code: function getExportDefaultTempVariableName() {
              var baseName = "_default";
              if (!(baseName in currentIdentifiers)) {
                  return baseName;
              }
              var count = 0;
              while (true) {
                  count++;
                  var name_23 = baseName + "_" + count;
                  if (!(name_23 in currentIdentifiers)) {
                      return name_23;
                  }
              }
          }
docs: Return a temp variable name to be used in `export default` statements. The temp name will be of the form _default_counter. Note that export default is only allowed at most once in a module, so we do not need to keep track of created temp names.