The signal is aborted when the attempt is cancelled — on a timeout
deadline, or when the caller aborts the signal it passed to the
HardenedCall. A call that forwards the signal to the I/O it
performs (fetch(url, { signal }), an abortable driver) is genuinely
cancelled; a call that ignores it still runs to completion, and only the
caller's await rejects.
Declaring the parameter does not oblige an implementation to accept it: a
zero-argument () => Promise<T> remains assignable here, so callers written
against the pre-cancellation signature continue to type-check unchanged.
A call protected by the resilience patterns.
The
signalis aborted when the attempt is cancelled — on atimeoutdeadline, or when the caller aborts the signal it passed to theHardenedCall. A call that forwards the signal to the I/O it performs (fetch(url, { signal }), an abortable driver) is genuinely cancelled; a call that ignores it still runs to completion, and only the caller'sawaitrejects.Declaring the parameter does not oblige an implementation to accept it: a zero-argument
() => Promise<T>remains assignable here, so callers written against the pre-cancellation signature continue to type-check unchanged.