677 Url.prototype.resolve = function resolve(relative) {  argument
678   return this.resolveObject(urlParse(relative, false, true)).format();
681 function urlResolveObject(source, relative) {  argument
682   if (!source) return relative;
683   return urlParse(source, false, true).resolveObject(relative);
686 Url.prototype.resolveObject = function resolveObject(relative) {  argument
687   if (typeof relative === 'string') {
689     rel.parse(relative, false, true);
690     relative = rel;
702   result.hash = relative.hash;
705   if (relative.href === '') {
711   if (relative.slashes && !relative.protocol) {
713     const rkeys = ObjectKeys(relative);
717         result[rkey] = relative[rkey];
730   if (relative.protocol && relative.protocol !== result.protocol) {
739     if (!slashedProtocol.has(relative.protocol)) {
740       const keys = ObjectKeys(relative);
743         result[k] = relative[k];
749     result.protocol = relative.protocol;
750     if (!relative.host &&
751         !/^file:?$/.test(relative.protocol) &&
752         !hostlessProtocol.has(relative.protocol)) {
753       const relPath = (relative.pathname || '').split('/');
754       while (relPath.length && !(relative.host = relPath.shift()));
755       if (!relative.host) relative.host = '';
756       if (!relative.hostname) relative.hostname = '';
761       result.pathname = relative.pathname;
763     result.search = relative.search;
764     result.query = relative.query;
765     result.host = relative.host || '';
766     result.auth = relative.auth;
767     result.hostname = relative.hostname || relative.host;
768     result.port = relative.port;
775     result.slashes = result.slashes || relative.slashes;
782     relative.host || (relative.pathname && relative.pathname.charAt(0) === '/')
785                     (result.host && relative.pathname));
788   const relPath = (relative.pathname && relative.pathname.split('/')) || [];
805     if (relative.protocol) {
806       relative.hostname = null;
807       relative.port = null;
809       if (relative.host) {
810         if (relPath[0] === '') relPath[0] = relative.host;
811         else relPath.unshift(relative.host);
813       relative.host = null;
820     if (relative.host || relative.host === '') {
821       if (result.host !== relative.host) result.auth = null;
822       result.host = relative.host;
823       result.port = relative.port;
825     if (relative.hostname || relative.hostname === '') {
826       if (result.hostname !== relative.hostname) result.auth = null;
827       result.hostname = relative.hostname;
829     result.search = relative.search;
830     result.query = relative.query;
839     result.search = relative.search;
840     result.query = relative.query;
841   } else if (relative.search !== null && relative.search !== undefined) {
857     result.search = relative.search;
858     result.query = relative.query;
886     ((result.host || relative.host || srcPath.length > 1) &&
957   result.auth = relative.auth || result.auth;
958   result.slashes = result.slashes || relative.slashes;