promise

type Promise[T any] interface {
	// Await blocks until the value is resolved or rejected.
	Await(context.Context) (T, error)
}

type Resolver[T any] interface {
	// Resolve a promise. Unblocks all Await()s. Future calls of Await()
	// return the resolved value immediately.
	//
	// Only the first call to resolve (or reject) has an effect and
	// further calls are ignored.
	Resolve(T)

	// Reject a promise with an error.
	Reject(error)
}