import { type BlockNumberDerive } from "https://dotland.deno.dev/x/polkadot@0.2.35/api-derive/chain/util.ts";
definition: (instanceId: string, api: DeriveApi) => () => Observable<BlockNumber>
x/polkadot/api-derive/chain/util.ts>BlockNumberDerive
import { type BlockNumberDerive } from "https://dotland.deno.dev/x/polkadot@0.2.35/api-derive/chain/util.ts";