How to use the @aws-crypto/client-node.limitRegions function in @aws-crypto/client-node

export async function kmsRegionalDiscoveryLimitTest (ciphertext: string|Buffer) {
  const discovery = true
  // This provider will *only* decrypt for keys in the us-east-1 region.
  const clientProvider = limitRegions(['us-east-1'], getKmsClient)
  const keyring = new KmsKeyringNode({ clientProvider, discovery })

  const cleartext = await decrypt(keyring, ciphertext)

  return { ciphertext, cleartext }
}