docs: function pureFunction1(slotOffset, pureFn, exp, thisArg) {
      ngDevMode && assertReservedSlotInitialized(slotOffset, 2);
      var index = moveBindingIndexToReservedSlot(slotOffset);
      var value = bindingUpdated(exp) ?
          checkAndUpdateBinding$1(thisArg ? pureFn.call(thisArg, exp) : pureFn(exp)) :
          consumeBinding();
      restoreBindingIndex(index);
      return value;
  }