Update file structure

28 files changed, 0 insertions, 3371 deletions

diff --git a/packages/contracts/src/utils/address_utils.ts b/packages/contracts/src/utils/address_utils.ts
deleted file mode 100644
index a9fb6921a..000000000
--- a/packages/contracts/src/utils/address_utils.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { crypto, generatePseudoRandomSalt } from '@0xproject/order-utils';
-
-export const addressUtils = {
-    generatePseudoRandomAddress(): string {
-        const randomBigNum = generatePseudoRandomSalt();
-        const randomBuff = crypto.solSHA3([randomBigNum]);
-        const randomAddress = `0x${randomBuff.slice(0, 20).toString('hex')}`;
-        return randomAddress;
-    },
-};
diff --git a/packages/contracts/src/utils/artifacts.ts b/packages/contracts/src/utils/artifacts.ts
deleted file mode 100644
index b25266409..000000000
--- a/packages/contracts/src/utils/artifacts.ts
+++ /dev/null
@@ -1,51 +0,0 @@
-import { ContractArtifact } from '@0xproject/sol-compiler';
-
-import * as AssetProxyOwner from '../artifacts/AssetProxyOwner.json';
-import * as DummyERC20Token from '../artifacts/DummyERC20Token.json';
-import * as DummyERC721Receiver from '../artifacts/DummyERC721Receiver.json';
-import * as DummyERC721Token from '../artifacts/DummyERC721Token.json';
-import * as ERC20Proxy from '../artifacts/ERC20Proxy.json';
-import * as ERC721Proxy from '../artifacts/ERC721Proxy.json';
-import * as Exchange from '../artifacts/Exchange.json';
-import * as ExchangeWrapper from '../artifacts/ExchangeWrapper.json';
-import * as IAssetProxy from '../artifacts/IAssetProxy.json';
-import * as MixinAuthorizable from '../artifacts/MixinAuthorizable.json';
-import * as MultiSigWallet from '../artifacts/MultiSigWallet.json';
-import * as MultiSigWalletWithTimeLock from '../artifacts/MultiSigWalletWithTimeLock.json';
-import * as TestAssetProxyDispatcher from '../artifacts/TestAssetProxyDispatcher.json';
-import * as TestAssetProxyOwner from '../artifacts/TestAssetProxyOwner.json';
-import * as TestLibBytes from '../artifacts/TestLibBytes.json';
-import * as TestLibs from '../artifacts/TestLibs.json';
-import * as TestSignatureValidator from '../artifacts/TestSignatureValidator.json';
-import * as TestValidator from '../artifacts/TestValidator.json';
-import * as TestWallet from '../artifacts/TestWallet.json';
-import * as TokenRegistry from '../artifacts/TokenRegistry.json';
-import * as EtherToken from '../artifacts/WETH9.json';
-import * as Whitelist from '../artifacts/Whitelist.json';
-import * as ZRX from '../artifacts/ZRXToken.json';
-
-export const artifacts = {
-    AssetProxyOwner: (AssetProxyOwner as any) as ContractArtifact,
-    DummyERC20Token: (DummyERC20Token as any) as ContractArtifact,
-    DummyERC721Receiver: (DummyERC721Receiver as any) as ContractArtifact,
-    DummyERC721Token: (DummyERC721Token as any) as ContractArtifact,
-    ERC20Proxy: (ERC20Proxy as any) as ContractArtifact,
-    ERC721Proxy: (ERC721Proxy as any) as ContractArtifact,
-    Exchange: (Exchange as any) as ContractArtifact,
-    ExchangeWrapper: (ExchangeWrapper as any) as ContractArtifact,
-    EtherToken: (EtherToken as any) as ContractArtifact,
-    IAssetProxy: (IAssetProxy as any) as ContractArtifact,
-    MixinAuthorizable: (MixinAuthorizable as any) as ContractArtifact,
-    MultiSigWallet: (MultiSigWallet as any) as ContractArtifact,
-    MultiSigWalletWithTimeLock: (MultiSigWalletWithTimeLock as any) as ContractArtifact,
-    TestAssetProxyOwner: (TestAssetProxyOwner as any) as ContractArtifact,
-    TestAssetProxyDispatcher: (TestAssetProxyDispatcher as any) as ContractArtifact,
-    TestLibBytes: (TestLibBytes as any) as ContractArtifact,
-    TestLibs: (TestLibs as any) as ContractArtifact,
-    TestSignatureValidator: (TestSignatureValidator as any) as ContractArtifact,
-    TestValidator: (TestValidator as any) as ContractArtifact,
-    TestWallet: (TestWallet as any) as ContractArtifact,
-    TokenRegistry: (TokenRegistry as any) as ContractArtifact,
-    Whitelist: (Whitelist as any) as ContractArtifact,
-    ZRX: (ZRX as any) as ContractArtifact,
-};
diff --git a/packages/contracts/src/utils/assertions.ts b/packages/contracts/src/utils/assertions.ts
deleted file mode 100644
index baba892d3..000000000
--- a/packages/contracts/src/utils/assertions.ts
+++ /dev/null
@@ -1,108 +0,0 @@
-import { RevertReason } from '@0xproject/types';
-import * as chai from 'chai';
-import { TransactionReceipt, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { constants } from './constants';
-import { web3Wrapper } from './web3_wrapper';
-
-const expect = chai.expect;
-
-function _expectEitherErrorAsync<T>(p: Promise<T>, error1: string, error2: string): PromiseLike<void> {
-    return expect(p)
-        .to.be.rejected()
-        .then(e => {
-            expect(e).to.satisfy(
-                (err: Error) => _.includes(err.message, error1) || _.includes(err.message, error2),
-                `expected promise to reject with error message that includes "${error1}" or "${error2}", but got: ` +
-                    `"${e.message}"\n`,
-            );
-        });
-}
-
-/**
- * Rejects if the given Promise does not reject with an error indicating
- * insufficient funds.
- * @param p the Promise which is expected to reject
- * @returns a new Promise which will reject if the conditions are not met and
- * otherwise resolve with no value.
- */
-export function expectInsufficientFundsAsync<T>(p: Promise<T>): PromiseLike<void> {
-    return _expectEitherErrorAsync(p, 'insufficient funds', "sender doesn't have enough funds");
-}
-
-/**
- * Rejects if the given Promise does not reject with a "revert" error or the
- * given otherError.
- * @param p the Promise which is expected to reject
- * @param otherError the other error which is accepted as a valid reject error.
- * @returns a new Promise which will reject if the conditions are not met and
- * otherwise resolve with no value.
- */
-export function expectRevertOrOtherErrorAsync<T>(p: Promise<T>, otherError: string): PromiseLike<void> {
-    return _expectEitherErrorAsync(p, constants.REVERT, otherError);
-}
-
-/**
- * Rejects if the given Promise does not reject with a "revert" or "always
- * failing transaction" error.
- * @param p the Promise which is expected to reject
- * @returns a new Promise which will reject if the conditions are not met and
- * otherwise resolve with no value.
- */
-export function expectRevertOrAlwaysFailingTransactionAsync<T>(p: Promise<T>): PromiseLike<void> {
-    return expectRevertOrOtherErrorAsync(p, 'always failing transaction');
-}
-
-/**
- * Rejects if at least one the following conditions is not met:
- * 1) The given Promise rejects with the given revert reason.
- * 2) The given Promise rejects with an error containing "always failing transaction"
- * 3) The given Promise fulfills with a txReceipt that has a status of 0 or '0', indicating the transaction failed.
- * 4) The given Promise fulfills with a txHash and corresponding txReceipt has a status of 0 or '0'.
- * @param p the Promise which is expected to reject
- * @param reason a specific revert reason
- * @returns a new Promise which will reject if the conditions are not met and
- * otherwise resolve with no value.
- */
-export async function expectRevertReasonOrAlwaysFailingTransactionAsync(
-    p: Promise<string | TransactionReceiptWithDecodedLogs | TransactionReceipt>,
-    reason: RevertReason,
-): Promise<void> {
-    return p
-        .then(async result => {
-            let txReceiptStatus: string | 0 | 1 | null;
-            if (typeof result === 'string') {
-                // Result is a txHash. We need to make a web3 call to get the receipt.
-                const txReceipt = await web3Wrapper.awaitTransactionMinedAsync(result);
-                txReceiptStatus = txReceipt.status;
-            } else if ('status' in result) {
-                // Result is a TransactionReceiptWithDecodedLogs or TransactionReceipt
-                // and status is a field of result.
-                txReceiptStatus = result.status;
-            } else {
-                throw new Error('Unexpected result type');
-            }
-            expect(_.toString(txReceiptStatus)).to.equal(
-                '0',
-                'transactionReceipt had a non-zero status, indicating success',
-            );
-        })
-        .catch(err => {
-            expect(err.message).to.satisfy(
-                (msg: string) => _.includes(msg, reason) || _.includes(msg, 'always failing transaction'),
-                `Expected ${reason} or 'always failing transaction' but error message was ${err.message}`,
-            );
-        });
-}
-
-/**
- * Rejects if the given Promise does not reject with a "revert" or "Contract
- * call failed" error.
- * @param p the Promise which is expected to reject
- * @returns a new Promise which will reject if the conditions are not met and
- * otherwise resolve with no value.
- */
-export function expectRevertOrContractCallFailedAsync<T>(p: Promise<T>): PromiseLike<void> {
-    return expectRevertOrOtherErrorAsync<T>(p, 'Contract call failed');
-}
diff --git a/packages/contracts/src/utils/asset_wrapper.ts b/packages/contracts/src/utils/asset_wrapper.ts
deleted file mode 100644
index a7f91f413..000000000
--- a/packages/contracts/src/utils/asset_wrapper.ts
+++ /dev/null
@@ -1,217 +0,0 @@
-import { assetProxyUtils } from '@0xproject/order-utils';
-import { AssetProxyId } from '@0xproject/types';
-import { BigNumber, errorUtils } from '@0xproject/utils';
-import * as _ from 'lodash';
-
-import { AbstractAssetWrapper } from '../abstract/abstract_asset_wrapper';
-
-import { constants } from './constants';
-import { ERC20Wrapper } from './erc20_wrapper';
-import { ERC721Wrapper } from './erc721_wrapper';
-
-interface ProxyIdToAssetWrappers {
-    [proxyId: string]: AbstractAssetWrapper;
-}
-
-/**
- * This class abstracts away the differences between ERC20 and ERC721 tokens so that
- * the logic that uses it does not need to care what standard a token belongs to.
- */
-export class AssetWrapper {
-    private _proxyIdToAssetWrappers: ProxyIdToAssetWrappers;
-    constructor(assetWrappers: AbstractAssetWrapper[]) {
-        this._proxyIdToAssetWrappers = {};
-        _.each(assetWrappers, assetWrapper => {
-            const proxyId = assetWrapper.getProxyId();
-            this._proxyIdToAssetWrappers[proxyId] = assetWrapper;
-        });
-    }
-    public async getBalanceAsync(userAddress: string, assetData: string): Promise<BigNumber> {
-        const proxyId = assetProxyUtils.decodeAssetDataId(assetData);
-        switch (proxyId) {
-            case AssetProxyId.ERC20: {
-                const erc20Wrapper = this._proxyIdToAssetWrappers[proxyId] as ERC20Wrapper;
-                const balance = await erc20Wrapper.getBalanceAsync(userAddress, assetData);
-                return balance;
-            }
-            case AssetProxyId.ERC721: {
-                const assetWrapper = this._proxyIdToAssetWrappers[proxyId] as ERC721Wrapper;
-                const assetProxyData = assetProxyUtils.decodeERC721AssetData(assetData);
-                const isOwner = await assetWrapper.isOwnerAsync(
-                    userAddress,
-                    assetProxyData.tokenAddress,
-                    assetProxyData.tokenId,
-                );
-                const balance = isOwner ? new BigNumber(1) : new BigNumber(0);
-                return balance;
-            }
-            default:
-                throw errorUtils.spawnSwitchErr('proxyId', proxyId);
-        }
-    }
-    public async setBalanceAsync(userAddress: string, assetData: string, desiredBalance: BigNumber): Promise<void> {
-        const proxyId = assetProxyUtils.decodeAssetDataId(assetData);
-        switch (proxyId) {
-            case AssetProxyId.ERC20: {
-                const erc20Wrapper = this._proxyIdToAssetWrappers[proxyId] as ERC20Wrapper;
-                await erc20Wrapper.setBalanceAsync(userAddress, assetData, desiredBalance);
-                return;
-            }
-            case AssetProxyId.ERC721: {
-                if (!desiredBalance.eq(0) && !desiredBalance.eq(1)) {
-                    throw new Error(`Balance for ERC721 token can only be set to 0 or 1. Got: ${desiredBalance}`);
-                }
-                const erc721Wrapper = this._proxyIdToAssetWrappers[proxyId] as ERC721Wrapper;
-                const assetProxyData = assetProxyUtils.decodeERC721AssetData(assetData);
-                const doesTokenExist = erc721Wrapper.doesTokenExistAsync(
-                    assetProxyData.tokenAddress,
-                    assetProxyData.tokenId,
-                );
-                if (!doesTokenExist && desiredBalance.eq(1)) {
-                    await erc721Wrapper.mintAsync(assetProxyData.tokenAddress, assetProxyData.tokenId, userAddress);
-                    return;
-                } else if (!doesTokenExist && desiredBalance.eq(0)) {
-                    return; // noop
-                }
-                const tokenOwner = await erc721Wrapper.ownerOfAsync(
-                    assetProxyData.tokenAddress,
-                    assetProxyData.tokenId,
-                );
-                if (userAddress !== tokenOwner && desiredBalance.eq(1)) {
-                    await erc721Wrapper.transferFromAsync(
-                        assetProxyData.tokenAddress,
-                        assetProxyData.tokenId,
-                        tokenOwner,
-                        userAddress,
-                    );
-                } else if (tokenOwner === userAddress && desiredBalance.eq(0)) {
-                    // Burn token
-                    await erc721Wrapper.burnAsync(assetProxyData.tokenAddress, assetProxyData.tokenId, userAddress);
-                    return;
-                } else if (
-                    (userAddress !== tokenOwner && desiredBalance.eq(0)) ||
-                    (tokenOwner === userAddress && desiredBalance.eq(1))
-                ) {
-                    return; // noop
-                }
-                break;
-            }
-            default:
-                throw errorUtils.spawnSwitchErr('proxyId', proxyId);
-        }
-    }
-    public async getProxyAllowanceAsync(userAddress: string, assetData: string): Promise<BigNumber> {
-        const proxyId = assetProxyUtils.decodeAssetDataId(assetData);
-        switch (proxyId) {
-            case AssetProxyId.ERC20: {
-                const erc20Wrapper = this._proxyIdToAssetWrappers[proxyId] as ERC20Wrapper;
-                const allowance = await erc20Wrapper.getProxyAllowanceAsync(userAddress, assetData);
-                return allowance;
-            }
-            case AssetProxyId.ERC721: {
-                const assetWrapper = this._proxyIdToAssetWrappers[proxyId] as ERC721Wrapper;
-                const erc721ProxyData = assetProxyUtils.decodeERC721AssetData(assetData);
-                const isProxyApprovedForAll = await assetWrapper.isProxyApprovedForAllAsync(
-                    userAddress,
-                    erc721ProxyData.tokenAddress,
-                );
-                if (isProxyApprovedForAll) {
-                    return constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
-                }
-
-                const isProxyApproved = await assetWrapper.isProxyApprovedAsync(
-                    erc721ProxyData.tokenAddress,
-                    erc721ProxyData.tokenId,
-                );
-                const allowance = isProxyApproved ? new BigNumber(1) : new BigNumber(0);
-                return allowance;
-            }
-            default:
-                throw errorUtils.spawnSwitchErr('proxyId', proxyId);
-        }
-    }
-    public async setProxyAllowanceAsync(
-        userAddress: string,
-        assetData: string,
-        desiredAllowance: BigNumber,
-    ): Promise<void> {
-        const proxyId = assetProxyUtils.decodeAssetDataId(assetData);
-        switch (proxyId) {
-            case AssetProxyId.ERC20: {
-                const erc20Wrapper = this._proxyIdToAssetWrappers[proxyId] as ERC20Wrapper;
-                await erc20Wrapper.setAllowanceAsync(userAddress, assetData, desiredAllowance);
-                return;
-            }
-            case AssetProxyId.ERC721: {
-                if (
-                    !desiredAllowance.eq(0) &&
-                    !desiredAllowance.eq(1) &&
-                    !desiredAllowance.eq(constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS)
-                ) {
-                    throw new Error(
-                        `Allowance for ERC721 token can only be set to 0, 1 or 2^256-1. Got: ${desiredAllowance}`,
-                    );
-                }
-                const erc721Wrapper = this._proxyIdToAssetWrappers[proxyId] as ERC721Wrapper;
-                const assetProxyData = assetProxyUtils.decodeERC721AssetData(assetData);
-
-                const doesTokenExist = await erc721Wrapper.doesTokenExistAsync(
-                    assetProxyData.tokenAddress,
-                    assetProxyData.tokenId,
-                );
-                if (!doesTokenExist) {
-                    throw new Error(
-                        `Cannot setProxyAllowance on non-existent token: ${assetProxyData.tokenAddress} ${
-                            assetProxyData.tokenId
-                        }`,
-                    );
-                }
-                const isProxyApprovedForAll = await erc721Wrapper.isProxyApprovedForAllAsync(
-                    userAddress,
-                    assetProxyData.tokenAddress,
-                );
-                if (!isProxyApprovedForAll && desiredAllowance.eq(constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS)) {
-                    const isApproved = true;
-                    await erc721Wrapper.approveProxyForAllAsync(
-                        assetProxyData.tokenAddress,
-                        assetProxyData.tokenId,
-                        isApproved,
-                    );
-                } else if (isProxyApprovedForAll && desiredAllowance.eq(0)) {
-                    const isApproved = false;
-                    await erc721Wrapper.approveProxyForAllAsync(
-                        assetProxyData.tokenAddress,
-                        assetProxyData.tokenId,
-                        isApproved,
-                    );
-                } else if (isProxyApprovedForAll && desiredAllowance.eq(constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS)) {
-                    return; // Noop
-                }
-
-                const isProxyApproved = await erc721Wrapper.isProxyApprovedAsync(
-                    assetProxyData.tokenAddress,
-                    assetProxyData.tokenId,
-                );
-                if (!isProxyApproved && desiredAllowance.eq(1)) {
-                    await erc721Wrapper.approveProxyAsync(assetProxyData.tokenAddress, assetProxyData.tokenId);
-                } else if (isProxyApproved && desiredAllowance.eq(0)) {
-                    // Remove approval
-                    await erc721Wrapper.approveAsync(
-                        constants.NULL_ADDRESS,
-                        assetProxyData.tokenAddress,
-                        assetProxyData.tokenId,
-                    );
-                } else if (
-                    (!isProxyApproved && desiredAllowance.eq(0)) ||
-                    (isProxyApproved && desiredAllowance.eq(1))
-                ) {
-                    return; // noop
-                }
-
-                break;
-            }
-            default:
-                throw errorUtils.spawnSwitchErr('proxyId', proxyId);
-        }
-    }
-}
diff --git a/packages/contracts/src/utils/chai_setup.ts b/packages/contracts/src/utils/chai_setup.ts
deleted file mode 100644
index 1a8733093..000000000
--- a/packages/contracts/src/utils/chai_setup.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import * as chai from 'chai';
-import chaiAsPromised = require('chai-as-promised');
-import ChaiBigNumber = require('chai-bignumber');
-import * as dirtyChai from 'dirty-chai';
-
-export const chaiSetup = {
-    configure(): void {
-        chai.config.includeStack = true;
-        chai.use(ChaiBigNumber());
-        chai.use(dirtyChai);
-        chai.use(chaiAsPromised);
-    },
-};
diff --git a/packages/contracts/src/utils/constants.ts b/packages/contracts/src/utils/constants.ts
deleted file mode 100644
index 8e68f376d..000000000
--- a/packages/contracts/src/utils/constants.ts
+++ /dev/null
@@ -1,50 +0,0 @@
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as ethUtil from 'ethereumjs-util';
-import * as _ from 'lodash';
-
-const TESTRPC_PRIVATE_KEYS_STRINGS = [
-    '0xf2f48ee19680706196e2e339e5da3491186e0c4c5030670656b0e0164837257d',
-    '0x5d862464fe9303452126c8bc94274b8c5f9874cbd219789b3eb2128075a76f72',
-    '0xdf02719c4df8b9b8ac7f551fcb5d9ef48fa27eef7a66453879f4d8fdc6e78fb1',
-    '0xff12e391b79415e941a94de3bf3a9aee577aed0731e297d5cfa0b8a1e02fa1d0',
-    '0x752dd9cf65e68cfaba7d60225cbdbc1f4729dd5e5507def72815ed0d8abc6249',
-    '0xefb595a0178eb79a8df953f87c5148402a224cdf725e88c0146727c6aceadccd',
-    '0x83c6d2cc5ddcf9711a6d59b417dc20eb48afd58d45290099e5987e3d768f328f',
-    '0xbb2d3f7c9583780a7d3904a2f55d792707c345f21de1bacb2d389934d82796b2',
-    '0xb2fd4d29c1390b71b8795ae81196bfd60293adf99f9d32a0aff06288fcdac55f',
-    '0x23cb7121166b9a2f93ae0b7c05bde02eae50d64449b2cbb42bc84e9d38d6cc89',
-];
-
-export const constants = {
-    INVALID_OPCODE: 'invalid opcode',
-    REVERT: 'revert',
-    TESTRPC_NETWORK_ID: 50,
-    // Note(albrow): In practice V8 and most other engines limit the minimum
-    // interval for setInterval to 10ms. We still set it to 0 here in order to
-    // ensure we always use the minimum interval.
-    AWAIT_TRANSACTION_MINED_MS: 0,
-    MAX_ETHERTOKEN_WITHDRAW_GAS: 43000,
-    MAX_TOKEN_TRANSFERFROM_GAS: 80000,
-    MAX_TOKEN_APPROVE_GAS: 60000,
-    TRANSFER_FROM_GAS: 150000,
-    DUMMY_TOKEN_NAME: '',
-    DUMMY_TOKEN_SYMBOL: '',
-    DUMMY_TOKEN_DECIMALS: new BigNumber(18),
-    DUMMY_TOKEN_TOTAL_SUPPLY: new BigNumber(0),
-    NULL_BYTES: '0x',
-    NUM_DUMMY_ERC20_TO_DEPLOY: 3,
-    NUM_DUMMY_ERC721_TO_DEPLOY: 1,
-    NUM_ERC721_TOKENS_TO_MINT: 2,
-    NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
-    UNLIMITED_ALLOWANCE_IN_BASE_UNITS: new BigNumber(2).pow(256).minus(1),
-    TESTRPC_PRIVATE_KEYS: _.map(TESTRPC_PRIVATE_KEYS_STRINGS, privateKeyString => ethUtil.toBuffer(privateKeyString)),
-    INITIAL_ERC20_BALANCE: Web3Wrapper.toBaseUnitAmount(new BigNumber(10000), 18),
-    INITIAL_ERC20_ALLOWANCE: Web3Wrapper.toBaseUnitAmount(new BigNumber(10000), 18),
-    STATIC_ORDER_PARAMS: {
-        makerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(100), 18),
-        takerAssetAmount: Web3Wrapper.toBaseUnitAmount(new BigNumber(200), 18),
-        makerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
-        takerFee: Web3Wrapper.toBaseUnitAmount(new BigNumber(1), 18),
-    },
-};
diff --git a/packages/contracts/src/utils/core_combinatorial_utils.ts b/packages/contracts/src/utils/core_combinatorial_utils.ts
deleted file mode 100644
index 93f4fc79d..000000000
--- a/packages/contracts/src/utils/core_combinatorial_utils.ts
+++ /dev/null
@@ -1,801 +0,0 @@
-import {
-    assetProxyUtils,
-    BalanceAndProxyAllowanceLazyStore,
-    ExchangeTransferSimulator,
-    orderHashUtils,
-    OrderStateUtils,
-    OrderValidationUtils,
-} from '@0xproject/order-utils';
-import { AssetProxyId, RevertReason, SignatureType, SignedOrder } from '@0xproject/types';
-import { BigNumber, errorUtils, logUtils } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as chai from 'chai';
-import { LogWithDecodedArgs, Provider, TxData } from 'ethereum-types';
-import * as _ from 'lodash';
-import 'make-promises-safe';
-
-import { ExchangeContract, FillContractEventArgs } from '../generated_contract_wrappers/exchange';
-import { artifacts } from '../utils/artifacts';
-import { expectRevertReasonOrAlwaysFailingTransactionAsync } from '../utils/assertions';
-import { AssetWrapper } from '../utils/asset_wrapper';
-import { chaiSetup } from '../utils/chai_setup';
-import { constants } from '../utils/constants';
-import { ERC20Wrapper } from '../utils/erc20_wrapper';
-import { ERC721Wrapper } from '../utils/erc721_wrapper';
-import { ExchangeWrapper } from '../utils/exchange_wrapper';
-import { OrderFactoryFromScenario } from '../utils/order_factory_from_scenario';
-import { orderUtils } from '../utils/order_utils';
-import { signingUtils } from '../utils/signing_utils';
-import { SimpleAssetBalanceAndProxyAllowanceFetcher } from '../utils/simple_asset_balance_and_proxy_allowance_fetcher';
-import { SimpleOrderFilledCancelledFetcher } from '../utils/simple_order_filled_cancelled_fetcher';
-import {
-    AllowanceAmountScenario,
-    AssetDataScenario,
-    BalanceAmountScenario,
-    ExpirationTimeSecondsScenario,
-    FeeRecipientAddressScenario,
-    FillScenario,
-    OrderAssetAmountScenario,
-    TakerAssetFillAmountScenario,
-    TakerScenario,
-    TraderStateScenario,
-} from '../utils/types';
-
-chaiSetup.configure();
-const expect = chai.expect;
-
-/**
- * Instantiates a new instance of CoreCombinatorialUtils. Since this method has some
- * required async setup, a factory method is required.
- * @param web3Wrapper Web3Wrapper instance
- * @param txDefaults Default Ethereum tx options
- * @return CoreCombinatorialUtils instance
- */
-export async function coreCombinatorialUtilsFactoryAsync(
-    web3Wrapper: Web3Wrapper,
-    txDefaults: Partial<TxData>,
-): Promise<CoreCombinatorialUtils> {
-    const accounts = await web3Wrapper.getAvailableAddressesAsync();
-    const userAddresses = _.slice(accounts, 0, 5);
-    const [ownerAddress, makerAddress, takerAddress] = userAddresses;
-    const makerPrivateKey = constants.TESTRPC_PRIVATE_KEYS[userAddresses.indexOf(makerAddress)];
-
-    const provider = web3Wrapper.getProvider();
-    const erc20Wrapper = new ERC20Wrapper(provider, userAddresses, ownerAddress);
-    const erc721Wrapper = new ERC721Wrapper(provider, userAddresses, ownerAddress);
-
-    const erc20EighteenDecimalTokenCount = 3;
-    const eighteenDecimals = new BigNumber(18);
-    const [
-        erc20EighteenDecimalTokenA,
-        erc20EighteenDecimalTokenB,
-        zrxToken,
-    ] = await erc20Wrapper.deployDummyTokensAsync(erc20EighteenDecimalTokenCount, eighteenDecimals);
-    const zrxAssetData = assetProxyUtils.encodeERC20AssetData(zrxToken.address);
-
-    const erc20FiveDecimalTokenCount = 2;
-    const fiveDecimals = new BigNumber(18);
-    const [erc20FiveDecimalTokenA, erc20FiveDecimalTokenB] = await erc20Wrapper.deployDummyTokensAsync(
-        erc20FiveDecimalTokenCount,
-        fiveDecimals,
-    );
-    const erc20Proxy = await erc20Wrapper.deployProxyAsync();
-    await erc20Wrapper.setBalancesAndAllowancesAsync();
-
-    const [erc721Token] = await erc721Wrapper.deployDummyTokensAsync();
-    const erc721Proxy = await erc721Wrapper.deployProxyAsync();
-    await erc721Wrapper.setBalancesAndAllowancesAsync();
-    const erc721Balances = await erc721Wrapper.getBalancesAsync();
-
-    const assetWrapper = new AssetWrapper([erc20Wrapper, erc721Wrapper]);
-
-    const exchangeContract = await ExchangeContract.deployFrom0xArtifactAsync(
-        artifacts.Exchange,
-        provider,
-        txDefaults,
-        zrxAssetData,
-    );
-    const exchangeWrapper = new ExchangeWrapper(exchangeContract, provider);
-    await exchangeWrapper.registerAssetProxyAsync(erc20Proxy.address, ownerAddress);
-    await exchangeWrapper.registerAssetProxyAsync(erc721Proxy.address, ownerAddress);
-
-    await web3Wrapper.awaitTransactionSuccessAsync(
-        await erc20Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeContract.address, {
-            from: ownerAddress,
-        }),
-        constants.AWAIT_TRANSACTION_MINED_MS,
-    );
-    await web3Wrapper.awaitTransactionSuccessAsync(
-        await erc721Proxy.addAuthorizedAddress.sendTransactionAsync(exchangeContract.address, {
-            from: ownerAddress,
-        }),
-        constants.AWAIT_TRANSACTION_MINED_MS,
-    );
-
-    const orderFactory = new OrderFactoryFromScenario(
-        userAddresses,
-        zrxToken.address,
-        [erc20EighteenDecimalTokenA.address, erc20EighteenDecimalTokenB.address],
-        [erc20FiveDecimalTokenA.address, erc20FiveDecimalTokenB.address],
-        erc721Token,
-        erc721Balances,
-        exchangeContract.address,
-    );
-
-    const coreCombinatorialUtils = new CoreCombinatorialUtils(
-        orderFactory,
-        ownerAddress,
-        makerAddress,
-        makerPrivateKey,
-        takerAddress,
-        zrxAssetData,
-        exchangeWrapper,
-        assetWrapper,
-    );
-    return coreCombinatorialUtils;
-}
-
-export class CoreCombinatorialUtils {
-    public orderFactory: OrderFactoryFromScenario;
-    public ownerAddress: string;
-    public makerAddress: string;
-    public makerPrivateKey: Buffer;
-    public takerAddress: string;
-    public zrxAssetData: string;
-    public exchangeWrapper: ExchangeWrapper;
-    public assetWrapper: AssetWrapper;
-    public static generateFillOrderCombinations(): FillScenario[] {
-        const takerScenarios = [TakerScenario.Unspecified];
-        const feeRecipientScenarios = [FeeRecipientAddressScenario.EthUserAddress];
-        const makerAssetAmountScenario = [OrderAssetAmountScenario.Large];
-        const takerAssetAmountScenario = [OrderAssetAmountScenario.Large];
-        const makerFeeScenario = [OrderAssetAmountScenario.Large];
-        const takerFeeScenario = [OrderAssetAmountScenario.Large];
-        const expirationTimeSecondsScenario = [ExpirationTimeSecondsScenario.InFuture];
-        const makerAssetDataScenario = [
-            AssetDataScenario.ERC20FiveDecimals,
-            AssetDataScenario.ERC20NonZRXEighteenDecimals,
-            AssetDataScenario.ERC721,
-            AssetDataScenario.ZRXFeeToken,
-        ];
-        const takerAssetDataScenario = [
-            AssetDataScenario.ERC20FiveDecimals,
-            AssetDataScenario.ERC20NonZRXEighteenDecimals,
-            AssetDataScenario.ERC721,
-            AssetDataScenario.ZRXFeeToken,
-        ];
-        const takerAssetFillAmountScenario = [TakerAssetFillAmountScenario.ExactlyRemainingFillableTakerAssetAmount];
-        const fillScenarioArrays = CoreCombinatorialUtils._getAllCombinations([
-            takerScenarios,
-            feeRecipientScenarios,
-            makerAssetAmountScenario,
-            takerAssetAmountScenario,
-            makerFeeScenario,
-            takerFeeScenario,
-            expirationTimeSecondsScenario,
-            makerAssetDataScenario,
-            takerAssetDataScenario,
-            takerAssetFillAmountScenario,
-        ]);
-
-        const fillScenarios = _.map(fillScenarioArrays, fillScenarioArray => {
-            const fillScenario: FillScenario = {
-                orderScenario: {
-                    takerScenario: fillScenarioArray[0] as TakerScenario,
-                    feeRecipientScenario: fillScenarioArray[1] as FeeRecipientAddressScenario,
-                    makerAssetAmountScenario: fillScenarioArray[2] as OrderAssetAmountScenario,
-                    takerAssetAmountScenario: fillScenarioArray[3] as OrderAssetAmountScenario,
-                    makerFeeScenario: fillScenarioArray[4] as OrderAssetAmountScenario,
-                    takerFeeScenario: fillScenarioArray[5] as OrderAssetAmountScenario,
-                    expirationTimeSecondsScenario: fillScenarioArray[6] as ExpirationTimeSecondsScenario,
-                    makerAssetDataScenario: fillScenarioArray[7] as AssetDataScenario,
-                    takerAssetDataScenario: fillScenarioArray[8] as AssetDataScenario,
-                },
-                takerAssetFillAmountScenario: fillScenarioArray[9] as TakerAssetFillAmountScenario,
-                makerStateScenario: {
-                    traderAssetBalance: BalanceAmountScenario.Higher,
-                    traderAssetAllowance: AllowanceAmountScenario.Higher,
-                    zrxFeeBalance: BalanceAmountScenario.Higher,
-                    zrxFeeAllowance: AllowanceAmountScenario.Higher,
-                },
-                takerStateScenario: {
-                    traderAssetBalance: BalanceAmountScenario.Higher,
-                    traderAssetAllowance: AllowanceAmountScenario.Higher,
-                    zrxFeeBalance: BalanceAmountScenario.Higher,
-                    zrxFeeAllowance: AllowanceAmountScenario.Higher,
-                },
-            };
-            return fillScenario;
-        });
-
-        return fillScenarios;
-    }
-    /**
-     * Recursive implementation of generating all combinations of the supplied
-     * string-containing arrays.
-     */
-    private static _getAllCombinations(arrays: string[][]): string[][] {
-        // Base case
-        if (arrays.length === 1) {
-            const remainingValues = _.map(arrays[0], val => {
-                return [val];
-            });
-            return remainingValues;
-        } else {
-            const result = [];
-            const restOfArrays = arrays.slice(1);
-            const allCombinationsOfRemaining = CoreCombinatorialUtils._getAllCombinations(restOfArrays); // recur with the rest of array
-            // tslint:disable:prefer-for-of
-            for (let i = 0; i < allCombinationsOfRemaining.length; i++) {
-                for (let j = 0; j < arrays[0].length; j++) {
-                    result.push([arrays[0][j], ...allCombinationsOfRemaining[i]]);
-                }
-            }
-            // tslint:enable:prefer-for-of
-            return result;
-        }
-    }
-    constructor(
-        orderFactory: OrderFactoryFromScenario,
-        ownerAddress: string,
-        makerAddress: string,
-        makerPrivateKey: Buffer,
-        takerAddress: string,
-        zrxAssetData: string,
-        exchangeWrapper: ExchangeWrapper,
-        assetWrapper: AssetWrapper,
-    ) {
-        this.orderFactory = orderFactory;
-        this.ownerAddress = ownerAddress;
-        this.makerAddress = makerAddress;
-        this.makerPrivateKey = makerPrivateKey;
-        this.takerAddress = takerAddress;
-        this.zrxAssetData = zrxAssetData;
-        this.exchangeWrapper = exchangeWrapper;
-        this.assetWrapper = assetWrapper;
-    }
-    public async testFillOrderScenarioAsync(
-        provider: Provider,
-        fillScenario: FillScenario,
-        isVerbose: boolean = false,
-    ): Promise<void> {
-        // 1. Generate order
-        const order = this.orderFactory.generateOrder(fillScenario.orderScenario);
-
-        // 2. Sign order
-        const orderHashBuff = orderHashUtils.getOrderHashBuffer(order);
-        const signature = signingUtils.signMessage(orderHashBuff, this.makerPrivateKey, SignatureType.EthSign);
-        const signedOrder = {
-            ...order,
-            signature: `0x${signature.toString('hex')}`,
-        };
-
-        const balanceAndProxyAllowanceFetcher = new SimpleAssetBalanceAndProxyAllowanceFetcher(this.assetWrapper);
-        const orderFilledCancelledFetcher = new SimpleOrderFilledCancelledFetcher(
-            this.exchangeWrapper,
-            this.zrxAssetData,
-        );
-
-        // 3. Figure out fill amount
-        const takerAssetFillAmount = await this._getTakerAssetFillAmountAsync(
-            signedOrder,
-            fillScenario.takerAssetFillAmountScenario,
-            balanceAndProxyAllowanceFetcher,
-            orderFilledCancelledFetcher,
-        );
-
-        // 4. Permutate the maker and taker balance/allowance scenarios
-        await this._modifyTraderStateAsync(
-            fillScenario.makerStateScenario,
-            fillScenario.takerStateScenario,
-            signedOrder,
-            takerAssetFillAmount,
-        );
-
-        // 5. If I fill it by X, what are the resulting balances/allowances/filled amounts expected?
-        const orderValidationUtils = new OrderValidationUtils(orderFilledCancelledFetcher);
-        const lazyStore = new BalanceAndProxyAllowanceLazyStore(balanceAndProxyAllowanceFetcher);
-        const exchangeTransferSimulator = new ExchangeTransferSimulator(lazyStore);
-
-        let fillRevertReasonIfExists;
-        try {
-            await orderValidationUtils.validateFillOrderThrowIfInvalidAsync(
-                exchangeTransferSimulator,
-                provider,
-                signedOrder,
-                takerAssetFillAmount,
-                this.takerAddress,
-                this.zrxAssetData,
-            );
-            if (isVerbose) {
-                logUtils.log(`Expecting fillOrder to succeed.`);
-            }
-        } catch (err) {
-            fillRevertReasonIfExists = err.message;
-            if (isVerbose) {
-                logUtils.log(`Expecting fillOrder to fail with:`);
-                logUtils.log(err);
-            }
-        }
-
-        // 6. Fill the order
-        await this._fillOrderAndAssertOutcomeAsync(
-            signedOrder,
-            takerAssetFillAmount,
-            lazyStore,
-            fillRevertReasonIfExists,
-        );
-    }
-    private async _fillOrderAndAssertOutcomeAsync(
-        signedOrder: SignedOrder,
-        takerAssetFillAmount: BigNumber,
-        lazyStore: BalanceAndProxyAllowanceLazyStore,
-        fillRevertReasonIfExists: RevertReason | undefined,
-    ): Promise<void> {
-        if (!_.isUndefined(fillRevertReasonIfExists)) {
-            return expectRevertReasonOrAlwaysFailingTransactionAsync(
-                this.exchangeWrapper.fillOrderAsync(signedOrder, this.takerAddress, { takerAssetFillAmount }),
-                fillRevertReasonIfExists,
-            );
-        }
-
-        const makerAddress = signedOrder.makerAddress;
-        const makerAssetData = signedOrder.makerAssetData;
-        const takerAssetData = signedOrder.takerAssetData;
-        const feeRecipient = signedOrder.feeRecipientAddress;
-
-        const expMakerAssetBalanceOfMaker = await lazyStore.getBalanceAsync(makerAssetData, makerAddress);
-        const expMakerAssetAllowanceOfMaker = await lazyStore.getProxyAllowanceAsync(makerAssetData, makerAddress);
-        const expTakerAssetBalanceOfMaker = await lazyStore.getBalanceAsync(takerAssetData, makerAddress);
-        const expZRXAssetBalanceOfMaker = await lazyStore.getBalanceAsync(this.zrxAssetData, makerAddress);
-        const expZRXAssetAllowanceOfMaker = await lazyStore.getProxyAllowanceAsync(this.zrxAssetData, makerAddress);
-        const expTakerAssetBalanceOfTaker = await lazyStore.getBalanceAsync(takerAssetData, this.takerAddress);
-        const expTakerAssetAllowanceOfTaker = await lazyStore.getProxyAllowanceAsync(takerAssetData, this.takerAddress);
-        const expMakerAssetBalanceOfTaker = await lazyStore.getBalanceAsync(makerAssetData, this.takerAddress);
-        const expZRXAssetBalanceOfTaker = await lazyStore.getBalanceAsync(this.zrxAssetData, this.takerAddress);
-        const expZRXAssetAllowanceOfTaker = await lazyStore.getProxyAllowanceAsync(
-            this.zrxAssetData,
-            this.takerAddress,
-        );
-        const expZRXAssetBalanceOfFeeRecipient = await lazyStore.getBalanceAsync(this.zrxAssetData, feeRecipient);
-
-        const orderHash = orderHashUtils.getOrderHashHex(signedOrder);
-        const alreadyFilledTakerAmount = await this.exchangeWrapper.getTakerAssetFilledAmountAsync(orderHash);
-        const remainingTakerAmountToFill = signedOrder.takerAssetAmount.minus(alreadyFilledTakerAmount);
-        const expFilledTakerAmount = takerAssetFillAmount.gt(remainingTakerAmountToFill)
-            ? remainingTakerAmountToFill
-            : alreadyFilledTakerAmount.add(takerAssetFillAmount);
-
-        const expFilledMakerAmount = orderUtils.getPartialAmount(
-            expFilledTakerAmount,
-            signedOrder.takerAssetAmount,
-            signedOrder.makerAssetAmount,
-        );
-
-        // - Let's fill the order!
-        const txReceipt = await this.exchangeWrapper.fillOrderAsync(signedOrder, this.takerAddress, {
-            takerAssetFillAmount,
-        });
-
-        const actFilledTakerAmount = await this.exchangeWrapper.getTakerAssetFilledAmountAsync(orderHash);
-        expect(actFilledTakerAmount).to.be.bignumber.equal(expFilledTakerAmount, 'filledTakerAmount');
-
-        expect(txReceipt.logs.length).to.be.equal(1, 'logs length');
-        // tslint:disable-next-line:no-unnecessary-type-assertion
-        const log = txReceipt.logs[0] as LogWithDecodedArgs<FillContractEventArgs>;
-        expect(log.args.makerAddress).to.be.equal(makerAddress, 'log.args.makerAddress');
-        expect(log.args.takerAddress).to.be.equal(this.takerAddress, 'log.args.this.takerAddress');
-        expect(log.args.feeRecipientAddress).to.be.equal(feeRecipient, 'log.args.feeRecipientAddress');
-        expect(log.args.makerAssetFilledAmount).to.be.bignumber.equal(
-            expFilledMakerAmount,
-            'log.args.makerAssetFilledAmount',
-        );
-        expect(log.args.takerAssetFilledAmount).to.be.bignumber.equal(
-            expFilledTakerAmount,
-            'log.args.takerAssetFilledAmount',
-        );
-        const expMakerFeePaid = orderUtils.getPartialAmount(
-            expFilledTakerAmount,
-            signedOrder.takerAssetAmount,
-            signedOrder.makerFee,
-        );
-        expect(log.args.makerFeePaid).to.be.bignumber.equal(expMakerFeePaid, 'log.args.makerFeePaid');
-        const expTakerFeePaid = orderUtils.getPartialAmount(
-            expFilledTakerAmount,
-            signedOrder.takerAssetAmount,
-            signedOrder.takerFee,
-        );
-        expect(log.args.takerFeePaid).to.be.bignumber.equal(expTakerFeePaid, 'logs.args.takerFeePaid');
-        expect(log.args.orderHash).to.be.equal(orderHash, 'log.args.orderHash');
-        expect(log.args.makerAssetData).to.be.equal(makerAssetData, 'log.args.makerAssetData');
-        expect(log.args.takerAssetData).to.be.equal(takerAssetData, 'log.args.takerAssetData');
-
-        const actMakerAssetBalanceOfMaker = await this.assetWrapper.getBalanceAsync(makerAddress, makerAssetData);
-        expect(actMakerAssetBalanceOfMaker).to.be.bignumber.equal(
-            expMakerAssetBalanceOfMaker,
-            'makerAssetBalanceOfMaker',
-        );
-
-        const actMakerAssetAllowanceOfMaker = await this.assetWrapper.getProxyAllowanceAsync(
-            makerAddress,
-            makerAssetData,
-        );
-        expect(actMakerAssetAllowanceOfMaker).to.be.bignumber.equal(
-            expMakerAssetAllowanceOfMaker,
-            'makerAssetAllowanceOfMaker',
-        );
-
-        const actTakerAssetBalanceOfMaker = await this.assetWrapper.getBalanceAsync(makerAddress, takerAssetData);
-        expect(actTakerAssetBalanceOfMaker).to.be.bignumber.equal(
-            expTakerAssetBalanceOfMaker,
-            'takerAssetBalanceOfMaker',
-        );
-
-        const actZRXAssetBalanceOfMaker = await this.assetWrapper.getBalanceAsync(makerAddress, this.zrxAssetData);
-        expect(actZRXAssetBalanceOfMaker).to.be.bignumber.equal(expZRXAssetBalanceOfMaker, 'ZRXAssetBalanceOfMaker');
-
-        const actZRXAssetAllowanceOfMaker = await this.assetWrapper.getProxyAllowanceAsync(
-            makerAddress,
-            this.zrxAssetData,
-        );
-        expect(actZRXAssetAllowanceOfMaker).to.be.bignumber.equal(
-            expZRXAssetAllowanceOfMaker,
-            'ZRXAssetAllowanceOfMaker',
-        );
-
-        const actTakerAssetBalanceOfTaker = await this.assetWrapper.getBalanceAsync(this.takerAddress, takerAssetData);
-        expect(actTakerAssetBalanceOfTaker).to.be.bignumber.equal(
-            expTakerAssetBalanceOfTaker,
-            'TakerAssetBalanceOfTaker',
-        );
-
-        const actTakerAssetAllowanceOfTaker = await this.assetWrapper.getProxyAllowanceAsync(
-            this.takerAddress,
-            takerAssetData,
-        );
-
-        expect(actTakerAssetAllowanceOfTaker).to.be.bignumber.equal(
-            expTakerAssetAllowanceOfTaker,
-            'TakerAssetAllowanceOfTaker',
-        );
-
-        const actMakerAssetBalanceOfTaker = await this.assetWrapper.getBalanceAsync(this.takerAddress, makerAssetData);
-        expect(actMakerAssetBalanceOfTaker).to.be.bignumber.equal(
-            expMakerAssetBalanceOfTaker,
-            'MakerAssetBalanceOfTaker',
-        );
-
-        const actZRXAssetBalanceOfTaker = await this.assetWrapper.getBalanceAsync(this.takerAddress, this.zrxAssetData);
-        expect(actZRXAssetBalanceOfTaker).to.be.bignumber.equal(expZRXAssetBalanceOfTaker, 'ZRXAssetBalanceOfTaker');
-
-        const actZRXAssetAllowanceOfTaker = await this.assetWrapper.getProxyAllowanceAsync(
-            this.takerAddress,
-            this.zrxAssetData,
-        );
-        expect(actZRXAssetAllowanceOfTaker).to.be.bignumber.equal(
-            expZRXAssetAllowanceOfTaker,
-            'ZRXAssetAllowanceOfTaker',
-        );
-
-        const actZRXAssetBalanceOfFeeRecipient = await this.assetWrapper.getBalanceAsync(
-            feeRecipient,
-            this.zrxAssetData,
-        );
-        expect(actZRXAssetBalanceOfFeeRecipient).to.be.bignumber.equal(
-            expZRXAssetBalanceOfFeeRecipient,
-            'ZRXAssetBalanceOfFeeRecipient',
-        );
-    }
-    private async _getTakerAssetFillAmountAsync(
-        signedOrder: SignedOrder,
-        takerAssetFillAmountScenario: TakerAssetFillAmountScenario,
-        balanceAndProxyAllowanceFetcher: SimpleAssetBalanceAndProxyAllowanceFetcher,
-        orderFilledCancelledFetcher: SimpleOrderFilledCancelledFetcher,
-    ): Promise<BigNumber> {
-        const orderStateUtils = new OrderStateUtils(balanceAndProxyAllowanceFetcher, orderFilledCancelledFetcher);
-        const fillableTakerAssetAmount = await orderStateUtils.getMaxFillableTakerAssetAmountAsync(
-            signedOrder,
-            this.takerAddress,
-        );
-
-        let takerAssetFillAmount;
-        switch (takerAssetFillAmountScenario) {
-            case TakerAssetFillAmountScenario.Zero:
-                takerAssetFillAmount = new BigNumber(0);
-                break;
-
-            case TakerAssetFillAmountScenario.ExactlyRemainingFillableTakerAssetAmount:
-                takerAssetFillAmount = fillableTakerAssetAmount;
-                break;
-
-            case TakerAssetFillAmountScenario.GreaterThanRemainingFillableTakerAssetAmount:
-                takerAssetFillAmount = fillableTakerAssetAmount.add(1);
-                break;
-
-            case TakerAssetFillAmountScenario.LessThanRemainingFillableTakerAssetAmount:
-                const takerAssetProxyId = assetProxyUtils.decodeAssetDataId(signedOrder.takerAssetData);
-                const makerAssetProxyId = assetProxyUtils.decodeAssetDataId(signedOrder.makerAssetData);
-                const isEitherAssetERC721 =
-                    takerAssetProxyId === AssetProxyId.ERC721 || makerAssetProxyId === AssetProxyId.ERC721;
-                if (isEitherAssetERC721) {
-                    throw new Error(
-                        'Cannot test `TakerAssetFillAmountScenario.LessThanRemainingFillableTakerAssetAmount` together with ERC721 assets since orders involving ERC721 must always be filled exactly.',
-                    );
-                }
-                takerAssetFillAmount = fillableTakerAssetAmount.div(2).floor();
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr('TakerAssetFillAmountScenario', takerAssetFillAmountScenario);
-        }
-
-        return takerAssetFillAmount;
-    }
-    private async _modifyTraderStateAsync(
-        makerStateScenario: TraderStateScenario,
-        takerStateScenario: TraderStateScenario,
-        signedOrder: SignedOrder,
-        takerAssetFillAmount: BigNumber,
-    ): Promise<void> {
-        const makerAssetFillAmount = orderUtils.getPartialAmount(
-            takerAssetFillAmount,
-            signedOrder.takerAssetAmount,
-            signedOrder.makerAssetAmount,
-        );
-        switch (makerStateScenario.traderAssetBalance) {
-            case BalanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case BalanceAmountScenario.TooLow:
-                if (makerAssetFillAmount.eq(0)) {
-                    throw new Error(`Cannot set makerAssetBalanceOfMaker TooLow if makerAssetFillAmount is 0`);
-                }
-                const tooLowBalance = makerAssetFillAmount.minus(1);
-                await this.assetWrapper.setBalanceAsync(
-                    signedOrder.makerAddress,
-                    signedOrder.makerAssetData,
-                    tooLowBalance,
-                );
-                break;
-
-            case BalanceAmountScenario.Exact:
-                const exactBalance = makerAssetFillAmount;
-                await this.assetWrapper.setBalanceAsync(
-                    signedOrder.makerAddress,
-                    signedOrder.makerAssetData,
-                    exactBalance,
-                );
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr(
-                    'makerStateScenario.traderAssetBalance',
-                    makerStateScenario.traderAssetBalance,
-                );
-        }
-
-        const makerFee = orderUtils.getPartialAmount(
-            takerAssetFillAmount,
-            signedOrder.takerAssetAmount,
-            signedOrder.makerFee,
-        );
-        switch (makerStateScenario.zrxFeeBalance) {
-            case BalanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case BalanceAmountScenario.TooLow:
-                if (makerFee.eq(0)) {
-                    throw new Error(`Cannot set zrxAsserBalanceOfMaker TooLow if makerFee is 0`);
-                }
-                const tooLowBalance = makerFee.minus(1);
-                await this.assetWrapper.setBalanceAsync(signedOrder.makerAddress, this.zrxAssetData, tooLowBalance);
-                break;
-
-            case BalanceAmountScenario.Exact:
-                const exactBalance = makerFee;
-                await this.assetWrapper.setBalanceAsync(signedOrder.makerAddress, this.zrxAssetData, exactBalance);
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr('makerStateScenario.zrxFeeBalance', makerStateScenario.zrxFeeBalance);
-        }
-
-        switch (makerStateScenario.traderAssetAllowance) {
-            case AllowanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case AllowanceAmountScenario.TooLow:
-                const tooLowAllowance = makerAssetFillAmount.minus(1);
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.makerAddress,
-                    signedOrder.makerAssetData,
-                    tooLowAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Exact:
-                const exactAllowance = makerAssetFillAmount;
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.makerAddress,
-                    signedOrder.makerAssetData,
-                    exactAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Unlimited:
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.makerAddress,
-                    signedOrder.makerAssetData,
-                    constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
-                );
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr(
-                    'makerStateScenario.traderAssetAllowance',
-                    makerStateScenario.traderAssetAllowance,
-                );
-        }
-
-        switch (makerStateScenario.zrxFeeAllowance) {
-            case AllowanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case AllowanceAmountScenario.TooLow:
-                const tooLowAllowance = makerFee.minus(1);
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.makerAddress,
-                    this.zrxAssetData,
-                    tooLowAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Exact:
-                const exactAllowance = makerFee;
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.makerAddress,
-                    this.zrxAssetData,
-                    exactAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Unlimited:
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.makerAddress,
-                    this.zrxAssetData,
-                    constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
-                );
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr(
-                    'makerStateScenario.zrxFeeAllowance',
-                    makerStateScenario.zrxFeeAllowance,
-                );
-        }
-
-        switch (takerStateScenario.traderAssetBalance) {
-            case BalanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case BalanceAmountScenario.TooLow:
-                if (takerAssetFillAmount.eq(0)) {
-                    throw new Error(`Cannot set takerAssetBalanceOfTaker TooLow if takerAssetFillAmount is 0`);
-                }
-                const tooLowBalance = takerAssetFillAmount.minus(1);
-                await this.assetWrapper.setBalanceAsync(this.takerAddress, signedOrder.takerAssetData, tooLowBalance);
-                break;
-
-            case BalanceAmountScenario.Exact:
-                const exactBalance = takerAssetFillAmount;
-                await this.assetWrapper.setBalanceAsync(this.takerAddress, signedOrder.takerAssetData, exactBalance);
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr(
-                    'takerStateScenario.traderAssetBalance',
-                    takerStateScenario.traderAssetBalance,
-                );
-        }
-
-        const takerFee = orderUtils.getPartialAmount(
-            takerAssetFillAmount,
-            signedOrder.takerAssetAmount,
-            signedOrder.takerFee,
-        );
-        switch (takerStateScenario.zrxFeeBalance) {
-            case BalanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case BalanceAmountScenario.TooLow:
-                if (takerFee.eq(0)) {
-                    throw new Error(`Cannot set zrxAssetBalanceOfTaker TooLow if takerFee is 0`);
-                }
-                const tooLowBalance = takerFee.minus(1);
-                await this.assetWrapper.setBalanceAsync(this.takerAddress, this.zrxAssetData, tooLowBalance);
-                break;
-
-            case BalanceAmountScenario.Exact:
-                const exactBalance = takerFee;
-                await this.assetWrapper.setBalanceAsync(this.takerAddress, this.zrxAssetData, exactBalance);
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr('takerStateScenario.zrxFeeBalance', takerStateScenario.zrxFeeBalance);
-        }
-
-        switch (takerStateScenario.traderAssetAllowance) {
-            case AllowanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case AllowanceAmountScenario.TooLow:
-                const tooLowAllowance = takerAssetFillAmount.minus(1);
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    this.takerAddress,
-                    signedOrder.takerAssetData,
-                    tooLowAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Exact:
-                const exactAllowance = takerAssetFillAmount;
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    this.takerAddress,
-                    signedOrder.takerAssetData,
-                    exactAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Unlimited:
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    this.takerAddress,
-                    signedOrder.takerAssetData,
-                    constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
-                );
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr(
-                    'takerStateScenario.traderAssetAllowance',
-                    takerStateScenario.traderAssetAllowance,
-                );
-        }
-
-        switch (takerStateScenario.zrxFeeAllowance) {
-            case AllowanceAmountScenario.Higher:
-                break; // Noop since this is already the default
-
-            case AllowanceAmountScenario.TooLow:
-                const tooLowAllowance = takerFee.minus(1);
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.takerAddress,
-                    this.zrxAssetData,
-                    tooLowAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Exact:
-                const exactAllowance = takerFee;
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.takerAddress,
-                    this.zrxAssetData,
-                    exactAllowance,
-                );
-                break;
-
-            case AllowanceAmountScenario.Unlimited:
-                await this.assetWrapper.setProxyAllowanceAsync(
-                    signedOrder.takerAddress,
-                    this.zrxAssetData,
-                    constants.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
-                );
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr(
-                    'takerStateScenario.zrxFeeAllowance',
-                    takerStateScenario.zrxFeeAllowance,
-                );
-        }
-    }
-} // tslint:disable:max-file-line-count
diff --git a/packages/contracts/src/utils/coverage.ts b/packages/contracts/src/utils/coverage.ts
deleted file mode 100644
index de29a3ecc..000000000
--- a/packages/contracts/src/utils/coverage.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { devConstants } from '@0xproject/dev-utils';
-import { CoverageSubprovider, SolCompilerArtifactAdapter } from '@0xproject/sol-cov';
-import * as _ from 'lodash';
-
-let coverageSubprovider: CoverageSubprovider;
-
-export const coverage = {
-    getCoverageSubproviderSingleton(): CoverageSubprovider {
-        if (_.isUndefined(coverageSubprovider)) {
-            coverageSubprovider = coverage._getCoverageSubprovider();
-        }
-        return coverageSubprovider;
-    },
-    _getCoverageSubprovider(): CoverageSubprovider {
-        const defaultFromAddress = devConstants.TESTRPC_FIRST_ADDRESS;
-        const solCompilerArtifactAdapter = new SolCompilerArtifactAdapter();
-        const isVerbose = true;
-        const subprovider = new CoverageSubprovider(solCompilerArtifactAdapter, defaultFromAddress, isVerbose);
-        return subprovider;
-    },
-};
diff --git a/packages/contracts/src/utils/erc20_wrapper.ts b/packages/contracts/src/utils/erc20_wrapper.ts
deleted file mode 100644
index 7f00e2061..000000000
--- a/packages/contracts/src/utils/erc20_wrapper.ts
+++ /dev/null
@@ -1,167 +0,0 @@
-import { assetProxyUtils } from '@0xproject/order-utils';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { Provider } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { DummyERC20TokenContract } from '../generated_contract_wrappers/dummy_e_r_c20_token';
-import { ERC20ProxyContract } from '../generated_contract_wrappers/e_r_c20_proxy';
-
-import { artifacts } from './artifacts';
-import { constants } from './constants';
-import { ERC20BalancesByOwner } from './types';
-import { txDefaults } from './web3_wrapper';
-
-export class ERC20Wrapper {
-    private _tokenOwnerAddresses: string[];
-    private _contractOwnerAddress: string;
-    private _web3Wrapper: Web3Wrapper;
-    private _provider: Provider;
-    private _dummyTokenContracts: DummyERC20TokenContract[];
-    private _proxyContract?: ERC20ProxyContract;
-    private _proxyIdIfExists?: string;
-    constructor(provider: Provider, tokenOwnerAddresses: string[], contractOwnerAddress: string) {
-        this._dummyTokenContracts = [];
-        this._web3Wrapper = new Web3Wrapper(provider);
-        this._provider = provider;
-        this._tokenOwnerAddresses = tokenOwnerAddresses;
-        this._contractOwnerAddress = contractOwnerAddress;
-    }
-    public async deployDummyTokensAsync(
-        numberToDeploy: number,
-        decimals: BigNumber,
-    ): Promise<DummyERC20TokenContract[]> {
-        for (let i = 0; i < numberToDeploy; i++) {
-            this._dummyTokenContracts.push(
-                await DummyERC20TokenContract.deployFrom0xArtifactAsync(
-                    artifacts.DummyERC20Token,
-                    this._provider,
-                    txDefaults,
-                    constants.DUMMY_TOKEN_NAME,
-                    constants.DUMMY_TOKEN_SYMBOL,
-                    decimals,
-                    constants.DUMMY_TOKEN_TOTAL_SUPPLY,
-                ),
-            );
-        }
-        return this._dummyTokenContracts;
-    }
-    public async deployProxyAsync(): Promise<ERC20ProxyContract> {
-        this._proxyContract = await ERC20ProxyContract.deployFrom0xArtifactAsync(
-            artifacts.ERC20Proxy,
-            this._provider,
-            txDefaults,
-        );
-        this._proxyIdIfExists = await this._proxyContract.getProxyId.callAsync();
-        return this._proxyContract;
-    }
-    public getProxyId(): string {
-        this._validateProxyContractExistsOrThrow();
-        return this._proxyIdIfExists as string;
-    }
-    public async setBalancesAndAllowancesAsync(): Promise<void> {
-        this._validateDummyTokenContractsExistOrThrow();
-        this._validateProxyContractExistsOrThrow();
-        for (const dummyTokenContract of this._dummyTokenContracts) {
-            for (const tokenOwnerAddress of this._tokenOwnerAddresses) {
-                await this._web3Wrapper.awaitTransactionSuccessAsync(
-                    await dummyTokenContract.setBalance.sendTransactionAsync(
-                        tokenOwnerAddress,
-                        constants.INITIAL_ERC20_BALANCE,
-                        { from: this._contractOwnerAddress },
-                    ),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-                await this._web3Wrapper.awaitTransactionSuccessAsync(
-                    await dummyTokenContract.approve.sendTransactionAsync(
-                        (this._proxyContract as ERC20ProxyContract).address,
-                        constants.INITIAL_ERC20_ALLOWANCE,
-                        { from: tokenOwnerAddress },
-                    ),
-                    constants.AWAIT_TRANSACTION_MINED_MS,
-                );
-            }
-        }
-    }
-    public async getBalanceAsync(userAddress: string, assetData: string): Promise<BigNumber> {
-        const tokenContract = this._getTokenContractFromAssetData(assetData);
-        const balance = new BigNumber(await tokenContract.balanceOf.callAsync(userAddress));
-        return balance;
-    }
-    public async setBalanceAsync(userAddress: string, assetData: string, amount: BigNumber): Promise<void> {
-        const tokenContract = this._getTokenContractFromAssetData(assetData);
-        await this._web3Wrapper.awaitTransactionSuccessAsync(
-            await tokenContract.setBalance.sendTransactionAsync(userAddress, amount, {
-                from: this._contractOwnerAddress,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-    }
-    public async getProxyAllowanceAsync(userAddress: string, assetData: string): Promise<BigNumber> {
-        const tokenContract = this._getTokenContractFromAssetData(assetData);
-        const proxyAddress = (this._proxyContract as ERC20ProxyContract).address;
-        const allowance = new BigNumber(await tokenContract.allowance.callAsync(userAddress, proxyAddress));
-        return allowance;
-    }
-    public async setAllowanceAsync(userAddress: string, assetData: string, amount: BigNumber): Promise<void> {
-        const tokenContract = this._getTokenContractFromAssetData(assetData);
-        const proxyAddress = (this._proxyContract as ERC20ProxyContract).address;
-        await this._web3Wrapper.awaitTransactionSuccessAsync(
-            await tokenContract.approve.sendTransactionAsync(proxyAddress, amount, {
-                from: userAddress,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-    }
-    public async getBalancesAsync(): Promise<ERC20BalancesByOwner> {
-        this._validateDummyTokenContractsExistOrThrow();
-        const balancesByOwner: ERC20BalancesByOwner = {};
-        const balances: BigNumber[] = [];
-        const balanceInfo: Array<{ tokenOwnerAddress: string; tokenAddress: string }> = [];
-        for (const dummyTokenContract of this._dummyTokenContracts) {
-            for (const tokenOwnerAddress of this._tokenOwnerAddresses) {
-                balances.push(await dummyTokenContract.balanceOf.callAsync(tokenOwnerAddress));
-                balanceInfo.push({
-                    tokenOwnerAddress,
-                    tokenAddress: dummyTokenContract.address,
-                });
-            }
-        }
-        _.forEach(balances, (balance, balanceIndex) => {
-            const tokenAddress = balanceInfo[balanceIndex].tokenAddress;
-            const tokenOwnerAddress = balanceInfo[balanceIndex].tokenOwnerAddress;
-            if (_.isUndefined(balancesByOwner[tokenOwnerAddress])) {
-                balancesByOwner[tokenOwnerAddress] = {};
-            }
-            const wrappedBalance = new BigNumber(balance);
-            balancesByOwner[tokenOwnerAddress][tokenAddress] = wrappedBalance;
-        });
-        return balancesByOwner;
-    }
-    public getTokenOwnerAddresses(): string[] {
-        return this._tokenOwnerAddresses;
-    }
-    public getTokenAddresses(): string[] {
-        const tokenAddresses = _.map(this._dummyTokenContracts, dummyTokenContract => dummyTokenContract.address);
-        return tokenAddresses;
-    }
-    private _getTokenContractFromAssetData(assetData: string): DummyERC20TokenContract {
-        const erc20ProxyData = assetProxyUtils.decodeERC20AssetData(assetData);
-        const tokenAddress = erc20ProxyData.tokenAddress;
-        const tokenContractIfExists = _.find(this._dummyTokenContracts, c => c.address === tokenAddress);
-        if (_.isUndefined(tokenContractIfExists)) {
-            throw new Error(`Token: ${tokenAddress} was not deployed through ERC20Wrapper`);
-        }
-        return tokenContractIfExists;
-    }
-    private _validateDummyTokenContractsExistOrThrow(): void {
-        if (_.isUndefined(this._dummyTokenContracts)) {
-            throw new Error('Dummy ERC20 tokens not yet deployed, please call "deployDummyTokensAsync"');
-        }
-    }
-    private _validateProxyContractExistsOrThrow(): void {
-        if (_.isUndefined(this._proxyContract)) {
-            throw new Error('ERC20 proxy contract not yet deployed, please call "deployProxyAsync"');
-        }
-    }
-}
diff --git a/packages/contracts/src/utils/erc721_wrapper.ts b/packages/contracts/src/utils/erc721_wrapper.ts
deleted file mode 100644
index 309135ae4..000000000
--- a/packages/contracts/src/utils/erc721_wrapper.ts
+++ /dev/null
@@ -1,236 +0,0 @@
-import { generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { Provider } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { DummyERC721TokenContract } from '../generated_contract_wrappers/dummy_e_r_c721_token';
-import { ERC721ProxyContract } from '../generated_contract_wrappers/e_r_c721_proxy';
-
-import { artifacts } from './artifacts';
-import { constants } from './constants';
-import { ERC721TokenIdsByOwner } from './types';
-import { txDefaults } from './web3_wrapper';
-
-export class ERC721Wrapper {
-    private _tokenOwnerAddresses: string[];
-    private _contractOwnerAddress: string;
-    private _web3Wrapper: Web3Wrapper;
-    private _provider: Provider;
-    private _dummyTokenContracts: DummyERC721TokenContract[];
-    private _proxyContract?: ERC721ProxyContract;
-    private _proxyIdIfExists?: string;
-    private _initialTokenIdsByOwner: ERC721TokenIdsByOwner = {};
-    constructor(provider: Provider, tokenOwnerAddresses: string[], contractOwnerAddress: string) {
-        this._web3Wrapper = new Web3Wrapper(provider);
-        this._provider = provider;
-        this._dummyTokenContracts = [];
-        this._tokenOwnerAddresses = tokenOwnerAddresses;
-        this._contractOwnerAddress = contractOwnerAddress;
-    }
-    public async deployDummyTokensAsync(): Promise<DummyERC721TokenContract[]> {
-        for (let i = 0; i < constants.NUM_DUMMY_ERC721_TO_DEPLOY; i++) {
-            this._dummyTokenContracts.push(
-                await DummyERC721TokenContract.deployFrom0xArtifactAsync(
-                    artifacts.DummyERC721Token,
-                    this._provider,
-                    txDefaults,
-                    constants.DUMMY_TOKEN_NAME,
-                    constants.DUMMY_TOKEN_SYMBOL,
-                ),
-            );
-        }
-        return this._dummyTokenContracts;
-    }
-    public async deployProxyAsync(): Promise<ERC721ProxyContract> {
-        this._proxyContract = await ERC721ProxyContract.deployFrom0xArtifactAsync(
-            artifacts.ERC721Proxy,
-            this._provider,
-            txDefaults,
-        );
-        this._proxyIdIfExists = await this._proxyContract.getProxyId.callAsync();
-        return this._proxyContract;
-    }
-    public getProxyId(): string {
-        this._validateProxyContractExistsOrThrow();
-        return this._proxyIdIfExists as string;
-    }
-    public async setBalancesAndAllowancesAsync(): Promise<void> {
-        this._validateDummyTokenContractsExistOrThrow();
-        this._validateProxyContractExistsOrThrow();
-        this._initialTokenIdsByOwner = {};
-        for (const dummyTokenContract of this._dummyTokenContracts) {
-            for (const tokenOwnerAddress of this._tokenOwnerAddresses) {
-                for (let i = 0; i < constants.NUM_ERC721_TOKENS_TO_MINT; i++) {
-                    const tokenId = generatePseudoRandomSalt();
-                    await this.mintAsync(dummyTokenContract.address, tokenId, tokenOwnerAddress);
-                    if (_.isUndefined(this._initialTokenIdsByOwner[tokenOwnerAddress])) {
-                        this._initialTokenIdsByOwner[tokenOwnerAddress] = {
-                            [dummyTokenContract.address]: [],
-                        };
-                    }
-                    if (_.isUndefined(this._initialTokenIdsByOwner[tokenOwnerAddress][dummyTokenContract.address])) {
-                        this._initialTokenIdsByOwner[tokenOwnerAddress][dummyTokenContract.address] = [];
-                    }
-                    this._initialTokenIdsByOwner[tokenOwnerAddress][dummyTokenContract.address].push(tokenId);
-
-                    await this.approveProxyAsync(dummyTokenContract.address, tokenId);
-                }
-            }
-        }
-    }
-    public async doesTokenExistAsync(tokenAddress: string, tokenId: BigNumber): Promise<boolean> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        const doesExist = await tokenContract.exists.callAsync(tokenId);
-        return doesExist;
-    }
-    public async approveProxyAsync(tokenAddress: string, tokenId: BigNumber): Promise<void> {
-        const proxyAddress = (this._proxyContract as ERC721ProxyContract).address;
-        await this.approveAsync(proxyAddress, tokenAddress, tokenId);
-    }
-    public async approveProxyForAllAsync(tokenAddress: string, tokenId: BigNumber, isApproved: boolean): Promise<void> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        const tokenOwner = await this.ownerOfAsync(tokenAddress, tokenId);
-        const proxyAddress = (this._proxyContract as ERC721ProxyContract).address;
-        await this._web3Wrapper.awaitTransactionSuccessAsync(
-            await tokenContract.setApprovalForAll.sendTransactionAsync(proxyAddress, isApproved, {
-                from: tokenOwner,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-    }
-    public async approveAsync(to: string, tokenAddress: string, tokenId: BigNumber): Promise<void> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        const tokenOwner = await this.ownerOfAsync(tokenAddress, tokenId);
-        await this._web3Wrapper.awaitTransactionSuccessAsync(
-            await tokenContract.approve.sendTransactionAsync(to, tokenId, {
-                from: tokenOwner,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-    }
-    public async transferFromAsync(
-        tokenAddress: string,
-        tokenId: BigNumber,
-        currentOwner: string,
-        userAddress: string,
-    ): Promise<void> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        await this._web3Wrapper.awaitTransactionSuccessAsync(
-            await tokenContract.transferFrom.sendTransactionAsync(currentOwner, userAddress, tokenId, {
-                from: currentOwner,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-    }
-    public async mintAsync(tokenAddress: string, tokenId: BigNumber, userAddress: string): Promise<void> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        await this._web3Wrapper.awaitTransactionSuccessAsync(
-            await tokenContract.mint.sendTransactionAsync(userAddress, tokenId, {
-                from: this._contractOwnerAddress,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-    }
-    public async burnAsync(tokenAddress: string, tokenId: BigNumber, owner: string): Promise<void> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        await this._web3Wrapper.awaitTransactionSuccessAsync(
-            await tokenContract.burn.sendTransactionAsync(owner, tokenId, {
-                from: this._contractOwnerAddress,
-            }),
-            constants.AWAIT_TRANSACTION_MINED_MS,
-        );
-    }
-    public async ownerOfAsync(tokenAddress: string, tokenId: BigNumber): Promise<string> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        const owner = await tokenContract.ownerOf.callAsync(tokenId);
-        return owner;
-    }
-    public async isOwnerAsync(userAddress: string, tokenAddress: string, tokenId: BigNumber): Promise<boolean> {
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        const tokenOwner = await tokenContract.ownerOf.callAsync(tokenId);
-        const isOwner = tokenOwner === userAddress;
-        return isOwner;
-    }
-    public async isProxyApprovedForAllAsync(userAddress: string, tokenAddress: string): Promise<boolean> {
-        this._validateProxyContractExistsOrThrow();
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        const operator = (this._proxyContract as ERC721ProxyContract).address;
-        const didApproveAll = await tokenContract.isApprovedForAll.callAsync(userAddress, operator);
-        return didApproveAll;
-    }
-    public async isProxyApprovedAsync(tokenAddress: string, tokenId: BigNumber): Promise<boolean> {
-        this._validateProxyContractExistsOrThrow();
-        const tokenContract = this._getTokenContractFromAssetData(tokenAddress);
-        const approvedAddress = await tokenContract.getApproved.callAsync(tokenId);
-        const proxyAddress = (this._proxyContract as ERC721ProxyContract).address;
-        const isProxyAnApprovedOperator = approvedAddress === proxyAddress;
-        return isProxyAnApprovedOperator;
-    }
-    public async getBalancesAsync(): Promise<ERC721TokenIdsByOwner> {
-        this._validateDummyTokenContractsExistOrThrow();
-        this._validateBalancesAndAllowancesSetOrThrow();
-        const tokenIdsByOwner: ERC721TokenIdsByOwner = {};
-        const tokenOwnerAddresses: string[] = [];
-        const tokenInfo: Array<{ tokenId: BigNumber; tokenAddress: string }> = [];
-        for (const dummyTokenContract of this._dummyTokenContracts) {
-            for (const tokenOwnerAddress of this._tokenOwnerAddresses) {
-                const initialTokenOwnerIds = this._initialTokenIdsByOwner[tokenOwnerAddress][
-                    dummyTokenContract.address
-                ];
-                for (const tokenId of initialTokenOwnerIds) {
-                    tokenOwnerAddresses.push(await dummyTokenContract.ownerOf.callAsync(tokenId));
-                    tokenInfo.push({
-                        tokenId,
-                        tokenAddress: dummyTokenContract.address,
-                    });
-                }
-            }
-        }
-        _.forEach(tokenOwnerAddresses, (tokenOwnerAddress, ownerIndex) => {
-            const tokenAddress = tokenInfo[ownerIndex].tokenAddress;
-            const tokenId = tokenInfo[ownerIndex].tokenId;
-            if (_.isUndefined(tokenIdsByOwner[tokenOwnerAddress])) {
-                tokenIdsByOwner[tokenOwnerAddress] = {
-                    [tokenAddress]: [],
-                };
-            }
-            if (_.isUndefined(tokenIdsByOwner[tokenOwnerAddress][tokenAddress])) {
-                tokenIdsByOwner[tokenOwnerAddress][tokenAddress] = [];
-            }
-            tokenIdsByOwner[tokenOwnerAddress][tokenAddress].push(tokenId);
-        });
-        return tokenIdsByOwner;
-    }
-    public getTokenOwnerAddresses(): string[] {
-        return this._tokenOwnerAddresses;
-    }
-    public getTokenAddresses(): string[] {
-        const tokenAddresses = _.map(this._dummyTokenContracts, dummyTokenContract => dummyTokenContract.address);
-        return tokenAddresses;
-    }
-    private _getTokenContractFromAssetData(tokenAddress: string): DummyERC721TokenContract {
-        const tokenContractIfExists = _.find(this._dummyTokenContracts, c => c.address === tokenAddress);
-        if (_.isUndefined(tokenContractIfExists)) {
-            throw new Error(`Token: ${tokenAddress} was not deployed through ERC20Wrapper`);
-        }
-        return tokenContractIfExists;
-    }
-    private _validateDummyTokenContractsExistOrThrow(): void {
-        if (_.isUndefined(this._dummyTokenContracts)) {
-            throw new Error('Dummy ERC721 tokens not yet deployed, please call "deployDummyTokensAsync"');
-        }
-    }
-    private _validateProxyContractExistsOrThrow(): void {
-        if (_.isUndefined(this._proxyContract)) {
-            throw new Error('ERC721 proxy contract not yet deployed, please call "deployProxyAsync"');
-        }
-    }
-    private _validateBalancesAndAllowancesSetOrThrow(): void {
-        if (_.keys(this._initialTokenIdsByOwner).length === 0) {
-            throw new Error(
-                'Dummy ERC721 balances and allowances not yet set, please call "setBalancesAndAllowancesAsync"',
-            );
-        }
-    }
-}
diff --git a/packages/contracts/src/utils/exchange_wrapper.ts b/packages/contracts/src/utils/exchange_wrapper.ts
deleted file mode 100644
index baf967065..000000000
--- a/packages/contracts/src/utils/exchange_wrapper.ts
+++ /dev/null
@@ -1,242 +0,0 @@
-import { SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
-
-import { ExchangeContract } from '../generated_contract_wrappers/exchange';
-
-import { formatters } from './formatters';
-import { LogDecoder } from './log_decoder';
-import { orderUtils } from './order_utils';
-import { OrderInfo, SignedTransaction } from './types';
-
-export class ExchangeWrapper {
-    private _exchange: ExchangeContract;
-    private _web3Wrapper: Web3Wrapper;
-    private _logDecoder: LogDecoder;
-    constructor(exchangeContract: ExchangeContract, provider: Provider) {
-        this._exchange = exchangeContract;
-        this._web3Wrapper = new Web3Wrapper(provider);
-        this._logDecoder = new LogDecoder(this._web3Wrapper, this._exchange.address);
-    }
-    public async fillOrderAsync(
-        signedOrder: SignedOrder,
-        from: string,
-        opts: { takerAssetFillAmount?: BigNumber } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const txHash = await this._exchange.fillOrder.sendTransactionAsync(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-            { from },
-        );
-        const txReceipt = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return txReceipt;
-    }
-    public async cancelOrderAsync(signedOrder: SignedOrder, from: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createCancel(signedOrder);
-        const txHash = await this._exchange.cancelOrder.sendTransactionAsync(params.order, { from });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async fillOrKillOrderAsync(
-        signedOrder: SignedOrder,
-        from: string,
-        opts: { takerAssetFillAmount?: BigNumber } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const txHash = await this._exchange.fillOrKillOrder.sendTransactionAsync(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-            { from },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async fillOrderNoThrowAsync(
-        signedOrder: SignedOrder,
-        from: string,
-        opts: { takerAssetFillAmount?: BigNumber; gas?: number } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createFill(signedOrder, opts.takerAssetFillAmount);
-        const txHash = await this._exchange.fillOrderNoThrow.sendTransactionAsync(
-            params.order,
-            params.takerAssetFillAmount,
-            params.signature,
-            { from, gas: opts.gas },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async batchFillOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmounts?: BigNumber[] } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchFill(orders, opts.takerAssetFillAmounts);
-        const txHash = await this._exchange.batchFillOrders.sendTransactionAsync(
-            params.orders,
-            params.takerAssetFillAmounts,
-            params.signatures,
-            { from },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async batchFillOrKillOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmounts?: BigNumber[] } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchFill(orders, opts.takerAssetFillAmounts);
-        const txHash = await this._exchange.batchFillOrKillOrders.sendTransactionAsync(
-            params.orders,
-            params.takerAssetFillAmounts,
-            params.signatures,
-            { from },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async batchFillOrdersNoThrowAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmounts?: BigNumber[]; gas?: number } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchFill(orders, opts.takerAssetFillAmounts);
-        const txHash = await this._exchange.batchFillOrdersNoThrow.sendTransactionAsync(
-            params.orders,
-            params.takerAssetFillAmounts,
-            params.signatures,
-            { from, gas: opts.gas },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async marketSellOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmount: BigNumber },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketSellOrders(orders, opts.takerAssetFillAmount);
-        const txHash = await this._exchange.marketSellOrders.sendTransactionAsync(
-            params.orders,
-            params.takerAssetFillAmount,
-            params.signatures,
-            { from },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async marketSellOrdersNoThrowAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { takerAssetFillAmount: BigNumber; gas?: number },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketSellOrders(orders, opts.takerAssetFillAmount);
-        const txHash = await this._exchange.marketSellOrdersNoThrow.sendTransactionAsync(
-            params.orders,
-            params.takerAssetFillAmount,
-            params.signatures,
-            { from, gas: opts.gas },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async marketBuyOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { makerAssetFillAmount: BigNumber },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketBuyOrders(orders, opts.makerAssetFillAmount);
-        const txHash = await this._exchange.marketBuyOrders.sendTransactionAsync(
-            params.orders,
-            params.makerAssetFillAmount,
-            params.signatures,
-            { from },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async marketBuyOrdersNoThrowAsync(
-        orders: SignedOrder[],
-        from: string,
-        opts: { makerAssetFillAmount: BigNumber; gas?: number },
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createMarketBuyOrders(orders, opts.makerAssetFillAmount);
-        const txHash = await this._exchange.marketBuyOrdersNoThrow.sendTransactionAsync(
-            params.orders,
-            params.makerAssetFillAmount,
-            params.signatures,
-            { from, gas: opts.gas },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async batchCancelOrdersAsync(
-        orders: SignedOrder[],
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = formatters.createBatchCancel(orders);
-        const txHash = await this._exchange.batchCancelOrders.sendTransactionAsync(params.orders, { from });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async cancelOrdersUpToAsync(salt: BigNumber, from: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const txHash = await this._exchange.cancelOrdersUpTo.sendTransactionAsync(salt, { from });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async registerAssetProxyAsync(
-        assetProxyAddress: string,
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const txHash = await this._exchange.registerAssetProxy.sendTransactionAsync(assetProxyAddress, { from });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async executeTransactionAsync(
-        signedTx: SignedTransaction,
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const txHash = await this._exchange.executeTransaction.sendTransactionAsync(
-            signedTx.salt,
-            signedTx.signerAddress,
-            signedTx.data,
-            signedTx.signature,
-            { from },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async getTakerAssetFilledAmountAsync(orderHashHex: string): Promise<BigNumber> {
-        const filledAmount = new BigNumber(await this._exchange.filled.callAsync(orderHashHex));
-        return filledAmount;
-    }
-    public async isCancelledAsync(orderHashHex: string): Promise<boolean> {
-        const isCancelled = await this._exchange.cancelled.callAsync(orderHashHex);
-        return isCancelled;
-    }
-    public async getOrderInfoAsync(signedOrder: SignedOrder): Promise<OrderInfo> {
-        const orderInfo = (await this._exchange.getOrderInfo.callAsync(signedOrder)) as OrderInfo;
-        return orderInfo;
-    }
-    public async matchOrdersAsync(
-        signedOrderLeft: SignedOrder,
-        signedOrderRight: SignedOrder,
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = orderUtils.createMatchOrders(signedOrderLeft, signedOrderRight);
-        const txHash = await this._exchange.matchOrders.sendTransactionAsync(
-            params.left,
-            params.right,
-            params.leftSignature,
-            params.rightSignature,
-            { from },
-        );
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-}
diff --git a/packages/contracts/src/utils/formatters.ts b/packages/contracts/src/utils/formatters.ts
deleted file mode 100644
index 32e4787d6..000000000
--- a/packages/contracts/src/utils/formatters.ts
+++ /dev/null
@@ -1,68 +0,0 @@
-import { SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import * as _ from 'lodash';
-
-import { constants } from './constants';
-import { orderUtils } from './order_utils';
-import { BatchCancelOrders, BatchFillOrders, MarketBuyOrders, MarketSellOrders } from './types';
-
-export const formatters = {
-    createBatchFill(signedOrders: SignedOrder[], takerAssetFillAmounts: BigNumber[] = []): BatchFillOrders {
-        const batchFill: BatchFillOrders = {
-            orders: [],
-            signatures: [],
-            takerAssetFillAmounts,
-        };
-        _.forEach(signedOrders, signedOrder => {
-            const orderWithoutExchangeAddress = orderUtils.getOrderWithoutExchangeAddress(signedOrder);
-            batchFill.orders.push(orderWithoutExchangeAddress);
-            batchFill.signatures.push(signedOrder.signature);
-            if (takerAssetFillAmounts.length < signedOrders.length) {
-                batchFill.takerAssetFillAmounts.push(signedOrder.takerAssetAmount);
-            }
-        });
-        return batchFill;
-    },
-    createMarketSellOrders(signedOrders: SignedOrder[], takerAssetFillAmount: BigNumber): MarketSellOrders {
-        const marketSellOrders: MarketSellOrders = {
-            orders: [],
-            signatures: [],
-            takerAssetFillAmount,
-        };
-        _.forEach(signedOrders, (signedOrder, i) => {
-            const orderWithoutExchangeAddress = orderUtils.getOrderWithoutExchangeAddress(signedOrder);
-            if (i !== 0) {
-                orderWithoutExchangeAddress.takerAssetData = constants.NULL_BYTES;
-            }
-            marketSellOrders.orders.push(orderWithoutExchangeAddress);
-            marketSellOrders.signatures.push(signedOrder.signature);
-        });
-        return marketSellOrders;
-    },
-    createMarketBuyOrders(signedOrders: SignedOrder[], makerAssetFillAmount: BigNumber): MarketBuyOrders {
-        const marketBuyOrders: MarketBuyOrders = {
-            orders: [],
-            signatures: [],
-            makerAssetFillAmount,
-        };
-        _.forEach(signedOrders, (signedOrder, i) => {
-            const orderWithoutExchangeAddress = orderUtils.getOrderWithoutExchangeAddress(signedOrder);
-            if (i !== 0) {
-                orderWithoutExchangeAddress.makerAssetData = constants.NULL_BYTES;
-            }
-            marketBuyOrders.orders.push(orderWithoutExchangeAddress);
-            marketBuyOrders.signatures.push(signedOrder.signature);
-        });
-        return marketBuyOrders;
-    },
-    createBatchCancel(signedOrders: SignedOrder[]): BatchCancelOrders {
-        const batchCancel: BatchCancelOrders = {
-            orders: [],
-        };
-        _.forEach(signedOrders, signedOrder => {
-            const orderWithoutExchangeAddress = orderUtils.getOrderWithoutExchangeAddress(signedOrder);
-            batchCancel.orders.push(orderWithoutExchangeAddress);
-        });
-        return batchCancel;
-    },
-};
diff --git a/packages/contracts/src/utils/increase_time.ts b/packages/contracts/src/utils/increase_time.ts
deleted file mode 100644
index 4565d8dbc..000000000
--- a/packages/contracts/src/utils/increase_time.ts
+++ /dev/null
@@ -1,31 +0,0 @@
-import * as _ from 'lodash';
-
-import { constants } from './constants';
-import { web3Wrapper } from './web3_wrapper';
-
-let firstAccount: string | undefined;
-
-/**
- * Increases time by the given number of seconds and then mines a block so that
- * the current block timestamp has the offset applied.
- * @param seconds the number of seconds by which to incrase the time offset.
- * @returns a new Promise which will resolve with the new total time offset or
- * reject if the time could not be increased.
- */
-export async function increaseTimeAndMineBlockAsync(seconds: number): Promise<number> {
-    if (_.isUndefined(firstAccount)) {
-        const accounts = await web3Wrapper.getAvailableAddressesAsync();
-        firstAccount = accounts[0];
-    }
-
-    const offset = await web3Wrapper.increaseTimeAsync(seconds);
-    // Note: we need to send a transaction after increasing time so
-    // that a block is actually mined. The contract looks at the
-    // last mined block for the timestamp.
-    await web3Wrapper.awaitTransactionSuccessAsync(
-        await web3Wrapper.sendTransactionAsync({ from: firstAccount, to: firstAccount, value: 0 }),
-        constants.AWAIT_TRANSACTION_MINED_MS,
-    );
-
-    return offset;
-}
diff --git a/packages/contracts/src/utils/log_decoder.ts b/packages/contracts/src/utils/log_decoder.ts
deleted file mode 100644
index 07127ba79..000000000
--- a/packages/contracts/src/utils/log_decoder.ts
+++ /dev/null
@@ -1,55 +0,0 @@
-import { ContractArtifact } from '@0xproject/sol-compiler';
-import { AbiDecoder, BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import {
-    AbiDefinition,
-    DecodedLogArgs,
-    LogEntry,
-    LogWithDecodedArgs,
-    RawLog,
-    TransactionReceiptWithDecodedLogs,
-} from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { artifacts } from './artifacts';
-import { constants } from './constants';
-
-export class LogDecoder {
-    private _web3Wrapper: Web3Wrapper;
-    private _contractAddress: string;
-    private _abiDecoder: AbiDecoder;
-    public static wrapLogBigNumbers(log: any): any {
-        const argNames = _.keys(log.args);
-        for (const argName of argNames) {
-            const isWeb3BigNumber = _.startsWith(log.args[argName].constructor.toString(), 'function BigNumber(');
-            if (isWeb3BigNumber) {
-                log.args[argName] = new BigNumber(log.args[argName]);
-            }
-        }
-    }
-    constructor(web3Wrapper: Web3Wrapper, contractAddress: string) {
-        this._web3Wrapper = web3Wrapper;
-        this._contractAddress = contractAddress;
-        const abiArrays: AbiDefinition[][] = [];
-        _.forEach(artifacts, (artifact: ContractArtifact) => {
-            const compilerOutput = artifact.compilerOutput;
-            abiArrays.push(compilerOutput.abi);
-        });
-        this._abiDecoder = new AbiDecoder(abiArrays);
-    }
-    public decodeLogOrThrow<ArgsType extends DecodedLogArgs>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
-        const logWithDecodedArgsOrLog = this._abiDecoder.tryToDecodeLogOrNoop(log);
-        // tslint:disable-next-line:no-unnecessary-type-assertion
-        if (_.isUndefined((logWithDecodedArgsOrLog as LogWithDecodedArgs<ArgsType>).args)) {
-            throw new Error(`Unable to decode log: ${JSON.stringify(log)}`);
-        }
-        LogDecoder.wrapLogBigNumbers(logWithDecodedArgsOrLog);
-        return logWithDecodedArgsOrLog;
-    }
-    public async getTxWithDecodedLogsAsync(txHash: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const tx = await this._web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
-        tx.logs = _.filter(tx.logs, log => log.address === this._contractAddress);
-        tx.logs = _.map(tx.logs, log => this.decodeLogOrThrow(log));
-        return tx;
-    }
-}
diff --git a/packages/contracts/src/utils/match_order_tester.ts b/packages/contracts/src/utils/match_order_tester.ts
deleted file mode 100644
index fbb1b99db..000000000
--- a/packages/contracts/src/utils/match_order_tester.ts
+++ /dev/null
@@ -1,330 +0,0 @@
-import { assetProxyUtils, orderHashUtils } from '@0xproject/order-utils';
-import { AssetProxyId, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import * as chai from 'chai';
-import * as _ from 'lodash';
-
-import { chaiSetup } from '../utils/chai_setup';
-import { ERC20Wrapper } from '../utils/erc20_wrapper';
-import { ERC721Wrapper } from '../utils/erc721_wrapper';
-import { ExchangeWrapper } from '../utils/exchange_wrapper';
-import {
-    ERC20BalancesByOwner,
-    ERC721TokenIdsByOwner,
-    TransferAmountsByMatchOrders as TransferAmounts,
-} from '../utils/types';
-
-chaiSetup.configure();
-const expect = chai.expect;
-
-export class MatchOrderTester {
-    private _exchangeWrapper: ExchangeWrapper;
-    private _erc20Wrapper: ERC20Wrapper;
-    private _erc721Wrapper: ERC721Wrapper;
-    private _feeTokenAddress: string;
-
-    /// @dev Compares a pair of ERC20 balances and a pair of ERC721 token owners.
-    /// @param expectedNewERC20BalancesByOwner Expected ERC20 balances.
-    /// @param realERC20BalancesByOwner Actual ERC20 balances.
-    /// @param expectedNewERC721TokenIdsByOwner Expected ERC721 token owners.
-    /// @param realERC721TokenIdsByOwner Actual ERC20 token owners.
-    /// @return True only if ERC20 balances match and ERC721 token owners match.
-    private static _compareExpectedAndRealBalances(
-        expectedNewERC20BalancesByOwner: ERC20BalancesByOwner,
-        realERC20BalancesByOwner: ERC20BalancesByOwner,
-        expectedNewERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
-        realERC721TokenIdsByOwner: ERC721TokenIdsByOwner,
-    ): boolean {
-        // ERC20 Balances
-        const doesErc20BalancesMatch = _.isEqual(expectedNewERC20BalancesByOwner, realERC20BalancesByOwner);
-        if (!doesErc20BalancesMatch) {
-            return false;
-        }
-        // ERC721 Token Ids
-        const sortedExpectedNewERC721TokenIdsByOwner = _.mapValues(
-            expectedNewERC721TokenIdsByOwner,
-            tokenIdsByOwner => {
-                _.mapValues(tokenIdsByOwner, tokenIds => {
-                    _.sortBy(tokenIds);
-                });
-            },
-        );
-        const sortedNewERC721TokenIdsByOwner = _.mapValues(realERC721TokenIdsByOwner, tokenIdsByOwner => {
-            _.mapValues(tokenIdsByOwner, tokenIds => {
-                _.sortBy(tokenIds);
-            });
-        });
-        const doesErc721TokenIdsMatch = _.isEqual(
-            sortedExpectedNewERC721TokenIdsByOwner,
-            sortedNewERC721TokenIdsByOwner,
-        );
-        return doesErc721TokenIdsMatch;
-    }
-    /// @dev Constructs new MatchOrderTester.
-    /// @param exchangeWrapper Used to call to the Exchange.
-    /// @param erc20Wrapper Used to fetch ERC20 balances.
-    /// @param erc721Wrapper Used to fetch ERC721 token owners.
-    /// @param feeTokenAddress Address of ERC20 fee token.
-    constructor(
-        exchangeWrapper: ExchangeWrapper,
-        erc20Wrapper: ERC20Wrapper,
-        erc721Wrapper: ERC721Wrapper,
-        feeTokenAddress: string,
-    ) {
-        this._exchangeWrapper = exchangeWrapper;
-        this._erc20Wrapper = erc20Wrapper;
-        this._erc721Wrapper = erc721Wrapper;
-        this._feeTokenAddress = feeTokenAddress;
-    }
-    /// @dev Matches two complementary orders and validates results.
-    ///      Validation either succeeds or throws.
-    /// @param signedOrderLeft First matched order.
-    /// @param signedOrderRight Second matched order.
-    /// @param takerAddress Address of taker (the address who matched the two orders)
-    /// @param erc20BalancesByOwner Current ERC20 balances.
-    /// @param erc721TokenIdsByOwner Current ERC721 token owners.
-    /// @param initialTakerAssetFilledAmountLeft Current amount the left order has been filled.
-    /// @param initialTakerAssetFilledAmountRight Current amount the right order has been filled.
-    /// @return New ERC20 balances & ERC721 token owners.
-    public async matchOrdersAndVerifyBalancesAsync(
-        signedOrderLeft: SignedOrder,
-        signedOrderRight: SignedOrder,
-        takerAddress: string,
-        erc20BalancesByOwner: ERC20BalancesByOwner,
-        erc721TokenIdsByOwner: ERC721TokenIdsByOwner,
-        initialTakerAssetFilledAmountLeft?: BigNumber,
-        initialTakerAssetFilledAmountRight?: BigNumber,
-    ): Promise<[ERC20BalancesByOwner, ERC721TokenIdsByOwner]> {
-        // Verify Left order preconditions
-        const orderTakerAssetFilledAmountLeft = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderHashUtils.getOrderHashHex(signedOrderLeft),
-        );
-        const expectedOrderFilledAmountLeft = initialTakerAssetFilledAmountLeft
-            ? initialTakerAssetFilledAmountLeft
-            : new BigNumber(0);
-        expect(expectedOrderFilledAmountLeft).to.be.bignumber.equal(orderTakerAssetFilledAmountLeft);
-        // Verify Right order preconditions
-        const orderTakerAssetFilledAmountRight = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderHashUtils.getOrderHashHex(signedOrderRight),
-        );
-        const expectedOrderFilledAmountRight = initialTakerAssetFilledAmountRight
-            ? initialTakerAssetFilledAmountRight
-            : new BigNumber(0);
-        expect(expectedOrderFilledAmountRight).to.be.bignumber.equal(orderTakerAssetFilledAmountRight);
-        // Match left & right orders
-        await this._exchangeWrapper.matchOrdersAsync(signedOrderLeft, signedOrderRight, takerAddress);
-        const newERC20BalancesByOwner = await this._erc20Wrapper.getBalancesAsync();
-        const newERC721TokenIdsByOwner = await this._erc721Wrapper.getBalancesAsync();
-        // Calculate expected balance changes
-        const expectedTransferAmounts = await this._calculateExpectedTransferAmountsAsync(
-            signedOrderLeft,
-            signedOrderRight,
-            orderTakerAssetFilledAmountLeft,
-            orderTakerAssetFilledAmountRight,
-        );
-        let expectedERC20BalancesByOwner: ERC20BalancesByOwner;
-        let expectedERC721TokenIdsByOwner: ERC721TokenIdsByOwner;
-        [expectedERC20BalancesByOwner, expectedERC721TokenIdsByOwner] = this._calculateExpectedBalances(
-            signedOrderLeft,
-            signedOrderRight,
-            takerAddress,
-            erc20BalancesByOwner,
-            erc721TokenIdsByOwner,
-            expectedTransferAmounts,
-        );
-        // Assert our expected balances are equal to the actual balances
-        const didExpectedBalancesMatchRealBalances = MatchOrderTester._compareExpectedAndRealBalances(
-            expectedERC20BalancesByOwner,
-            newERC20BalancesByOwner,
-            expectedERC721TokenIdsByOwner,
-            newERC721TokenIdsByOwner,
-        );
-        expect(didExpectedBalancesMatchRealBalances).to.be.true();
-        return [newERC20BalancesByOwner, newERC721TokenIdsByOwner];
-    }
-    /// @dev Calculates expected transfer amounts between order makers, fee recipients, and
-    ///      the taker when two orders are matched.
-    /// @param signedOrderLeft First matched order.
-    /// @param signedOrderRight Second matched order.
-    /// @param orderTakerAssetFilledAmountLeft How much left order has been filled, prior to matching orders.
-    /// @param orderTakerAssetFilledAmountRight How much the right order has been filled, prior to matching orders.
-    /// @return TransferAmounts A struct containing the expected transfer amounts.
-    private async _calculateExpectedTransferAmountsAsync(
-        signedOrderLeft: SignedOrder,
-        signedOrderRight: SignedOrder,
-        orderTakerAssetFilledAmountLeft: BigNumber,
-        orderTakerAssetFilledAmountRight: BigNumber,
-    ): Promise<TransferAmounts> {
-        let amountBoughtByLeftMaker = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderHashUtils.getOrderHashHex(signedOrderLeft),
-        );
-        amountBoughtByLeftMaker = amountBoughtByLeftMaker.minus(orderTakerAssetFilledAmountLeft);
-        const amountSoldByLeftMaker = amountBoughtByLeftMaker
-            .times(signedOrderLeft.makerAssetAmount)
-            .dividedToIntegerBy(signedOrderLeft.takerAssetAmount);
-        const amountReceivedByRightMaker = amountBoughtByLeftMaker
-            .times(signedOrderRight.takerAssetAmount)
-            .dividedToIntegerBy(signedOrderRight.makerAssetAmount);
-        const amountReceivedByTaker = amountSoldByLeftMaker.minus(amountReceivedByRightMaker);
-        let amountBoughtByRightMaker = await this._exchangeWrapper.getTakerAssetFilledAmountAsync(
-            orderHashUtils.getOrderHashHex(signedOrderRight),
-        );
-        amountBoughtByRightMaker = amountBoughtByRightMaker.minus(orderTakerAssetFilledAmountRight);
-        const amountSoldByRightMaker = amountBoughtByRightMaker
-            .times(signedOrderRight.makerAssetAmount)
-            .dividedToIntegerBy(signedOrderRight.takerAssetAmount);
-        const amountReceivedByLeftMaker = amountSoldByRightMaker;
-        const feePaidByLeftMaker = signedOrderLeft.makerFee
-            .times(amountSoldByLeftMaker)
-            .dividedToIntegerBy(signedOrderLeft.makerAssetAmount);
-        const feePaidByRightMaker = signedOrderRight.makerFee
-            .times(amountSoldByRightMaker)
-            .dividedToIntegerBy(signedOrderRight.makerAssetAmount);
-        const feePaidByTakerLeft = signedOrderLeft.takerFee
-            .times(amountSoldByLeftMaker)
-            .dividedToIntegerBy(signedOrderLeft.makerAssetAmount);
-        const feePaidByTakerRight = signedOrderRight.takerFee
-            .times(amountSoldByRightMaker)
-            .dividedToIntegerBy(signedOrderRight.makerAssetAmount);
-        const totalFeePaidByTaker = feePaidByTakerLeft.add(feePaidByTakerRight);
-        const feeReceivedLeft = feePaidByLeftMaker.add(feePaidByTakerLeft);
-        const feeReceivedRight = feePaidByRightMaker.add(feePaidByTakerRight);
-        // Return values
-        const expectedTransferAmounts = {
-            // Left Maker
-            amountBoughtByLeftMaker,
-            amountSoldByLeftMaker,
-            amountReceivedByLeftMaker,
-            feePaidByLeftMaker,
-            // Right Maker
-            amountBoughtByRightMaker,
-            amountSoldByRightMaker,
-            amountReceivedByRightMaker,
-            feePaidByRightMaker,
-            // Taker
-            amountReceivedByTaker,
-            feePaidByTakerLeft,
-            feePaidByTakerRight,
-            totalFeePaidByTaker,
-            // Fee Recipients
-            feeReceivedLeft,
-            feeReceivedRight,
-        };
-        return expectedTransferAmounts;
-    }
-    /// @dev Calculates the expected balances of order makers, fee recipients, and the taker,
-    ///      as a result of matching two orders.
-    /// @param signedOrderLeft First matched order.
-    /// @param signedOrderRight Second matched order.
-    /// @param takerAddress Address of taker (the address who matched the two orders)
-    /// @param erc20BalancesByOwner Current ERC20 balances.
-    /// @param erc721TokenIdsByOwner Current ERC721 token owners.
-    /// @param expectedTransferAmounts A struct containing the expected transfer amounts.
-    /// @return Expected ERC20 balances & ERC721 token owners after orders have been matched.
-    private _calculateExpectedBalances(
-        signedOrderLeft: SignedOrder,
-        signedOrderRight: SignedOrder,
-        takerAddress: string,
-        erc20BalancesByOwner: ERC20BalancesByOwner,
-        erc721TokenIdsByOwner: ERC721TokenIdsByOwner,
-        expectedTransferAmounts: TransferAmounts,
-    ): [ERC20BalancesByOwner, ERC721TokenIdsByOwner] {
-        const makerAddressLeft = signedOrderLeft.makerAddress;
-        const makerAddressRight = signedOrderRight.makerAddress;
-        const feeRecipientAddressLeft = signedOrderLeft.feeRecipientAddress;
-        const feeRecipientAddressRight = signedOrderRight.feeRecipientAddress;
-        // Operations are performed on copies of the balances
-        const expectedNewERC20BalancesByOwner = _.cloneDeep(erc20BalancesByOwner);
-        const expectedNewERC721TokenIdsByOwner = _.cloneDeep(erc721TokenIdsByOwner);
-        // Left Maker Asset (Right Taker Asset)
-        const makerAssetProxyIdLeft = assetProxyUtils.decodeAssetDataId(signedOrderLeft.makerAssetData);
-        if (makerAssetProxyIdLeft === AssetProxyId.ERC20) {
-            // Decode asset data
-            const erc20AssetData = assetProxyUtils.decodeERC20AssetData(signedOrderLeft.makerAssetData);
-            const makerAssetAddressLeft = erc20AssetData.tokenAddress;
-            const takerAssetAddressRight = makerAssetAddressLeft;
-            // Left Maker
-            expectedNewERC20BalancesByOwner[makerAddressLeft][makerAssetAddressLeft] = expectedNewERC20BalancesByOwner[
-                makerAddressLeft
-            ][makerAssetAddressLeft].minus(expectedTransferAmounts.amountSoldByLeftMaker);
-            // Right Maker
-            expectedNewERC20BalancesByOwner[makerAddressRight][
-                takerAssetAddressRight
-            ] = expectedNewERC20BalancesByOwner[makerAddressRight][takerAssetAddressRight].add(
-                expectedTransferAmounts.amountReceivedByRightMaker,
-            );
-            // Taker
-            expectedNewERC20BalancesByOwner[takerAddress][makerAssetAddressLeft] = expectedNewERC20BalancesByOwner[
-                takerAddress
-            ][makerAssetAddressLeft].add(expectedTransferAmounts.amountReceivedByTaker);
-        } else if (makerAssetProxyIdLeft === AssetProxyId.ERC721) {
-            // Decode asset data
-            const erc721AssetData = assetProxyUtils.decodeERC721AssetData(signedOrderLeft.makerAssetData);
-            const makerAssetAddressLeft = erc721AssetData.tokenAddress;
-            const makerAssetIdLeft = erc721AssetData.tokenId;
-            const takerAssetAddressRight = makerAssetAddressLeft;
-            const takerAssetIdRight = makerAssetIdLeft;
-            // Left Maker
-            _.remove(expectedNewERC721TokenIdsByOwner[makerAddressLeft][makerAssetAddressLeft], makerAssetIdLeft);
-            // Right Maker
-            expectedNewERC721TokenIdsByOwner[makerAddressRight][takerAssetAddressRight].push(takerAssetIdRight);
-            // Taker: Since there is only 1 asset transferred, the taker does not receive any of the left maker asset.
-        }
-        // Left Taker Asset (Right Maker Asset)
-        // Note: This exchange is only between the order makers: the Taker does not receive any of the left taker asset.
-        const takerAssetProxyIdLeft = assetProxyUtils.decodeAssetDataId(signedOrderLeft.takerAssetData);
-        if (takerAssetProxyIdLeft === AssetProxyId.ERC20) {
-            // Decode asset data
-            const erc20AssetData = assetProxyUtils.decodeERC20AssetData(signedOrderLeft.takerAssetData);
-            const takerAssetAddressLeft = erc20AssetData.tokenAddress;
-            const makerAssetAddressRight = takerAssetAddressLeft;
-            // Left Maker
-            expectedNewERC20BalancesByOwner[makerAddressLeft][takerAssetAddressLeft] = expectedNewERC20BalancesByOwner[
-                makerAddressLeft
-            ][takerAssetAddressLeft].add(expectedTransferAmounts.amountReceivedByLeftMaker);
-            // Right Maker
-            expectedNewERC20BalancesByOwner[makerAddressRight][
-                makerAssetAddressRight
-            ] = expectedNewERC20BalancesByOwner[makerAddressRight][makerAssetAddressRight].minus(
-                expectedTransferAmounts.amountSoldByRightMaker,
-            );
-        } else if (takerAssetProxyIdLeft === AssetProxyId.ERC721) {
-            // Decode asset data
-            const erc721AssetData = assetProxyUtils.decodeERC721AssetData(signedOrderRight.makerAssetData);
-            const makerAssetAddressRight = erc721AssetData.tokenAddress;
-            const makerAssetIdRight = erc721AssetData.tokenId;
-            const takerAssetAddressLeft = makerAssetAddressRight;
-            const takerAssetIdLeft = makerAssetIdRight;
-            // Right Maker
-            _.remove(expectedNewERC721TokenIdsByOwner[makerAddressRight][makerAssetAddressRight], makerAssetIdRight);
-            // Left Maker
-            expectedNewERC721TokenIdsByOwner[makerAddressLeft][takerAssetAddressLeft].push(takerAssetIdLeft);
-        }
-        // Left Maker Fees
-        expectedNewERC20BalancesByOwner[makerAddressLeft][this._feeTokenAddress] = expectedNewERC20BalancesByOwner[
-            makerAddressLeft
-        ][this._feeTokenAddress].minus(expectedTransferAmounts.feePaidByLeftMaker);
-        // Right Maker Fees
-        expectedNewERC20BalancesByOwner[makerAddressRight][this._feeTokenAddress] = expectedNewERC20BalancesByOwner[
-            makerAddressRight
-        ][this._feeTokenAddress].minus(expectedTransferAmounts.feePaidByRightMaker);
-        // Taker Fees
-        expectedNewERC20BalancesByOwner[takerAddress][this._feeTokenAddress] = expectedNewERC20BalancesByOwner[
-            takerAddress
-        ][this._feeTokenAddress].minus(expectedTransferAmounts.totalFeePaidByTaker);
-        // Left Fee Recipient Fees
-        expectedNewERC20BalancesByOwner[feeRecipientAddressLeft][
-            this._feeTokenAddress
-        ] = expectedNewERC20BalancesByOwner[feeRecipientAddressLeft][this._feeTokenAddress].add(
-            expectedTransferAmounts.feeReceivedLeft,
-        );
-        // Right Fee Recipient Fees
-        expectedNewERC20BalancesByOwner[feeRecipientAddressRight][
-            this._feeTokenAddress
-        ] = expectedNewERC20BalancesByOwner[feeRecipientAddressRight][this._feeTokenAddress].add(
-            expectedTransferAmounts.feeReceivedRight,
-        );
-
-        return [expectedNewERC20BalancesByOwner, expectedNewERC721TokenIdsByOwner];
-    }
-}
diff --git a/packages/contracts/src/utils/multi_sig_wrapper.ts b/packages/contracts/src/utils/multi_sig_wrapper.ts
deleted file mode 100644
index b0d4fa8ab..000000000
--- a/packages/contracts/src/utils/multi_sig_wrapper.ts
+++ /dev/null
@@ -1,55 +0,0 @@
-import { BigNumber } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { Provider, TransactionReceiptWithDecodedLogs } from 'ethereum-types';
-import * as _ from 'lodash';
-
-import { AssetProxyOwnerContract } from '../generated_contract_wrappers/asset_proxy_owner';
-import { MultiSigWalletContract } from '../generated_contract_wrappers/multi_sig_wallet';
-
-import { LogDecoder } from './log_decoder';
-
-export class MultiSigWrapper {
-    private _multiSig: MultiSigWalletContract;
-    private _web3Wrapper: Web3Wrapper;
-    private _logDecoder: LogDecoder;
-    constructor(multiSigContract: MultiSigWalletContract, provider: Provider) {
-        this._multiSig = multiSigContract;
-        this._web3Wrapper = new Web3Wrapper(provider);
-        this._logDecoder = new LogDecoder(this._web3Wrapper, this._multiSig.address);
-    }
-    public async submitTransactionAsync(
-        destination: string,
-        data: string,
-        from: string,
-        opts: { value?: BigNumber } = {},
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        const value = _.isUndefined(opts.value) ? new BigNumber(0) : opts.value;
-        const txHash = await this._multiSig.submitTransaction.sendTransactionAsync(destination, value, data, {
-            from,
-        });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async confirmTransactionAsync(txId: BigNumber, from: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const txHash = await this._multiSig.confirmTransaction.sendTransactionAsync(txId, { from });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async executeTransactionAsync(txId: BigNumber, from: string): Promise<TransactionReceiptWithDecodedLogs> {
-        const txHash = await this._multiSig.executeTransaction.sendTransactionAsync(txId, { from });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-    public async executeRemoveAuthorizedAddressAtIndexAsync(
-        txId: BigNumber,
-        from: string,
-    ): Promise<TransactionReceiptWithDecodedLogs> {
-        // tslint:disable-next-line:no-unnecessary-type-assertion
-        const txHash = await (this
-            ._multiSig as AssetProxyOwnerContract).executeRemoveAuthorizedAddressAtIndex.sendTransactionAsync(txId, {
-            from,
-        });
-        const tx = await this._logDecoder.getTxWithDecodedLogsAsync(txHash);
-        return tx;
-    }
-}
diff --git a/packages/contracts/src/utils/order_factory.ts b/packages/contracts/src/utils/order_factory.ts
deleted file mode 100644
index 009dbc396..000000000
--- a/packages/contracts/src/utils/order_factory.ts
+++ /dev/null
@@ -1,37 +0,0 @@
-import { generatePseudoRandomSalt, orderHashUtils } from '@0xproject/order-utils';
-import { Order, SignatureType, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-
-import { constants } from './constants';
-import { signingUtils } from './signing_utils';
-
-export class OrderFactory {
-    private _defaultOrderParams: Partial<Order>;
-    private _privateKey: Buffer;
-    constructor(privateKey: Buffer, defaultOrderParams: Partial<Order>) {
-        this._defaultOrderParams = defaultOrderParams;
-        this._privateKey = privateKey;
-    }
-    public newSignedOrder(
-        customOrderParams: Partial<Order> = {},
-        signatureType: SignatureType = SignatureType.EthSign,
-    ): SignedOrder {
-        const tenMinutes = 10 * 60 * 1000;
-        const randomExpiration = new BigNumber(Date.now() + tenMinutes);
-        const order = ({
-            senderAddress: constants.NULL_ADDRESS,
-            expirationTimeSeconds: randomExpiration,
-            salt: generatePseudoRandomSalt(),
-            takerAddress: constants.NULL_ADDRESS,
-            ...this._defaultOrderParams,
-            ...customOrderParams,
-        } as any) as Order;
-        const orderHashBuff = orderHashUtils.getOrderHashBuffer(order);
-        const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType);
-        const signedOrder = {
-            ...order,
-            signature: `0x${signature.toString('hex')}`,
-        };
-        return signedOrder;
-    }
-}
diff --git a/packages/contracts/src/utils/order_factory_from_scenario.ts b/packages/contracts/src/utils/order_factory_from_scenario.ts
deleted file mode 100644
index b150e59f6..000000000
--- a/packages/contracts/src/utils/order_factory_from_scenario.ts
+++ /dev/null
@@ -1,277 +0,0 @@
-import { assetProxyUtils, generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { Order } from '@0xproject/types';
-import { BigNumber, errorUtils } from '@0xproject/utils';
-
-import { DummyERC721TokenContract } from '../generated_contract_wrappers/dummy_e_r_c721_token';
-
-import { constants } from './constants';
-import {
-    AssetDataScenario,
-    ERC721TokenIdsByOwner,
-    ExpirationTimeSecondsScenario,
-    FeeRecipientAddressScenario,
-    OrderAssetAmountScenario,
-    OrderScenario,
-    TakerScenario,
-} from './types';
-
-const TEN_UNITS_EIGHTEEN_DECIMALS = new BigNumber(10_000_000_000_000_000_000);
-const FIVE_UNITS_EIGHTEEN_DECIMALS = new BigNumber(5_000_000_000_000_000_000);
-const POINT_ONE_UNITS_EIGHTEEN_DECIMALS = new BigNumber(100_000_000_000_000_000);
-const POINT_ZERO_FIVE_UNITS_EIGHTEEN_DECIMALS = new BigNumber(50_000_000_000_000_000);
-const TEN_UNITS_FIVE_DECIMALS = new BigNumber(1_000_000);
-const FIVE_UNITS_FIVE_DECIMALS = new BigNumber(500_000);
-const ONE_NFT_UNIT = new BigNumber(1);
-
-export class OrderFactoryFromScenario {
-    private _userAddresses: string[];
-    private _zrxAddress: string;
-    private _nonZrxERC20EighteenDecimalTokenAddresses: string[];
-    private _erc20FiveDecimalTokenAddresses: string[];
-    private _erc721Token: DummyERC721TokenContract;
-    private _erc721Balances: ERC721TokenIdsByOwner;
-    private _exchangeAddress: string;
-    constructor(
-        userAddresses: string[],
-        zrxAddress: string,
-        nonZrxERC20EighteenDecimalTokenAddresses: string[],
-        erc20FiveDecimalTokenAddresses: string[],
-        erc721Token: DummyERC721TokenContract,
-        erc721Balances: ERC721TokenIdsByOwner,
-        exchangeAddress: string,
-    ) {
-        this._userAddresses = userAddresses;
-        this._zrxAddress = zrxAddress;
-        this._nonZrxERC20EighteenDecimalTokenAddresses = nonZrxERC20EighteenDecimalTokenAddresses;
-        this._erc20FiveDecimalTokenAddresses = erc20FiveDecimalTokenAddresses;
-        this._erc721Token = erc721Token;
-        this._erc721Balances = erc721Balances;
-        this._exchangeAddress = exchangeAddress;
-    }
-    public generateOrder(orderScenario: OrderScenario): Order {
-        const makerAddress = this._userAddresses[1];
-        let takerAddress = this._userAddresses[2];
-        const erc721MakerAssetIds = this._erc721Balances[makerAddress][this._erc721Token.address];
-        const erc721TakerAssetIds = this._erc721Balances[takerAddress][this._erc721Token.address];
-        let feeRecipientAddress;
-        let makerAssetAmount;
-        let takerAssetAmount;
-        let makerFee;
-        let takerFee;
-        let expirationTimeSeconds;
-        let makerAssetData;
-        let takerAssetData;
-
-        switch (orderScenario.feeRecipientScenario) {
-            case FeeRecipientAddressScenario.BurnAddress:
-                feeRecipientAddress = constants.NULL_ADDRESS;
-                break;
-            case FeeRecipientAddressScenario.EthUserAddress:
-                feeRecipientAddress = this._userAddresses[4];
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr('FeeRecipientAddressScenario', orderScenario.feeRecipientScenario);
-        }
-
-        switch (orderScenario.makerAssetDataScenario) {
-            case AssetDataScenario.ZRXFeeToken:
-                makerAssetData = assetProxyUtils.encodeERC20AssetData(this._zrxAddress);
-                break;
-            case AssetDataScenario.ERC20NonZRXEighteenDecimals:
-                makerAssetData = assetProxyUtils.encodeERC20AssetData(
-                    this._nonZrxERC20EighteenDecimalTokenAddresses[0],
-                );
-                break;
-            case AssetDataScenario.ERC20FiveDecimals:
-                makerAssetData = assetProxyUtils.encodeERC20AssetData(this._erc20FiveDecimalTokenAddresses[0]);
-                break;
-            case AssetDataScenario.ERC721:
-                makerAssetData = assetProxyUtils.encodeERC721AssetData(
-                    this._erc721Token.address,
-                    erc721MakerAssetIds[0],
-                );
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr('AssetDataScenario', orderScenario.makerAssetDataScenario);
-        }
-
-        switch (orderScenario.takerAssetDataScenario) {
-            case AssetDataScenario.ZRXFeeToken:
-                takerAssetData = assetProxyUtils.encodeERC20AssetData(this._zrxAddress);
-                break;
-            case AssetDataScenario.ERC20NonZRXEighteenDecimals:
-                takerAssetData = assetProxyUtils.encodeERC20AssetData(
-                    this._nonZrxERC20EighteenDecimalTokenAddresses[1],
-                );
-                break;
-            case AssetDataScenario.ERC20FiveDecimals:
-                takerAssetData = assetProxyUtils.encodeERC20AssetData(this._erc20FiveDecimalTokenAddresses[1]);
-                break;
-            case AssetDataScenario.ERC721:
-                takerAssetData = assetProxyUtils.encodeERC721AssetData(
-                    this._erc721Token.address,
-                    erc721TakerAssetIds[0],
-                );
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr('AssetDataScenario', orderScenario.takerAssetDataScenario);
-        }
-
-        switch (orderScenario.makerAssetAmountScenario) {
-            case OrderAssetAmountScenario.Large:
-                switch (orderScenario.makerAssetDataScenario) {
-                    case AssetDataScenario.ZRXFeeToken:
-                    case AssetDataScenario.ERC20NonZRXEighteenDecimals:
-                        makerAssetAmount = TEN_UNITS_EIGHTEEN_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC20FiveDecimals:
-                        makerAssetAmount = TEN_UNITS_FIVE_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC721:
-                        makerAssetAmount = ONE_NFT_UNIT;
-                        break;
-                    default:
-                        throw errorUtils.spawnSwitchErr('AssetDataScenario', orderScenario.makerAssetDataScenario);
-                }
-                break;
-            case OrderAssetAmountScenario.Small:
-                switch (orderScenario.makerAssetDataScenario) {
-                    case AssetDataScenario.ZRXFeeToken:
-                    case AssetDataScenario.ERC20NonZRXEighteenDecimals:
-                        makerAssetAmount = FIVE_UNITS_EIGHTEEN_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC20FiveDecimals:
-                        makerAssetAmount = FIVE_UNITS_FIVE_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC721:
-                        makerAssetAmount = ONE_NFT_UNIT;
-                        break;
-                    default:
-                        throw errorUtils.spawnSwitchErr('AssetDataScenario', orderScenario.makerAssetDataScenario);
-                }
-                break;
-            case OrderAssetAmountScenario.Zero:
-                makerAssetAmount = new BigNumber(0);
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr('OrderAssetAmountScenario', orderScenario.makerAssetAmountScenario);
-        }
-
-        switch (orderScenario.takerAssetAmountScenario) {
-            case OrderAssetAmountScenario.Large:
-                switch (orderScenario.takerAssetDataScenario) {
-                    case AssetDataScenario.ERC20NonZRXEighteenDecimals:
-                    case AssetDataScenario.ZRXFeeToken:
-                        takerAssetAmount = TEN_UNITS_EIGHTEEN_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC20FiveDecimals:
-                        takerAssetAmount = TEN_UNITS_FIVE_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC721:
-                        takerAssetAmount = ONE_NFT_UNIT;
-                        break;
-                    default:
-                        throw errorUtils.spawnSwitchErr('AssetDataScenario', orderScenario.takerAssetDataScenario);
-                }
-                break;
-            case OrderAssetAmountScenario.Small:
-                switch (orderScenario.takerAssetDataScenario) {
-                    case AssetDataScenario.ERC20NonZRXEighteenDecimals:
-                    case AssetDataScenario.ZRXFeeToken:
-                        takerAssetAmount = FIVE_UNITS_EIGHTEEN_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC20FiveDecimals:
-                        takerAssetAmount = FIVE_UNITS_FIVE_DECIMALS;
-                        break;
-                    case AssetDataScenario.ERC721:
-                        takerAssetAmount = ONE_NFT_UNIT;
-                        break;
-                    default:
-                        throw errorUtils.spawnSwitchErr('AssetDataScenario', orderScenario.takerAssetDataScenario);
-                }
-                break;
-            case OrderAssetAmountScenario.Zero:
-                takerAssetAmount = new BigNumber(0);
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr('OrderAssetAmountScenario', orderScenario.takerAssetAmountScenario);
-        }
-
-        switch (orderScenario.makerFeeScenario) {
-            case OrderAssetAmountScenario.Large:
-                makerFee = POINT_ONE_UNITS_EIGHTEEN_DECIMALS;
-                break;
-            case OrderAssetAmountScenario.Small:
-                makerFee = POINT_ZERO_FIVE_UNITS_EIGHTEEN_DECIMALS;
-                break;
-            case OrderAssetAmountScenario.Zero:
-                makerFee = new BigNumber(0);
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr('OrderAssetAmountScenario', orderScenario.makerFeeScenario);
-        }
-
-        switch (orderScenario.takerFeeScenario) {
-            case OrderAssetAmountScenario.Large:
-                takerFee = POINT_ONE_UNITS_EIGHTEEN_DECIMALS;
-                break;
-            case OrderAssetAmountScenario.Small:
-                takerFee = POINT_ZERO_FIVE_UNITS_EIGHTEEN_DECIMALS;
-                break;
-            case OrderAssetAmountScenario.Zero:
-                takerFee = new BigNumber(0);
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr('OrderAssetAmountScenario', orderScenario.takerFeeScenario);
-        }
-
-        switch (orderScenario.expirationTimeSecondsScenario) {
-            case ExpirationTimeSecondsScenario.InFuture:
-                expirationTimeSeconds = new BigNumber(2524604400); // Close to infinite
-                break;
-            case ExpirationTimeSecondsScenario.InPast:
-                expirationTimeSeconds = new BigNumber(0); // Jan 1, 1970
-                break;
-            default:
-                throw errorUtils.spawnSwitchErr(
-                    'ExpirationTimeSecondsScenario',
-                    orderScenario.expirationTimeSecondsScenario,
-                );
-        }
-
-        switch (orderScenario.takerScenario) {
-            case TakerScenario.CorrectlySpecified:
-                break; // noop since takerAddress is already specified
-
-            case TakerScenario.IncorrectlySpecified:
-                const notTaker = this._userAddresses[3];
-                takerAddress = notTaker;
-                break;
-
-            case TakerScenario.Unspecified:
-                takerAddress = constants.NULL_ADDRESS;
-                break;
-
-            default:
-                throw errorUtils.spawnSwitchErr('TakerScenario', orderScenario.takerScenario);
-        }
-
-        const order = {
-            senderAddress: constants.NULL_ADDRESS,
-            makerAddress,
-            takerAddress,
-            makerFee,
-            takerFee,
-            makerAssetAmount,
-            takerAssetAmount,
-            makerAssetData,
-            takerAssetData,
-            salt: generatePseudoRandomSalt(),
-            exchangeAddress: this._exchangeAddress,
-            feeRecipientAddress,
-            expirationTimeSeconds,
-        };
-
-        return order;
-    }
-}
diff --git a/packages/contracts/src/utils/order_utils.ts b/packages/contracts/src/utils/order_utils.ts
deleted file mode 100644
index 019f6e74b..000000000
--- a/packages/contracts/src/utils/order_utils.ts
+++ /dev/null
@@ -1,58 +0,0 @@
-import { OrderWithoutExchangeAddress, SignedOrder } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-
-import { constants } from './constants';
-import { CancelOrder, MatchOrder } from './types';
-
-export const orderUtils = {
-    getPartialAmount(numerator: BigNumber, denominator: BigNumber, target: BigNumber): BigNumber {
-        const partialAmount = numerator
-            .mul(target)
-            .div(denominator)
-            .floor();
-        return partialAmount;
-    },
-    createFill: (signedOrder: SignedOrder, takerAssetFillAmount?: BigNumber) => {
-        const fill = {
-            order: orderUtils.getOrderWithoutExchangeAddress(signedOrder),
-            takerAssetFillAmount: takerAssetFillAmount || signedOrder.takerAssetAmount,
-            signature: signedOrder.signature,
-        };
-        return fill;
-    },
-    createCancel(signedOrder: SignedOrder, takerAssetCancelAmount?: BigNumber): CancelOrder {
-        const cancel = {
-            order: orderUtils.getOrderWithoutExchangeAddress(signedOrder),
-            takerAssetCancelAmount: takerAssetCancelAmount || signedOrder.takerAssetAmount,
-        };
-        return cancel;
-    },
-    getOrderWithoutExchangeAddress(signedOrder: SignedOrder): OrderWithoutExchangeAddress {
-        const orderStruct = {
-            senderAddress: signedOrder.senderAddress,
-            makerAddress: signedOrder.makerAddress,
-            takerAddress: signedOrder.takerAddress,
-            feeRecipientAddress: signedOrder.feeRecipientAddress,
-            makerAssetAmount: signedOrder.makerAssetAmount,
-            takerAssetAmount: signedOrder.takerAssetAmount,
-            makerFee: signedOrder.makerFee,
-            takerFee: signedOrder.takerFee,
-            expirationTimeSeconds: signedOrder.expirationTimeSeconds,
-            salt: signedOrder.salt,
-            makerAssetData: signedOrder.makerAssetData,
-            takerAssetData: signedOrder.takerAssetData,
-        };
-        return orderStruct;
-    },
-    createMatchOrders(signedOrderLeft: SignedOrder, signedOrderRight: SignedOrder): MatchOrder {
-        const fill = {
-            left: orderUtils.getOrderWithoutExchangeAddress(signedOrderLeft),
-            right: orderUtils.getOrderWithoutExchangeAddress(signedOrderRight),
-            leftSignature: signedOrderLeft.signature,
-            rightSignature: signedOrderRight.signature,
-        };
-        fill.right.makerAssetData = constants.NULL_BYTES;
-        fill.right.takerAssetData = constants.NULL_BYTES;
-        return fill;
-    },
-};
diff --git a/packages/contracts/src/utils/profiler.ts b/packages/contracts/src/utils/profiler.ts
deleted file mode 100644
index 85ee24f22..000000000
--- a/packages/contracts/src/utils/profiler.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import { devConstants } from '@0xproject/dev-utils';
-import { ProfilerSubprovider, SolCompilerArtifactAdapter } from '@0xproject/sol-cov';
-import * as _ from 'lodash';
-
-let profilerSubprovider: ProfilerSubprovider;
-
-export const profiler = {
-    start(): void {
-        profiler.getProfilerSubproviderSingleton().start();
-    },
-    stop(): void {
-        profiler.getProfilerSubproviderSingleton().stop();
-    },
-    getProfilerSubproviderSingleton(): ProfilerSubprovider {
-        if (_.isUndefined(profilerSubprovider)) {
-            profilerSubprovider = profiler._getProfilerSubprovider();
-        }
-        return profilerSubprovider;
-    },
-    _getProfilerSubprovider(): ProfilerSubprovider {
-        const defaultFromAddress = devConstants.TESTRPC_FIRST_ADDRESS;
-        const solCompilerArtifactAdapter = new SolCompilerArtifactAdapter();
-        const isVerbose = true;
-        const subprovider = new ProfilerSubprovider(solCompilerArtifactAdapter, defaultFromAddress, isVerbose);
-        return subprovider;
-    },
-};
diff --git a/packages/contracts/src/utils/revert_trace.ts b/packages/contracts/src/utils/revert_trace.ts
deleted file mode 100644
index 0bf8384bc..000000000
--- a/packages/contracts/src/utils/revert_trace.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { devConstants } from '@0xproject/dev-utils';
-import { RevertTraceSubprovider, SolCompilerArtifactAdapter } from '@0xproject/sol-cov';
-import * as _ from 'lodash';
-
-let revertTraceSubprovider: RevertTraceSubprovider;
-
-export const revertTrace = {
-    getRevertTraceSubproviderSingleton(): RevertTraceSubprovider {
-        if (_.isUndefined(revertTraceSubprovider)) {
-            revertTraceSubprovider = revertTrace._getRevertTraceSubprovider();
-        }
-        return revertTraceSubprovider;
-    },
-    _getRevertTraceSubprovider(): RevertTraceSubprovider {
-        const defaultFromAddress = devConstants.TESTRPC_FIRST_ADDRESS;
-        const solCompilerArtifactAdapter = new SolCompilerArtifactAdapter();
-        const isVerbose = true;
-        const subprovider = new RevertTraceSubprovider(solCompilerArtifactAdapter, defaultFromAddress, isVerbose);
-        return subprovider;
-    },
-};
diff --git a/packages/contracts/src/utils/signing_utils.ts b/packages/contracts/src/utils/signing_utils.ts
deleted file mode 100644
index 9c711c72c..000000000
--- a/packages/contracts/src/utils/signing_utils.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-import { SignatureType } from '@0xproject/types';
-import * as ethUtil from 'ethereumjs-util';
-
-export const signingUtils = {
-    signMessage(message: Buffer, privateKey: Buffer, signatureType: SignatureType): Buffer {
-        if (signatureType === SignatureType.EthSign) {
-            const prefixedMessage = ethUtil.hashPersonalMessage(message);
-            const ecSignature = ethUtil.ecsign(prefixedMessage, privateKey);
-            const signature = Buffer.concat([
-                ethUtil.toBuffer(ecSignature.v),
-                ecSignature.r,
-                ecSignature.s,
-                ethUtil.toBuffer(signatureType),
-            ]);
-            return signature;
-        } else if (signatureType === SignatureType.EIP712) {
-            const ecSignature = ethUtil.ecsign(message, privateKey);
-            const signature = Buffer.concat([
-                ethUtil.toBuffer(ecSignature.v),
-                ecSignature.r,
-                ecSignature.s,
-                ethUtil.toBuffer(signatureType),
-            ]);
-            return signature;
-        } else {
-            throw new Error(`${signatureType} is not a valid signature type`);
-        }
-    },
-};
diff --git a/packages/contracts/src/utils/simple_asset_balance_and_proxy_allowance_fetcher.ts b/packages/contracts/src/utils/simple_asset_balance_and_proxy_allowance_fetcher.ts
deleted file mode 100644
index a295a40c4..000000000
--- a/packages/contracts/src/utils/simple_asset_balance_and_proxy_allowance_fetcher.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import { AbstractBalanceAndProxyAllowanceFetcher } from '@0xproject/order-utils';
-import { BigNumber } from '@0xproject/utils';
-
-import { AssetWrapper } from './asset_wrapper';
-
-export class SimpleAssetBalanceAndProxyAllowanceFetcher implements AbstractBalanceAndProxyAllowanceFetcher {
-    private _assetWrapper: AssetWrapper;
-    constructor(assetWrapper: AssetWrapper) {
-        this._assetWrapper = assetWrapper;
-    }
-    public async getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
-        const balance = await this._assetWrapper.getBalanceAsync(userAddress, assetData);
-        return balance;
-    }
-    public async getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
-        const proxyAllowance = await this._assetWrapper.getProxyAllowanceAsync(userAddress, assetData);
-        return proxyAllowance;
-    }
-}
diff --git a/packages/contracts/src/utils/simple_order_filled_cancelled_fetcher.ts b/packages/contracts/src/utils/simple_order_filled_cancelled_fetcher.ts
deleted file mode 100644
index 24afe36b7..000000000
--- a/packages/contracts/src/utils/simple_order_filled_cancelled_fetcher.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-import { AbstractOrderFilledCancelledFetcher } from '@0xproject/order-utils';
-import { BigNumber } from '@0xproject/utils';
-
-import { ExchangeWrapper } from './exchange_wrapper';
-
-export class SimpleOrderFilledCancelledFetcher implements AbstractOrderFilledCancelledFetcher {
-    private _exchangeWrapper: ExchangeWrapper;
-    private _zrxAssetData: string;
-    constructor(exchange: ExchangeWrapper, zrxAssetData: string) {
-        this._exchangeWrapper = exchange;
-        this._zrxAssetData = zrxAssetData;
-    }
-    public async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber> {
-        const filledTakerAmount = new BigNumber(await this._exchangeWrapper.getTakerAssetFilledAmountAsync(orderHash));
-        return filledTakerAmount;
-    }
-    public async isOrderCancelledAsync(orderHash: string): Promise<boolean> {
-        const isCancelled = await this._exchangeWrapper.isCancelledAsync(orderHash);
-        return isCancelled;
-    }
-    public getZRXAssetData(): string {
-        return this._zrxAssetData;
-    }
-}
diff --git a/packages/contracts/src/utils/token_registry_wrapper.ts b/packages/contracts/src/utils/token_registry_wrapper.ts
deleted file mode 100644
index 91895aa59..000000000
--- a/packages/contracts/src/utils/token_registry_wrapper.ts
+++ /dev/null
@@ -1,66 +0,0 @@
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import { Provider } from 'ethereum-types';
-
-import { TokenRegistryContract } from '../generated_contract_wrappers/token_registry';
-
-import { Token } from './types';
-
-import { constants } from './constants';
-
-export class TokenRegWrapper {
-    private _tokenReg: TokenRegistryContract;
-    private _web3Wrapper: Web3Wrapper;
-    constructor(tokenRegContract: TokenRegistryContract, provider: Provider) {
-        this._tokenReg = tokenRegContract;
-        this._web3Wrapper = new Web3Wrapper(provider);
-    }
-    public async addTokenAsync(token: Token, from: string): Promise<string> {
-        const txHash = await this._tokenReg.addToken.sendTransactionAsync(
-            token.address as string,
-            token.name,
-            token.symbol,
-            token.decimals,
-            token.ipfsHash,
-            token.swarmHash,
-            { from },
-        );
-        await this._web3Wrapper.awaitTransactionSuccessAsync(txHash, constants.AWAIT_TRANSACTION_MINED_MS);
-        return txHash;
-    }
-    public async getTokenMetaDataAsync(tokenAddress: string): Promise<Token> {
-        const data = await this._tokenReg.getTokenMetaData.callAsync(tokenAddress);
-        const token: Token = {
-            address: data[0],
-            name: data[1],
-            symbol: data[2],
-            decimals: data[3],
-            ipfsHash: data[4],
-            swarmHash: data[5],
-        };
-        return token;
-    }
-    public async getTokenByNameAsync(tokenName: string): Promise<Token> {
-        const data = await this._tokenReg.getTokenByName.callAsync(tokenName);
-        const token: Token = {
-            address: data[0],
-            name: data[1],
-            symbol: data[2],
-            decimals: data[3],
-            ipfsHash: data[4],
-            swarmHash: data[5],
-        };
-        return token;
-    }
-    public async getTokenBySymbolAsync(tokenSymbol: string): Promise<Token> {
-        const data = await this._tokenReg.getTokenBySymbol.callAsync(tokenSymbol);
-        const token: Token = {
-            address: data[0],
-            name: data[1],
-            symbol: data[2],
-            decimals: data[3],
-            ipfsHash: data[4],
-            swarmHash: data[5],
-        };
-        return token;
-    }
-}
diff --git a/packages/contracts/src/utils/transaction_factory.ts b/packages/contracts/src/utils/transaction_factory.ts
deleted file mode 100644
index 348c0715d..000000000
--- a/packages/contracts/src/utils/transaction_factory.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-import { EIP712Schema, EIP712Types, EIP712Utils, generatePseudoRandomSalt } from '@0xproject/order-utils';
-import { SignatureType } from '@0xproject/types';
-import * as ethUtil from 'ethereumjs-util';
-
-import { signingUtils } from './signing_utils';
-import { SignedTransaction } from './types';
-
-const EIP712_ZEROEX_TRANSACTION_SCHEMA: EIP712Schema = {
-    name: 'ZeroExTransaction',
-    parameters: [
-        { name: 'salt', type: EIP712Types.Uint256 },
-        { name: 'signerAddress', type: EIP712Types.Address },
-        { name: 'data', type: EIP712Types.Bytes },
-    ],
-};
-
-export class TransactionFactory {
-    private _signerBuff: Buffer;
-    private _exchangeAddress: string;
-    private _privateKey: Buffer;
-    constructor(privateKey: Buffer, exchangeAddress: string) {
-        this._privateKey = privateKey;
-        this._exchangeAddress = exchangeAddress;
-        this._signerBuff = ethUtil.privateToAddress(this._privateKey);
-    }
-    public newSignedTransaction(data: string, signatureType: SignatureType = SignatureType.EthSign): SignedTransaction {
-        const salt = generatePseudoRandomSalt();
-        const signerAddress = `0x${this._signerBuff.toString('hex')}`;
-        const executeTransactionData = {
-            salt,
-            signerAddress,
-            data,
-        };
-        const executeTransactionHashBuff = EIP712Utils.structHash(
-            EIP712_ZEROEX_TRANSACTION_SCHEMA,
-            executeTransactionData,
-        );
-        const txHash = EIP712Utils.createEIP712Message(executeTransactionHashBuff, this._exchangeAddress);
-        const signature = signingUtils.signMessage(txHash, this._privateKey, signatureType);
-        const signedTx = {
-            exchangeAddress: this._exchangeAddress,
-            signature: `0x${signature.toString('hex')}`,
-            ...executeTransactionData,
-        };
-        return signedTx;
-    }
-}
diff --git a/packages/contracts/src/utils/types.ts b/packages/contracts/src/utils/types.ts
deleted file mode 100644
index b792bb90a..000000000
--- a/packages/contracts/src/utils/types.ts
+++ /dev/null
@@ -1,229 +0,0 @@
-import { OrderWithoutExchangeAddress } from '@0xproject/types';
-import { BigNumber } from '@0xproject/utils';
-import { AbiDefinition } from 'ethereum-types';
-
-export interface ERC20BalancesByOwner {
-    [ownerAddress: string]: {
-        [tokenAddress: string]: BigNumber;
-    };
-}
-
-export interface ERC721TokenIdsByOwner {
-    [ownerAddress: string]: {
-        [tokenAddress: string]: BigNumber[];
-    };
-}
-
-export interface SubmissionContractEventArgs {
-    transactionId: BigNumber;
-}
-
-export interface BatchFillOrders {
-    orders: OrderWithoutExchangeAddress[];
-    signatures: string[];
-    takerAssetFillAmounts: BigNumber[];
-}
-
-export interface MarketSellOrders {
-    orders: OrderWithoutExchangeAddress[];
-    signatures: string[];
-    takerAssetFillAmount: BigNumber;
-}
-
-export interface MarketBuyOrders {
-    orders: OrderWithoutExchangeAddress[];
-    signatures: string[];
-    makerAssetFillAmount: BigNumber;
-}
-
-export interface BatchCancelOrders {
-    orders: OrderWithoutExchangeAddress[];
-}
-
-export interface CancelOrdersBefore {
-    salt: BigNumber;
-}
-
-export interface TransactionDataParams {
-    name: string;
-    abi: AbiDefinition[];
-    args: any[];
-}
-
-export interface MultiSigConfig {
-    owners: string[];
-    confirmationsRequired: number;
-    secondsRequired: number;
-}
-
-export interface MultiSigConfigByNetwork {
-    [networkName: string]: MultiSigConfig;
-}
-
-export interface Token {
-    address?: string;
-    name: string;
-    symbol: string;
-    decimals: number;
-    ipfsHash: string;
-    swarmHash: string;
-}
-
-export enum OrderStatus {
-    INVALID,
-    INVALID_MAKER_ASSET_AMOUNT,
-    INVALID_TAKER_ASSET_AMOUNT,
-    FILLABLE,
-    EXPIRED,
-    FULLY_FILLED,
-    CANCELLED,
-}
-
-export enum ContractName {
-    TokenRegistry = 'TokenRegistry',
-    MultiSigWalletWithTimeLock = 'MultiSigWalletWithTimeLock',
-    Exchange = 'Exchange',
-    ZRXToken = 'ZRXToken',
-    DummyERC20Token = 'DummyERC20Token',
-    EtherToken = 'WETH9',
-    AssetProxyOwner = 'AssetProxyOwner',
-    AccountLevels = 'AccountLevels',
-    EtherDelta = 'EtherDelta',
-    Arbitrage = 'Arbitrage',
-    TestAssetDataDecoders = 'TestAssetDataDecoders',
-    TestAssetProxyDispatcher = 'TestAssetProxyDispatcher',
-    TestLibs = 'TestLibs',
-    TestSignatureValidator = 'TestSignatureValidator',
-    ERC20Proxy = 'ERC20Proxy',
-    ERC721Proxy = 'ERC721Proxy',
-    DummyERC721Receiver = 'DummyERC721Receiver',
-    DummyERC721Token = 'DummyERC721Token',
-    TestLibBytes = 'TestLibBytes',
-    TestWallet = 'TestWallet',
-    Authorizable = 'Authorizable',
-    Whitelist = 'Whitelist',
-}
-
-export interface SignedTransaction {
-    exchangeAddress: string;
-    salt: BigNumber;
-    signerAddress: string;
-    data: string;
-    signature: string;
-}
-
-export interface TransferAmountsByMatchOrders {
-    // Left Maker
-    amountBoughtByLeftMaker: BigNumber;
-    amountSoldByLeftMaker: BigNumber;
-    amountReceivedByLeftMaker: BigNumber;
-    feePaidByLeftMaker: BigNumber;
-    // Right Maker
-    amountBoughtByRightMaker: BigNumber;
-    amountSoldByRightMaker: BigNumber;
-    amountReceivedByRightMaker: BigNumber;
-    feePaidByRightMaker: BigNumber;
-    // Taker
-    amountReceivedByTaker: BigNumber;
-    feePaidByTakerLeft: BigNumber;
-    feePaidByTakerRight: BigNumber;
-    totalFeePaidByTaker: BigNumber;
-    // Fee Recipients
-    feeReceivedLeft: BigNumber;
-    feeReceivedRight: BigNumber;
-}
-
-export interface OrderInfo {
-    orderStatus: number;
-    orderHash: string;
-    orderTakerAssetFilledAmount: BigNumber;
-}
-
-export interface CancelOrder {
-    order: OrderWithoutExchangeAddress;
-    takerAssetCancelAmount: BigNumber;
-}
-
-export interface MatchOrder {
-    left: OrderWithoutExchangeAddress;
-    right: OrderWithoutExchangeAddress;
-    leftSignature: string;
-    rightSignature: string;
-}
-
-// Combinatorial testing types
-
-export enum FeeRecipientAddressScenario {
-    BurnAddress = 'BURN_ADDRESS',
-    EthUserAddress = 'ETH_USER_ADDRESS',
-}
-
-export enum OrderAssetAmountScenario {
-    Zero = 'ZERO',
-    Large = 'LARGE',
-    Small = 'SMALL',
-}
-
-export enum TakerScenario {
-    CorrectlySpecified = 'CORRECTLY_SPECIFIED',
-    IncorrectlySpecified = 'INCORRECTLY_SPECIFIED',
-    Unspecified = 'UNSPECIFIED',
-}
-
-export enum ExpirationTimeSecondsScenario {
-    InPast = 'IN_PAST',
-    InFuture = 'IN_FUTURE',
-}
-
-export enum AssetDataScenario {
-    ERC721 = 'ERC721',
-    ZRXFeeToken = 'ZRX_FEE_TOKEN',
-    ERC20FiveDecimals = 'ERC20_FIVE_DECIMALS',
-    ERC20NonZRXEighteenDecimals = 'ERC20_NON_ZRX_EIGHTEEN_DECIMALS',
-}
-
-export enum TakerAssetFillAmountScenario {
-    Zero = 'ZERO',
-    GreaterThanRemainingFillableTakerAssetAmount = 'GREATER_THAN_REMAINING_FILLABLE_TAKER_ASSET_AMOUNT',
-    LessThanRemainingFillableTakerAssetAmount = 'LESS_THAN_REMAINING_FILLABLE_TAKER_ASSET_AMOUNT',
-    ExactlyRemainingFillableTakerAssetAmount = 'EXACTLY_REMAINING_FILLABLE_TAKER_ASSET_AMOUNT',
-}
-
-export interface OrderScenario {
-    takerScenario: TakerScenario;
-    feeRecipientScenario: FeeRecipientAddressScenario;
-    makerAssetAmountScenario: OrderAssetAmountScenario;
-    takerAssetAmountScenario: OrderAssetAmountScenario;
-    makerFeeScenario: OrderAssetAmountScenario;
-    takerFeeScenario: OrderAssetAmountScenario;
-    expirationTimeSecondsScenario: ExpirationTimeSecondsScenario;
-    makerAssetDataScenario: AssetDataScenario;
-    takerAssetDataScenario: AssetDataScenario;
-}
-
-export enum BalanceAmountScenario {
-    Exact = 'EXACT',
-    TooLow = 'TOO_LOW',
-    Higher = 'HIGHER',
-}
-
-export enum AllowanceAmountScenario {
-    Exact = 'EXACT',
-    TooLow = 'TOO_LOW',
-    Higher = 'HIGHER',
-    Unlimited = 'UNLIMITED',
-}
-
-export interface TraderStateScenario {
-    traderAssetBalance: BalanceAmountScenario;
-    traderAssetAllowance: AllowanceAmountScenario;
-    zrxFeeBalance: BalanceAmountScenario;
-    zrxFeeAllowance: AllowanceAmountScenario;
-}
-
-export interface FillScenario {
-    orderScenario: OrderScenario;
-    takerAssetFillAmountScenario: TakerAssetFillAmountScenario;
-    makerStateScenario: TraderStateScenario;
-    takerStateScenario: TraderStateScenario;
-}
diff --git a/packages/contracts/src/utils/web3_wrapper.ts b/packages/contracts/src/utils/web3_wrapper.ts
deleted file mode 100644
index c9d83a02d..000000000
--- a/packages/contracts/src/utils/web3_wrapper.ts
+++ /dev/null
@@ -1,82 +0,0 @@
-import { devConstants, env, EnvVars, web3Factory } from '@0xproject/dev-utils';
-import { prependSubprovider } from '@0xproject/subproviders';
-import { logUtils } from '@0xproject/utils';
-import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as _ from 'lodash';
-
-import { coverage } from './coverage';
-import { profiler } from './profiler';
-import { revertTrace } from './revert_trace';
-
-enum ProviderType {
-    Ganache = 'ganache',
-    Geth = 'geth',
-}
-
-let testProvider: ProviderType;
-switch (process.env.TEST_PROVIDER) {
-    case undefined:
-        testProvider = ProviderType.Ganache;
-        break;
-    case 'ganache':
-        testProvider = ProviderType.Ganache;
-        break;
-    case 'geth':
-        testProvider = ProviderType.Geth;
-        break;
-    default:
-        throw new Error(`Unknown TEST_PROVIDER: ${process.env.TEST_PROVIDER}`);
-}
-
-const ganacheTxDefaults = {
-    from: devConstants.TESTRPC_FIRST_ADDRESS,
-    gas: devConstants.GAS_LIMIT,
-};
-const gethTxDefaults = {
-    from: devConstants.TESTRPC_FIRST_ADDRESS,
-};
-export const txDefaults = testProvider === ProviderType.Ganache ? ganacheTxDefaults : gethTxDefaults;
-
-const gethConfigs = {
-    shouldUseInProcessGanache: false,
-    rpcUrl: 'http://localhost:8501',
-    shouldUseFakeGasEstimate: false,
-};
-const ganacheConfigs = {
-    shouldUseInProcessGanache: true,
-};
-const providerConfigs = testProvider === ProviderType.Ganache ? ganacheConfigs : gethConfigs;
-
-export const provider = web3Factory.getRpcProvider(providerConfigs);
-const isCoverageEnabled = env.parseBoolean(EnvVars.SolidityCoverage);
-const isProfilerEnabled = env.parseBoolean(EnvVars.SolidityProfiler);
-const isRevertTraceEnabled = env.parseBoolean(EnvVars.SolidityRevertTrace);
-const enabledSubproviderCount = _.filter([isCoverageEnabled, isProfilerEnabled, isRevertTraceEnabled], _.identity)
-    .length;
-if (enabledSubproviderCount > 1) {
-    throw new Error(`Only one of coverage, profiler, or revert trace subproviders can be enabled at a time`);
-}
-if (isCoverageEnabled) {
-    const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
-    prependSubprovider(provider, coverageSubprovider);
-}
-if (isProfilerEnabled) {
-    if (testProvider === ProviderType.Ganache) {
-        logUtils.warn(
-            "Gas costs in Ganache traces are incorrect and we don't recommend using it for profiling. Please switch to Geth",
-        );
-        process.exit(1);
-    }
-    const profilerSubprovider = profiler.getProfilerSubproviderSingleton();
-    logUtils.log(
-        "By default profilerSubprovider is stopped so that you don't get noise from setup code. Don't forget to start it before the code you want to profile and stop it afterwards",
-    );
-    profilerSubprovider.stop();
-    prependSubprovider(provider, profilerSubprovider);
-}
-if (isRevertTraceEnabled) {
-    const revertTraceSubprovider = revertTrace.getRevertTraceSubproviderSingleton();
-    prependSubprovider(provider, revertTraceSubprovider);
-}
-
-export const web3Wrapper = new Web3Wrapper(provider);