How to use the @stablelib/chacha20poly1305.ChaCha20Poly1305 function in @stablelib/chacha20poly1305

function encryptDerivationPath(derivationPath, hdPassphrase) {
    const serializedDerivationPath = cbor.encode(
        new CborIndefiniteLengthArray(derivationPath)
    )

    const cipher = new chacha20.ChaCha20Poly1305(hdPassphrase)

    return Buffer.from(
        cipher.seal(Buffer.from('serokellfore'), serializedDerivationPath)
    )
}

exports.encryptDerivationPath = function(derivationPath, hdPassphrase) {
  const serializedDerivationPath = cbor.encode(new CBORIndefiniteLengthArray(derivationPath))

  const cipher = new chacha20.ChaCha20Poly1305(hdPassphrase)

  return new Buffer(cipher.seal(new Buffer('serokellfore'), serializedDerivationPath))
}

function decryptDerivationPathOrFail(addressPayload, hdPassphrase) {
  const cipher = new chacha20.ChaCha20Poly1305(hdPassphrase)
  const decipheredDerivationPath = cipher.open(new Buffer('serokellfore'), addressPayload)

  try {
    return cbor.decode(new Buffer(decipheredDerivationPath))
  } catch (err) {
    throw new AddressDecodingException('incorrect address or passphrase')
  }
}