Vitest failing when importing from $lib in a test file. How do I fix it?

[Glench]

When I try to use a library from $lib in a *.test.ts file, vitest-run fails with the following error:

Error: Cannot find package '__sveltekit' imported from node_modules/@sveltejs/kit/src/runtime/shared.js

Any ideas how I can fix this? I just updated to the latest stuff:

npmPackages:
   @sveltejs/adapter-auto: ^1.0.0 => 1.0.3
   @sveltejs/kit: ^1.0.0 => 1.7.2
   svelte: ^3.54.0 => 3.55.1
   vite: ^4.0.0 => 4.1.1

[Glench]

Looks like this was because I was using import {dev} from '$app/environment'. I switched to import {DEV} from 'esm-env' ((link)[https://github.com/benmccann/esm-env])) and it worked.