Optimistic Updates with TRPC (react-query)?

 const queryClient = useQueryClient();

    const updateWord = trpc.word.update.useMutation({
        onMutate: async newTodo => {
            // Cancel any outgoing refetches (so they don't overwrite our optimistic update)
            await queryClient.cancelQueries({ queryKey: ['text', 'getOne'] })

            // Snapshot the previous value
            const previousText = queryClient.getQueryData(['text', 'getOne'])

            // Optimistically update to the new value
            queryClient.setQueryData(['text', 'getOne'], old => old ? {...old, { title: "Hello" }} : undefined)

            // Return a context object with the snapshotted value
            return { previousText }
        },
//...

 const queryClient = useQueryClient();

    const updateWord = trpc.word.update.useMutation({
        onMutate: async newTodo => {
            // Cancel any outgoing refetches (so they don't overwrite our optimistic update)
            await queryClient.cancelQueries({ queryKey: ['text', 'getOne'] })

            // Snapshot the previous value
            const previousText = queryClient.getQueryData(['text', 'getOne'])

            // Optimistically update to the new value
            queryClient.setQueryData(['text', 'getOne'], old => old ? {...old, { title: "Hello" }} : undefined)

            // Return a context object with the snapshotted value
            return { previousText }
        },
//...