import { isBn } from "https://deno.land/x/polkadot@0.2.11/util/mod.ts";
Examples
import BN from 'https://esm.sh/bn.js@5.2.1';
import { isBn } from 'https://deno.land/x/polkadot@0.2.11/util/mod.ts';
console.log('isBn', isBn(new BN(1))); // => true