Type Alias Normalize<T>

Normalize: T extends undefined
    ? never
    : T extends Record<any, any>
        ? Flatten<
            { [k in keyof Omit<T, "error" | "message">]: T[k] } & (
                "error" extends keyof T
                    ? { error?: Exclude<T["error"], string> }
                    : unknown
            ),
        >
        : never