function util.isErrorimport { util } from "https://dotland.deno.dev/x/polkadot@0.2.23/mod.ts"; const { isError } = util; isError(value: unknown): value is ErrorExamples import { isError } from 'https://deno.land/x/polkadot@0.2.23/util/mod.ts'; console.log('isError', isError(new Error('message'))); // => true Parametersvalue: unknownReturnsvalue is Error