code: function concat(...iterables) {
      return function (it) {
          return __asyncGenerator(this, arguments, function* () {
              var e_20, _a;
              yield __await(yield* __asyncDelegator(__asyncValues(it)));
              try {
                  for (var iterables_1 = __asyncValues(iterables), iterables_1_1; iterables_1_1 = yield __await(iterables_1.next()), !iterables_1_1.done;) {
                      const iterable = iterables_1_1.value;
                      yield __await(yield* __asyncDelegator(__asyncValues(iterable)));
                  }
              }
              catch (e_20_1) { e_20 = { error: e_20_1 }; }
              finally {
                  try {
                      if (iterables_1_1 && !iterables_1_1.done && (_a = iterables_1.return)) yield __await(_a.call(iterables_1));
                  }
                  finally { if (e_20) throw e_20.error; }
              }
          });
      };
  }
docs: Yields the passed iterables at the end of the current iterable