import { utilCrypto } from "https://deno.land/x/polkadot@0.2.45/mod.ts";
const { mnemonicValidate } = utilCrypto;
Examples
import { mnemonicGenerate, mnemonicValidate } from 'https://deno.land/x/polkadot@0.2.45/util-crypto/mod.ts';
const mnemonic = mnemonicGenerate(); // => string
const isValidMnemonic = mnemonicValidate(mnemonic); // => boolean