/* usage: window.getDeferred(<deferred name>).resolve() or window.getDeferred(<deferred name>).promise.then(...)*/
    function Def() {
        this.promise = new Promise((function (a, b) {
            this.resolve = a, this.reject = b
        }).bind(this))
    }

    const defs = {};
    window.getDeferred = function (a) {
        return null == defs[a] && (defs[a] = new Def), defs[a]
    }
    window.waitForDeferred = function (b, a, c) {
        let d = window?.getDeferred?.(b);
        d
            ? d.promise.then(a)
            : c && ["complete", "interactive"].includes(document.readyState)
                ? setTimeout(a, 1)
                : c
                    ? document.addEventListener("DOMContentLoaded", a)
                    : console.error(`Deferred  does not exist`);
    };