How to use the 0x.js.ContractWrappers function in 0x

export async function scenarioAsync(): Promise {
    PrintUtils.printScenario('Exchange Subscribe');
    await runMigrationsOnceIfRequiredAsync();
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // No filter, get all of the Fill Events
    const filterValues: IndexedFilterValues = {};
    // Subscribe to the Fill Events on the Exchange
    contractWrappers.exchange.subscribe(
        ExchangeEvents.Fill,
        filterValues,
        (err: null | Error, decodedLogEvent?: DecodedLogEvent) => {
            if (err) {
                console.log('error:', err);
                providerEngine.stop();
            } else if (decodedLogEvent) {
                const fillLog = decodedLogEvent.log;
                const makerAssetData = assetDataUtils.decodeERC20AssetData(fillLog.args.makerAssetData);
                const takerAssetData = assetDataUtils.decodeERC20AssetData(fillLog.args.takerAssetData);
                PrintUtils.printData('Fill Event', [
                    ['orderHash', fillLog.args.orderHash],

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Fill Order ERC721');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    const etherTokenAddress = contractAddresses.etherToken;
    const dummyERC721TokenContract = dummyERC721TokenContracts[0];
    if (!dummyERC721TokenContract) {
        console.log('No Dummy ERC721 Tokens deployed on this network');
        return;
    }
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker] = await web3Wrapper.getAvailableAddressesAsync();

    const printUtils = new PrintUtils(web3Wrapper, contractWrappers, { maker, taker }, { WETH: etherTokenAddress });
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset (1 ERC721 Token)
    const makerAssetAmount = new BigNumber(1);

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Fill Order Standard Relayer API');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker] = await web3Wrapper.getAvailableAddressesAsync();
    const zrxTokenAddress = contractAddresses.zrxToken;
    const etherTokenAddress = contractAddresses.etherToken;
    const printUtils = new PrintUtils(
        web3Wrapper,
        contractWrappers,
        { maker, taker },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    const makerAssetData = assetDataUtils.encodeERC20AssetData(zrxTokenAddress);
    const takerAssetData = assetDataUtils.encodeERC20AssetData(etherTokenAddress);

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Execute Transaction fillOrder');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker, sender] = await web3Wrapper.getAvailableAddressesAsync();
    const feeRecipientAddress = sender;
    const zrxTokenAddress = contractAddresses.zrxToken;
    const etherTokenAddress = contractAddresses.etherToken;
    const printUtils = new PrintUtils(
        web3Wrapper,
        contractWrappers,
        { maker, taker, sender },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Forwarder Buy Tokens');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker] = await web3Wrapper.getAvailableAddressesAsync();
    const zrxTokenAddress = contractAddresses.zrxToken;
    const etherTokenAddress = contractAddresses.etherToken;
    const printUtils = new PrintUtils(
        web3Wrapper,
        contractWrappers,
        { maker, taker },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset
    const makerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(5), DECIMALS);

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Fill Order');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker] = await web3Wrapper.getAvailableAddressesAsync();
    const zrxTokenAddress = contractAddresses.zrxToken;
    const etherTokenAddress = contractAddresses.etherToken;
    const printUtils = new PrintUtils(
        web3Wrapper,
        contractWrappers,
        { maker, taker },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset
    const makerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(5), DECIMALS);

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Cancel Orders Up To');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker] = await web3Wrapper.getAvailableAddressesAsync();
    const zrxTokenAddress = contractAddresses.zrxToken;
    const etherTokenAddress = contractAddresses.etherToken;
    const printUtils = new PrintUtils(
        web3Wrapper,
        contractWrappers,
        { maker, taker },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset
    const makerAssetAmount = new BigNumber(100);

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Fill Order with Fees');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [maker, taker, feeRecipient] = await web3Wrapper.getAvailableAddressesAsync();
    const zrxTokenAddress = contractAddresses.zrxToken;
    const etherTokenAddress = contractAddresses.etherToken;
    const printUtils = new PrintUtils(
        web3Wrapper,
        contractWrappers,
        { maker, taker, feeRecipient },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    // the amount the maker is selling in maker asset
    const makerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(5), DECIMALS);

export async function scenarioAsync(): Promise {
    await runMigrationsOnceIfRequiredAsync();
    PrintUtils.printScenario('Match Orders');
    // Initialize the ContractWrappers, this provides helper functions around calling
    // 0x contracts as well as ERC20/ERC721 token contracts on the blockchain
    const contractWrappers = new ContractWrappers(providerEngine, { networkId: NETWORK_CONFIGS.networkId });
    // Initialize the Web3Wrapper, this provides helper functions around fetching
    // account information, balances, general contract logs
    const web3Wrapper = new Web3Wrapper(providerEngine);
    const [leftMaker, rightMaker, matcherAccount] = await web3Wrapper.getAvailableAddressesAsync();
    const zrxTokenAddress = contractAddresses.zrxToken;
    const etherTokenAddress = contractAddresses.etherToken;
    const printUtils = new PrintUtils(
        web3Wrapper,
        contractWrappers,
        { leftMaker, rightMaker, matcherAccount },
        { WETH: etherTokenAddress, ZRX: zrxTokenAddress },
    );
    printUtils.printAccounts();

    // the amount the maker is selling of maker asset
    const makerAssetAmount = Web3Wrapper.toBaseUnitAmount(new BigNumber(10), DECIMALS);