Union type representing all possible messages that can be yielded during request processing.
Note: Progress notifications are handled through the existing onprogress callback mechanism.
Side-channeled messages (server requests/notifications) are handled through registered handlers.
Union type representing all possible messages that can be yielded during request processing. Note: Progress notifications are handled through the existing onprogress callback mechanism. Side-channeled messages (server requests/notifications) are handled through registered handlers.