code: function or(other) {
      return function (source) {
          return __asyncGenerator(this, arguments, function* () {
              var e_28, _a;
              let hasYieldedItem = false;
              try {
                  for (var source_1 = __asyncValues(source), source_1_1; source_1_1 = yield __await(source_1.next()), !source_1_1.done;) {
                      const item = source_1_1.value;
                      yield yield __await(item);
                      hasYieldedItem = true;
                  }
              }
              catch (e_28_1) { e_28 = { error: e_28_1 }; }
              finally {
                  try {
                      if (source_1_1 && !source_1_1.done && (_a = source_1.return)) yield __await(_a.call(source_1));
                  }
                  finally { if (e_28) throw e_28.error; }
              }
              if (!hasYieldedItem) {
                  yield __await(yield* __asyncDelegator(__asyncValues(other)));
              }
          });
      };
  }
docs: Return the specified iterable if the source iterable is empty