How to use the @0x/contracts-erc20.artifacts.DummyERC20Token function in @0x/contracts-erc20

public async deployDummyTokensAsync(
        numberToDeploy: number,
        decimals: BigNumber,
    ): Promise {
        for (let i = 0; i < numberToDeploy; i++) {
            this._dummyTokenContracts.push(
                await DummyERC20TokenContract.deployFrom0xArtifactAsync(
                    erc20Artifacts.DummyERC20Token,
                    this._provider,
                    txDefaults,
                    artifacts,
                    constants.DUMMY_TOKEN_NAME,
                    constants.DUMMY_TOKEN_SYMBOL,
                    decimals,
                    constants.DUMMY_TOKEN_TOTAL_SUPPLY,
                ),
            );
        }
        return this._dummyTokenContracts;
    }
    public async deployProxyAsync(): Promise {