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FOUC while loading javascript style library that needs to be loaded before DOM loading #6227

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FOUC while loading javascript style library that needs to be loaded before DOM loading#6227
@bhvngt

Description

@bhvngt
bhvngt
opened on Aug 24, 2022

Describe the bug

As per this comment from @Rich-Harris, after #6174 FOUC should not be possible when we are importing global css within root layout.

I have been using a style javascript library that needs to be loaded before any DOM content gets loaded. I could see FOUC happening. This is different than the scenario where styles are imported which, as per the comment, gets imported as style tag.

Reproduction

https://stackblitz.com/edit/sveltejs-kit-template-default-7xrgjy?file=src%2Froutes%2F%2Blayout.svelte,package.json,package-lock.json&terminal=dev

In the following reproduction one can see a flicker of FOUC TEST happening on the right hand side of the band. It's best to see the preview in a separate tab.

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System Info

@sveltejs/kit: 1.0.0-next.431
vite: 3.0.9

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annoyance

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