Best practices for implementing an offline application

const createUser = trpc.userCreate.useMutation({
        onMutate: async () => {
            // Cancel users fetch
            await utils.users.cancel()
            // Get current users list
            const previousData = utils.users.getData() || []
            // Append new user
            utils.users.setData([...previousData, { id: uuid.v1(), name } as User])
            return { previousData }
        },
    })