Attaches 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 | CallableThe callback to execute when the Promise is settled (fulfilled or rejected).
A Promise for the completion of the callback.
An agnostic and chainable method to operate on a SyncPromise. It will execute asynchronously if values are pending, and synchronously otherwise.
Static
fromCreates a SyncPromise from a function.
A promise that will make its resolved or rejected values synchronously available and operable.