Create 1-of-1 multisig when cosigner private keys are known

multisig-test.ts

import {
    Account,
    AggregateTransaction,
    Deadline,
    MultisigAccountModificationTransaction,
    NetworkType,
    RepositoryFactoryHttp,
    UInt64,
} from 'symbol-sdk';

/* start block 01 */
// replace with network type
const networkType = NetworkType.TEST_NET;
// replace with candidate multisig private key
const multisigPrivateKey = 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF';
const multisigAccount = Account.createFromPrivateKey(multisigPrivateKey, networkType);
// replace with cosignatory 1 public key
const cosignatory1PrivateKey = 'E59EF184A612D4C3C4D89B5950EB57262C69862B2F96E59C5043BF41765C482F';
const cosignatory1Account = Account.createFromPrivateKey(cosignatory1PrivateKey, networkType);
/* end block 01 */

/* start block 02 */
const multisigAccountModificationTransaction = MultisigAccountModificationTransaction.create(
    Deadline.create(),
    1,
    1,
    [cosignatory1Account.publicAccount],
    [],
    networkType);
/* end block 02 */

/* start block 03 */
const aggregateTransaction = AggregateTransaction.createComplete(
    Deadline.create(),
    [multisigAccountModificationTransaction.toAggregate(multisigAccount.publicAccount)],
    networkType,
    [],
    UInt64.fromUint(2000000));
/* end block 03 */

/* start block 04 */
// replace with meta.generationHash (nodeUrl + '/block/1')
const networkGenerationHash = '44D2225B8932C9A96DCB13508CBCDFFA9A9663BFBA2354FEEC8FCFCB7E19846C';
const signedTransaction = multisigAccount.signTransactionWithCosignatories(aggregateTransaction, [cosignatory1Account], networkGenerationHash);
console.log(signedTransaction.hash);
/* end block 04 */

/* start block 05 */
// replace with node endpoint
const nodeUrl = 'http://api-01.us-west-1.symboldev.network:3000';
const repositoryFactory = new RepositoryFactoryHttp(nodeUrl);
const transactionHttp = repositoryFactory.createTransactionRepository();

transactionHttp
    .announce(signedTransaction)
    .subscribe(
    (x) => console.log(x),
    (err) => console.log(err));
/* end block 05 */