The `link` HTTP header in SSR breaks the import maps

Describe the bug

I'm using node adaptor and I found when doing SSR, the server adds a link HTPP header to indicate the browser to preload things.

However, I'm using import maps as well. According to the standard, the import map must be declared and processed before any <script> elements, so those scripts preloaded in the link header break my import maps.

Reproduction

https://github.com/hronro/sveltekit-http-link-importmap-issue

The problem only exists in production build.

Logs

No response

System Info

System:
    OS: Linux 6.6 Arch Linux
    CPU: (14) x64 AMD Ryzen 7 5800X 8-Core Processor
    Memory: 24.67 GB / 27.41 GB
    Container: Yes
    Shell: 3.6.1 - /usr/bin/fish
  Binaries:
    Node: 21.2.0 - /usr/bin/node
    Yarn: 1.22.19 - /usr/bin/yarn
    npm: 10.2.4 - /usr/bin/npm
    pnpm: 8.10.2 - /usr/bin/pnpm
    bun: 1.0.0 - /usr/local/bin/bun
  npmPackages:
    @sveltejs/adapter-auto: ^2.0.0 => 2.1.1
    @sveltejs/adapter-node: ^1.3.1 => 1.3.1
    @sveltejs/kit: ^1.27.4 => 1.27.6
    svelte: ^4.0.5 => 4.2.4
    vite: ^4.4.2 => 4.5.0

Severity

blocking all usage of SvelteKit

Additional Information

No response

Start by running the linked reproduction in a production build with the node adapter and import maps enabled. Inspect the SSR response handling that adds the HTTP Link preload header; done means import maps are processed correctly without incompatible preloads, while other SSR behavior remains intact.