function filterErasimport { filterEras } from "https://dotland.deno.dev/x/polkadot@0.2.38/api-derive/staking/util.ts"; filterEras<T extends { era: EraIndex; }>(eras: EraIndex[], list: T[]): EraIndex[]Type ParametersT extends { era: EraIndex; }Parameterseras: EraIndex[]list: T[]ReturnsEraIndex[]