Readonly
[toAttaches a callback that is invoked when the Promise is settled (fulfilled or rejected). The resolved value cannot be modified from the callback.
Optional
onfinally: null | (() => void)The callback to execute when the Promise is settled (fulfilled or rejected).
A Promise for the completion of the callback.
Attaches callbacks for the resolution and/or rejection of the Promise.
A Promise for the completion of which ever callback is executed.
A promise that exploits a single, memory-safe upstream subscription to a single re-used Unpromise that persists for the VM lifetime of a Promise.
Calling unsubscribe() removes the subscription, eliminating all references to the SubscribedPromise.