import { ApiPromise } from "@polkadot/api";
export declare abstract class BaseProviderElement extends HTMLElement {
    private static readonly providerAttribute;
    protected api?: ApiPromise;
    constructor();
    /**
     * The eventual provider encapsulated by this `BaseProviderElement`
     */
    get provider(): string | null;
    /**
     * Sets the provider attribute
     */
    set provider(provider: string | null);
    static get observedAttributes(): string[];
    fireApiChangedEvent(api?: ApiPromise): void;
    attributeChangedCallback(name: string, oldValue: any, newValue: any): void;
}