code: function fetch_query() {
              const key = arg.query_id;
              let value = store_struct.query_result_map.get(key);
              if (endpoint_payload) {
                  value = {
                      query: String(arg.query_string),
                      result: JSON.parse(JSON.stringify(endpoint_payload)),
                      }; // eslint-disable-line indent
                  store_struct.query_result_map.set(key, value);
              }
              return value
                  && (String(arg.query_string) === value.query || undefined)
                  && value.result
                  ; // eslint-disable-line indent
          }
docs: /* eslint-enable indent -----------