@ajayjaggi97 I've tried for the last 3 days to get it to work with next.js and I'm finally happy to use it.
First of all: I want to use it for a component-library and not directly in next.js. I think for direct usage, next.js already has a nice system through the *.module.scss/css-files.

This is where the magic happens: Here is the content of my _app.tsx:

export default function MyApp({ }: AppProps) {
    const styles: string[] = useMemo(() => [], []);

    const addStyles = useCallback(
        (...newStyles) => {
            if (typeof document === 'undefined') {
                styles.push(...newStyles.map((s) => s._getCss()));
            } else {
                newStyles.forEach((s) => s._insertCss());
            }
        },
        [styles]
    );

    return (
        <>
            <StyleProvider value={{ insertCss: addStyles }}>
                <ColorInput />
            </StyleProvider>
            <StyleRenderer styles={styles} />
        </>
    );
}

and my StyleRenderer.tsx:

export type StyleRendererProps = { styles: string[] };

export function StyleRenderer({ styles }: StyleRendererProps) {
    return (
        <Head>
            <style>{styles.join()}</style>
        </Head>
    );
}

Note that I use useMemo in order to save the styles and StyleRenderer, which only displays the styles. This is because of how nextjs works. Once the rendermethod is done, you can't trigger an rerender on the server, regardless what you do (or at least I could not trigger one). But subcomponents are still rendering. Since the components are called top-down, the ColorInput is called before the StyleRenderer. Inside the ColorInput I use the useStyles hook, which calls addStyles from _app.tsx. Since I used useMemo for styles, it is the same instance inside addStyles as is passed to StyleRenderer,
Since StyleRenderer renders last, it will render all the styles needed inside the server rendering.
On the client, I just use the s._insertCss() method without any problems.

And also note that I did not use StyleContext.Provider but StyleProvier which is an reexport of StyleContext.Provider from my component-library. This is needed or else the context used from useStyles inside the library is a different one than the one provides through StyleContext.Provider inside next.js

Support for next.js #204

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