Next js static export unstyled html flash. [FOUC]

Question

I am working with next.js and everything seems to be fine when I am using app with npm run dev.

But when I am exporting my next.js app to a static files with command npm run build and trying to open my project for part of the second the screen is unstyled, this cause verry bad user experience.

I know this is called FOUC but how to avoid it on next.js static export?

P.S I am using styled-components library, not sure if that affecting the final result.

Answer 1

If you are using styled-components, I would look into modifying your _document.js file per these instructions: https://styled-components.com/docs/advanced#server-side-rendering

That's how I managed to get out FOUC after trying a bunch of random stuff like:

• putting a loader
• putting a <script>0</script> tag
• etc..