Implementación con Next.js

// ⛔ No "use client" here - must stay server-side
import { SITECODE_SRC } from "./sitecode";

const ANTIFLICKER_CSS = `
html::after {
    content: '';
    position: fixed;
    inset: 0;
    background: #fff;
    z-index: 2147483647;
}`;

export function KameleoonHead() {
    return (
        <>
            {/* Preload the engine so browser begins downloading ASAP */}
            <link rel="preload" href={SITECODE_SRC} as="script" fetchPriority="high" />
            {/* Anti-flicker stylesheet injected during SSR */}
            <style
                id="kameleoonLoadingStyleSheet"
                suppressHydrationWarning
                dangerouslySetInnerHTML={{ __html: ANTIFLICKER_CSS }}
            />
        </>
    );
}

"use client";

import { useCallback, useEffect } from "react";
import { SITECODE_SRC } from "./sitecode";

export function KameleoonHydrationReady() {
    const removeAntiflickerStyles = useCallback(() => {
        const kameleoonLoadingTimeout = 500;
        window.kameleoonQueue = window.kameleoonQueue || [];
        window.kameleoonStartLoadTime = Date.now();

        window.kameleoonDisplayPage = function (fromEngine) {
            if (!fromEngine) {
                window.kameleoonTimeout = true;
            }
            document.getElementById("kameleoonLoadingStyleSheet")?.remove();
        };

        window.kameleoonDisplayPageTimeOut = setTimeout(
            window.kameleoonDisplayPage,
            kameleoonLoadingTimeout
        );
    }, []);

    const loadEngine = useCallback(() => {
        if (document.getElementById("kameleoon-engine")) return;

        const script = document.createElement("script");
        script.src = SITECODE_SRC;
        script.async = true;
        script.id = "kameleoon-engine";
        document.head.appendChild(script);
    }, []);

    // Execute Kameleoon after hydration
    useEffect(() => {
        removeAntiflickerStyles();
        loadEngine();
    }, [loadEngine, removeAntiflickerStyles]);

    return null;
}

export default function RootLayout({ children }) {
    return (
        <html lang="en">
            <head>
                <KameleoonHead />
            </head>
            <body className={inter.className}>
                <KameleoonHydrationReady />
                {children}
            </body>
        </html>
    );
}