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import type { AccountId, Header } from 'https://deno.land/x/polkadot@0.2.33/types/interfaces/index.ts';import type { Registry } from 'https://deno.land/x/polkadot@0.2.33/types/types/index.ts';import type { HeaderExtended } from './types.ts';
import { extractAuthor } from './util.ts';
export function createHeaderExtended (registry: Registry, header?: Header, validators?: AccountId[] | null, author?: AccountId | null): HeaderExtended {  // an instance of the base extrinsic for us to extend  const HeaderBase = registry.createClass('Header');
  class Implementation extends HeaderBase implements HeaderExtended {    readonly #author?: AccountId;
    constructor (registry: Registry, header?: Header, validators?: AccountId[] | null, author?: AccountId | null) {      super(registry, header);
      this.#author = author || extractAuthor(this.digest, validators || []);      this.createdAtHash = header?.createdAtHash;    }
    /**     * @description Convenience method, returns the author for the block     */    public get author (): AccountId | undefined {      return this.#author;    }  }
  return new Implementation(registry, header, validators, author);}