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The `expiration` property is required; all others are optional.
> Pages that are [prerendered](/docs/page-options#prerender) will ignore ISR configuration.
## Environment variables
Vercel makes a set of [deployment-specific environment variables](https://vercel.com/docs/concepts/projects/environment-variables#system-environment-variables) available. Like other environment variables, these are accessible from `$env/static/private` and `$env/dynamic/private` (sometimes — more on that later), and inaccessible from their public counterparts. To access one of these variables from the client: