Cosmos Blockchain: get keypair from privatekey

Question

I need to get the keypair from privatekey on Cosmos blockchain.

I have this code to get the keypair from mnemonic phrse:

const cosmos = require('cosmos-lib');

const keys = cosmos.crypto.getKeysFromMnemonic(MNEMONIC);

console.log(keys.publicKey, keys.privateKey);

But I need a new one yo get the keypair from PrivateKey.

Thanks