function getUpgradeVersionimport { getUpgradeVersion } from "https://deno.land/x/polkadot@0.2.39/types-known/mod.ts"; getUpgradeVersion(genesisHash: Hash, blockNumber: BN): [ChainUpgradeVersion | undefined, ChainUpgradeVersion | undefined]ParametersgenesisHash: HashblockNumber: BNReturns[ChainUpgradeVersion | undefined, ChainUpgradeVersion | undefined]