I think we are all here to help each other out & none of the code is copy-writed, so re-use should not be a problem. The biggest question is how best to reuse it.
The “best” way is probably just to include the node & note that your library depends on the additional library, but that dependency is going to be annoying for everyone trying to use your library if it is only using a single node.
You can also duplicate the node in your own library; ideally adding comment indicating where you found the code originally. This means you will not get updates for bug fixes (or changes in functionality that might break your code). Copying many nodes from another library rather than just depending on the additional library would probably be bad form…