export default async function fileExists(url: string): Promise<boolean> {
    return new Promise((resolve) => {
        const xhr = new XMLHttpRequest();
        xhr.open('HEAD', url);
        xhr.onload = function checkLoad() {
            if (xhr.readyState === 4) {
                if (xhr.status === 200) {
                    resolve(true);
                } else {
                    resolve(false);
                }
            }
        };
        xhr.onerror = function checkError() {
            resolve(false);
        };
        xhr.send(null);
    });
}