sigh

Author: Rich-Harris

packages/kit/test/apps/options/source/hooks.server.js

@@ -2,6 +2,7 @@ import { env } from '$env/dynamic/private';
 
 // this verifies that dynamic env vars can be read during analysis phase
 // (it would fail if this app contained prerendered routes)
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
 const FOO = env.FOO;
 
 /** @type {import('@sveltejs/kit').Handle} */

packages/kit/types/index.d.ts

@@ -2185,11 +2185,16 @@ declare module '__sveltekit/environment' {
 	 * SvelteKit analyses your app during the `build` step by running it. During this process, `building` is `true`. This also applies during prerendering.
 	 */
 	export const building: boolean;
+	/**
+	 * True during prerendering, false otherwise.
+	 */
+	export const prerendering: boolean;
 	/**
 	 * The value of `config.kit.version.name`.
 	 */
 	export const version: string;
 	export function set_building(): void;
+	export function set_prerendering(): void;
 }
 
 /** Internal version of $app/paths */