Detect whether cookies are enabled in the browser

cookies-enabled.js

function cookiesEnabled() {
    if (navigator.cookieEnabled) {
        return true;
    }
    document.cookie = 'cookietest=1';
    let enabled = document.cookie.indexOf("cookietest=") !== -1;
    document.cookie = 'cookietest=1; expires=Thu, 01-Jan-1970 00:00:01 GMT';
    return enabled;
}

if (cookiesEnabled()) {
    // Yay, cookies are enabled!
} else {
    // Oh no, we can't use cookies!
}