code: function distinct(it) {
      return __asyncGenerator(this, arguments, function* distinct_1() {
          var e_24, _a;
          const resultSet = new Set();
          try {
              for (var it_5 = __asyncValues(it), it_5_1; it_5_1 = yield __await(it_5.next()), !it_5_1.done;) {
                  const item = it_5_1.value;
                  if (!resultSet.has(item)) {
                      resultSet.add(item);
                      yield yield __await(item);
                  }
              }
          }
          catch (e_24_1) { e_24 = { error: e_24_1 }; }
          finally {
              try {
                  if (it_5_1 && !it_5_1.done && (_a = it_5.return)) yield __await(_a.call(it_5));
              }
              finally { if (e_24) throw e_24.error; }
          }
      });
  }
docs: Play unique items from a set