import "../../../_dnt.polyfills.js";
import { AddressPrefixChain, ChainRune, RunicArgs } from "../../../mod.js";
export declare function babeBlockAuthor<C extends AddressPrefixChain, U, X>(chain: ChainRune<C, U>, ...[blockHash]: RunicArgs<X, [blockHash: string]>): import("../../../mod.js").Ss58Rune<C, any>;
export declare class AuthorRetrievalNotSupportedError extends Error {
    readonly name = "AuthorRetrievalNotSupportedError";
}