code: function(baseUrl, identiconString, width, height) {
          if (!identiconString) {
              return null;
          }
          if (!width) {
              width = 96;
          }
          if (!height) {
              height = 96;
          }
          const params = {
              width: width,
              height: height,
          };
  
          const path = utils.encodeUri("/_matrix/media/v1/identicon/$ident", {
              $ident: identiconString,
          });
          return baseUrl + path +
              (utils.keys(params).length === 0 ? "" :
                  ("?" + utils.encodeParams(params)));
      }
docs: Get an identicon URL from an arbitrary string.
  @param {string} baseUrl The base homeserver url which has a content repo.
  @param {string} identiconString The string to create an identicon for.
  @param {Number} width The desired width of the image in pixels. Default: 96.
  @param {Number} height The desired height of the image in pixels. Default: 96.
  @return {string} The complete URL to the identicon.