Interface MutateResult<TData>

The data returned from your mutation. Can be undefined if the errorPolicy is all or ignore and the server returns a GraphQL response with errors but not data or a network error is returned.

If the mutation produces one or more errors, this object contains either an array of graphQLErrors or a single networkError. Otherwise, this value is undefined.

For more information, see Handling operation errors.

Custom extensions returned from the GraphQL server