Next js static export unstyled html flash. [FOUC]

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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.

2 Answers

Long shot that this is a fix for anyone else, but I saw this behavior when I mistakenly wrapped the entire page contents inside the head tag. Heh, oops.

So don't override Document with something like this like I did, make sure to close that head tag sooner:

<Html lang="en">
    <Head>
        <body>
            <Main />
            <NextScript />
        </body>
    </Head>
</Html>
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