Build fails with duplicate export default when used with starlight-scroll-to-top

[gesslar]

Description

When starlight-codeblock-fullscreen (v0.1.4) is used alongside starlight-scroll-to-top (v0.4.0), the build fails with a Duplicate export "default" error in the bundled page script.

Reproduction

astro.config.mjs:

import starlight from '@astrojs/starlight';
import starlightScrollToTop from 'starlight-scroll-to-top';
import starlightCodeblockFullscreen from 'starlight-codeblock-fullscreen';

export default defineConfig({
  integrations: [
    starlight({
      plugins: [
        starlightScrollToTop(),
        starlightCodeblockFullscreen(),
      ],
      // ...
    }),
  ],
});

npm run build output:

[ERROR] [vite] ✗ Build failed in 13ms
astro:scripts/page.js (1624:0): Duplicate export "default"
file: astro:scripts/page.js:1624:0

1622: }
1623:
1624: export default initECFullscreen;
      ^

Environment

• starlight-codeblock-fullscreen: 0.1.4
• starlight-scroll-to-top: 0.4.0
• @astrojs/starlight: 0.38.2
• astro: 6.0.1
• Node: 24.14.0

Notes

• Removing either plugin resolves the issue — the conflict is specifically between these two.
• Both plugins appear to inject scripts into the page, and the bundler merges them into astro:scripts/page.js with conflicting export default statements.
• starlight-heading-badges (v0.7.0) works fine alongside both plugins individually.

[gesslar]

FIRST!!!!!!!!!!!

[frostybee]

@gesslar Thanks for letting me know! It has been fixed in v1.0.0

However, please note that I may archive this plugin in favor of https://frostybee.github.io/expressive-code-fullscreen/