export default abstract class CustomHTMLBaseElement extends HTMLElement {
    constructor();
    applyCustomStyle(customStyle: HTMLStyleElement): void;
    replaceCustomStyle(customStyle: HTMLStyleElement): void;
    getElement<T extends HTMLElement>(): T;
    getChildElement<T extends HTMLElement>(selector: string): T;
    fillContent(content: string | HTMLElement): void;
    getChildElements<T>(selector: string): T[];
    hasChildElement(childElement: HTMLElement): boolean;
    appendChildElement(child: HTMLElement): void;
    removeChildElement(child: HTMLElement): void;
}