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Filename : fouc.js

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// This wrapper function is used to safely select the best available function
// to schedule removal of the no-FOUC styles workaround. requestAnimationFrame
// is the ideal choice, but when used in iframes, there are no guarantees that
// the callback will actually be called, which could stall the promise returned
// from displayContent.
//
// See: https://www.vector-logic.com/blog/posts/on-request-animation-frame-and-embedded-iframes
const safeCallbackQueue = (callback)=>{
    if (window.requestAnimationFrame && window.self === window.top) {
        window.requestAnimationFrame(callback);
    } else {
        window.setTimeout(callback);
    }
};
// This function is used to remove Next.js' no-FOUC styles workaround for using
// `style-loader` in development. It must be called before hydration, or else
// rendering won't have the correct computed values in effects.
export function displayContent() {
    return new Promise((resolve)=>{
        safeCallbackQueue(function() {
            for(var x = document.querySelectorAll("[data-next-hide-fouc]"), i = x.length; i--;){
                x[i].parentNode.removeChild(x[i]);
            }
            resolve();
        });
    });
}

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