export declare const customElements: CustomElementRegistry;
export declare const HTMLElement: CustomElementConstructor;
export interface CustomElement extends HTMLElement {
    attributeChangedCallback?(name: string, oldValue: string | null, newValue: string | null): void;
    connectedCallback?(): void;
    disconnectedCallback?(): void;
}
export interface CustomElementConstructor<T = CustomElement> {
    new (...args: any[]): globalThis.HTMLElement & T;
    observedAttributes?: string[];
    formAssociated?: boolean;
}