error.ts

Argument of type '({ req, res, }: GetServerSidePropsContext<ParsedUrlQuery, PreviewData>) => Promise<{ props: { user: User; data?: undefined; }; } | { ...; }>' is not assignable to parameter of type '(context: GetServerSidePropsContext<ParsedUrlQuery, PreviewData>) => GetServerSidePropsResult<{ user: User; data?: undefined; }> | Promise<...>'.
  Type 'Promise<{ props: { user: User; data?: undefined; }; } | { props: { user: User | undefined; data: string; }; }>' is not assignable to type 'GetServerSidePropsResult<{ user: User; data?: undefined; }> | Promise<GetServerSidePropsResult<{ user: User; data?: undefined; }>>'.
    Type 'Promise<{ props: { user: User; data?: undefined; }; } | { props: { user: User | undefined; data: string; }; }>' is not assignable to type 'Promise<GetServerSidePropsResult<{ user: User; data?: undefined; }>>'.
      Type '{ props: { user: User; data?: undefined; }; } | { props: { user: User | undefined; data: string; }; }' is not assignable to type 'GetServerSidePropsResult<{ user: User; data?: undefined; }>'.
        Type '{ props: { user: User | undefined; data: string; }; }' is not assignable to type 'GetServerSidePropsResult<{ user: User; data?: undefined; }>'.
          Type '{ props: { user: User | undefined; data: string; }; }' is not assignable to type '{ props: { user: User; data?: undefined; } | Promise<{ user: User; data?: undefined; }>; }'.
            Types of property 'props' are incompatible.
              Type '{ user: User | undefined; data: string; }' is not assignable to type '{ user: User; data?: undefined; } | Promise<{ user: User; data?: undefined; }>'.
                Type '{ user: User | undefined; data: string; }' is not assignable to type '{ user: User; data?: undefined; }'.
                  Types of property 'user' are incompatible.
                    Type 'User | undefined' is not assignable to type 'User'.
                      Type 'undefined' is not assignable to type 'User'.ts(2345)