Object.assign(Element.prototype, {
    getFirstChildWithoutTagName: function (this: Element, tagName: string): Element | undefined {
        const children = this.childNodes as any;
        for (let i = 0; i < children.length; i++) {
            if (children[i].tagName && children[i].tagName !== (tagName as any).toUpperCase()) {
                return children[i];
            }
        }
        return undefined;
    },
    toggleClass: function (this: Element, className: string): void {
        if (this.classList.contains(className)) {
            this.classList.remove(className);
        } else {
            this.classList.add(className);
        }
    },
    getParentIf: function (this: Element, predicate?: (el: Element) => boolean): Element | null {
        let parent = this.parentElement;
        if (typeof predicate === 'function') {
            while (parent) {
                if ((predicate as any)(parent) !== false) {
                    return parent;
                }
                parent = parent.parentElement;
            }
            return null;
        }
        return parent;
    },
});