Vercel build fails with monorepo: Error: [Upstash Redis] The 'url' property is missing or undefined in your Redis config.

[ahkhanjani]

I just abstracted @vercel/kv into a Turborepo package to use a shared client between my apps using createClient. My local builds are fine but on Vercel my build fails with the error in the title. Here's my client creation code:

import { createClient } from "@vercel/kv";

export const kv = createClient({
  url: process.env.KV_REST_API_URL,
  token: process.env.KV_REST_API_TOKEN,
});

My environment variables are stored in the root .env file.