svelte-kit package extensions bug

This demonstrates the bug described in https://github.com/sveltejs/kit/issues/2040

• first, run pnpm install
• go to svelte-library/src/lib/index.ts
• notice the two different exports. One will work only in webpack but fail when used internally in src/routes, and the other vice-versa.
• both projects can be started with pnpm run dev, svelte-library can be built using pnpm run build