Regression in `@sveltejs/package@2.5.2` with alias resolution

[x0k]

Describe the bug

In the previous version, the resolution of this alias worked: export type { foo } from '@/foo/index.js';.
svelte.config.js

const config = {
  kit: {
    adapter: adapter(),
    alias: {
      '@/': './src/',
    },
  },
};

Reproduction

StackBlitz

See the dist/index.d.ts file after npm i && npm run build.

Logs

System Info

System:
    OS: Linux 6.12 cpe:/o:nixos:nixos:25.05 25.05 (Warbler)
    CPU: (12) x64 Intel(R) Core(TM) i5-10400F CPU @ 2.90GHz
    Memory: 3.59 GB / 15.56 GB
    Container: Yes
    Shell: 5.2.37 - /run/current-system/sw/bin/bash
  Binaries:
    Node: 24.6.0 - /nix/store/90v6af579yzsqdqivfkbkdkra365kkv4-nodejs-24.6.0/bin/node
    npm: 11.5.1 - /nix/store/90v6af579yzsqdqivfkbkdkra365kkv4-nodejs-24.6.0/bin/npm
    pnpm: 10.15.0 - /nix/store/qzw56f9vai5jg9dm3wbm45r6cc6b65d8-pnpm-10.15.0/bin/pnpm
  Browsers:
    Brave Browser: 139.1.81.131
  npmPackages:
    svelte: catalog: => 5.38.6

Severity

blocking an upgrade

Additional Information

No response