code: function(hostname) {
      if ( pslBuffer32 === undefined ) { return EMPTY_STRING; }
  
      const hostnameLen = setHostnameArg(hostname);
      const buf8 = pslBuffer8;
      if ( hostnameLen === 0 || buf8[0] === 0x2E /* '.' */ ) {
          return EMPTY_STRING;
      }
  
      const cursorPos = getPublicSuffixPos();
      if ( cursorPos === -1 ) {
          return EMPTY_STRING;
      }
  
      const beg = buf8[cursorPos + 1];
      return beg === 0 ? hostnameArg : hostnameArg.slice(beg);
  }
docs: ***************************************************************************