code: function map(mapper) {
      return function (iterable) {
          return __asyncGenerator(this, arguments, function* () {
              var e_2, _a;
              let index = 0;
              try {
                  for (var iterable_1 = __asyncValues(iterable), iterable_1_1; iterable_1_1 = yield __await(iterable_1.next()), !iterable_1_1.done;) {
                      const value = iterable_1_1.value;
                      yield yield __await(mapper(value, index));
                      index = index + 1;
                  }
              }
              catch (e_2_1) { e_2 = { error: e_2_1 }; }
              finally {
                  try {
                      if (iterable_1_1 && !iterable_1_1.done && (_a = iterable_1.return)) yield __await(_a.call(iterable_1));
                  }
                  finally { if (e_2) throw e_2.error; }
              }
          });
      };
  }
docs: Yield a new iterable sequence that applies the mapper to every item in the original