function createHeaderExtendedimport { createHeaderExtended } from "https://deno.land/x/polkadot@0.2.12/api-derive/mod.ts"; createHeaderExtended(registry: Registry,header?: Header,validators?: AccountId[] | null,author?: AccountId | null,): HeaderExtendedParametersregistry: Registryoptionalheader: Headeroptionalvalidators: AccountId[] | nulloptionalauthor: AccountId | nullReturnsHeaderExtended