The TC39 observable proposal defines a closed property, but some implementations (such as xstream) do not as of 10/08/2021. As well, some guidance on making an Observable to not include closed property.
closed
Observable
Remarks
The TC39 observable proposal defines a
closedproperty, but some implementations (such as xstream) do not as of 10/08/2021. As well, some guidance on making anObservableto not includeclosedproperty.See