function isAddressimport { isAddress } from "https://deno.land/x/polkadot@0.2.42/util-crypto/address/index.ts"; isAddress(address?: string | null,ignoreChecksum?: boolean,ss58Format?: Prefix,): address is stringParametersoptionaladdress: string | nulloptionalignoreChecksum: booleanoptionalss58Format: PrefixReturnsaddress is string