import { LitElement } from "lit";
export declare class BaseElement extends LitElement {
    static customElementRegistry: CustomElementRegistry;
    static baseName: string;
    static define(name?: string, ctor?: CustomElementConstructor, options?: ElementDefinitionOptions): void;
    internals?: ElementInternals;
    constructor();
    addCustomState(state: string): void;
    deleteCustomState(state: string): void;
    hasCustomState(state: string): boolean | undefined;
    toggleCustomState(state: string, force?: boolean): void;
}
export type Constructor = new (...args: any[]) => {};
export declare function toAnonymousClass<T extends Constructor>(klass: T): T;