Merge branch 'development' of github.com:0xProject/0x.js into development

* 'development' of github.com:0xProject/0x.js:
  Update CHANGELOG
  0.22.4
  Add HACK comments
  Add a forgotten augmentation file
  Upgrade bignumber to the version with native typings and remove typings
  Downgrade typedoc
  Upgrade bignumber to the version with native typings and remove typings

15 files changed, 137 insertions, 118 deletions

diff --git a/src/0x.ts b/src/0x.ts
index 9f955c807..bc753434c 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -1,5 +1,5 @@
 import * as _ from 'lodash';
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 import {SchemaValidator, schemas} from '0x-json-schemas';
 import {bigNumberConfigs} from './bignumber_config';
 import * as ethUtil from 'ethereumjs-util';
@@ -100,7 +100,7 @@ export class ZeroEx {
      * and will not collide with other outstanding orders that are identical in all other parameters.
      * @return  A pseudo-random 256-bit number that can be used as a salt.
      */
-    public static generatePseudoRandomSalt(): BigNumber.BigNumber {
+    public static generatePseudoRandomSalt(): BigNumber {
         // BigNumber.random returns a pseudo-random number between 0 & 1 with a passed in number of decimal places.
         // Source: https://mikemcl.github.io/bignumber.js/#random
         const randomNumber = BigNumber.random(constants.MAX_DIGITS_IN_UNSIGNED_256_INT);
@@ -131,7 +131,7 @@ export class ZeroEx {
      * @param   decimals    The number of decimal places the unit amount has.
      * @return  The amount in units.
      */
-    public static toUnitAmount(amount: BigNumber.BigNumber, decimals: number): BigNumber.BigNumber {
+    public static toUnitAmount(amount: BigNumber, decimals: number): BigNumber {
         assert.isBigNumber('amount', amount);
         assert.isNumber('decimals', decimals);
 
@@ -147,7 +147,7 @@ export class ZeroEx {
      * @param   decimals    The number of decimal places the unit amount has.
      * @return  The amount in baseUnits.
      */
-    public static toBaseUnitAmount(amount: BigNumber.BigNumber, decimals: number): BigNumber.BigNumber {
+    public static toBaseUnitAmount(amount: BigNumber, decimals: number): BigNumber {
         assert.isBigNumber('amount', amount);
         assert.isNumber('decimals', decimals);
 
diff --git a/src/bignumber_config.ts b/src/bignumber_config.ts
index 9c1715f86..2d5214e6f 100644
--- a/src/bignumber_config.ts
+++ b/src/bignumber_config.ts
@@ -1,4 +1,4 @@
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 
 export const bigNumberConfigs = {
     configure() {
diff --git a/src/contract_wrappers/ether_token_wrapper.ts b/src/contract_wrappers/ether_token_wrapper.ts
index f15e766f0..7c94e314a 100644
--- a/src/contract_wrappers/ether_token_wrapper.ts
+++ b/src/contract_wrappers/ether_token_wrapper.ts
@@ -1,4 +1,5 @@
 import * as _ from 'lodash';
+import BigNumber from 'bignumber.js';
 import {Web3Wrapper} from '../web3_wrapper';
 import {ContractWrapper} from './contract_wrapper';
 import {TokenWrapper} from './token_wrapper';
@@ -27,7 +28,7 @@ export class EtherTokenWrapper extends ContractWrapper {
      * @param   depositor   The hex encoded user Ethereum address that would like to make the deposit.
      * @return Transaction hash.
      */
-    public async depositAsync(amountInWei: BigNumber.BigNumber, depositor: string): Promise<string> {
+    public async depositAsync(amountInWei: BigNumber, depositor: string): Promise<string> {
         assert.isBigNumber('amountInWei', amountInWei);
         await assert.isSenderAddressAsync('depositor', depositor, this._web3Wrapper);
 
@@ -48,7 +49,7 @@ export class EtherTokenWrapper extends ContractWrapper {
      * @param   withdrawer   The hex encoded user Ethereum address that would like to make the withdrawl.
      * @return Transaction hash.
      */
-    public async withdrawAsync(amountInWei: BigNumber.BigNumber, withdrawer: string): Promise<string> {
+    public async withdrawAsync(amountInWei: BigNumber, withdrawer: string): Promise<string> {
         assert.isBigNumber('amountInWei', amountInWei);
         await assert.isSenderAddressAsync('withdrawer', withdrawer, this._web3Wrapper);
 
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 7d8426d04..b8704e72c 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -1,6 +1,6 @@
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 import {schemas} from '0x-json-schemas';
 import {Web3Wrapper} from '../web3_wrapper';
 import {
@@ -97,7 +97,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @return  The amount of the order (in taker tokens) that has either been filled or canceled.
      */
     public async getUnavailableTakerAmountAsync(orderHash: string,
-                                                methodOpts?: MethodOpts): Promise<BigNumber.BigNumber> {
+                                                methodOpts?: MethodOpts): Promise<BigNumber> {
         assert.doesConformToSchema('orderHash', orderHash, schemas.orderHashSchema);
 
         const exchangeContract = await this._getExchangeContractAsync();
@@ -115,7 +115,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @param   methodOpts   Optional arguments this method accepts.
      * @return  The amount of the order (in taker tokens) that has already been filled.
      */
-    public async getFilledTakerAmountAsync(orderHash: string, methodOpts?: MethodOpts): Promise<BigNumber.BigNumber> {
+    public async getFilledTakerAmountAsync(orderHash: string, methodOpts?: MethodOpts): Promise<BigNumber> {
         assert.doesConformToSchema('orderHash', orderHash, schemas.orderHashSchema);
 
         const exchangeContract = await this._getExchangeContractAsync();
@@ -132,7 +132,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @param   methodOpts   Optional arguments this method accepts.
      * @return  The amount of the order (in taker tokens) that has been cancelled.
      */
-    public async getCanceledTakerAmountAsync(orderHash: string, methodOpts?: MethodOpts): Promise<BigNumber.BigNumber> {
+    public async getCanceledTakerAmountAsync(orderHash: string, methodOpts?: MethodOpts): Promise<BigNumber> {
         assert.doesConformToSchema('orderHash', orderHash, schemas.orderHashSchema);
 
         const exchangeContract = await this._getExchangeContractAsync();
@@ -162,7 +162,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @return  Transaction hash.
      */
     @decorators.contractCallErrorHandler
-    public async fillOrderAsync(signedOrder: SignedOrder, fillTakerTokenAmount: BigNumber.BigNumber,
+    public async fillOrderAsync(signedOrder: SignedOrder, fillTakerTokenAmount: BigNumber,
                                 shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                                 takerAddress: string,
                                 orderTransactionOpts?: OrderTransactionOpts): Promise<string> {
@@ -229,7 +229,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @return  Transaction hash.
      */
     @decorators.contractCallErrorHandler
-    public async fillOrdersUpToAsync(signedOrders: SignedOrder[], fillTakerTokenAmount: BigNumber.BigNumber,
+    public async fillOrdersUpToAsync(signedOrders: SignedOrder[], fillTakerTokenAmount: BigNumber,
                                      shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                                      takerAddress: string,
                                      orderTransactionOpts?: OrderTransactionOpts): Promise<string> {
@@ -405,7 +405,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @return  Transaction hash.
      */
     @decorators.contractCallErrorHandler
-    public async fillOrKillOrderAsync(signedOrder: SignedOrder, fillTakerTokenAmount: BigNumber.BigNumber,
+    public async fillOrKillOrderAsync(signedOrder: SignedOrder, fillTakerTokenAmount: BigNumber,
                                       takerAddress: string,
                                       orderTransactionOpts?: OrderTransactionOpts): Promise<string> {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
@@ -541,7 +541,7 @@ export class ExchangeWrapper extends ContractWrapper {
      */
     @decorators.contractCallErrorHandler
     public async cancelOrderAsync(order: Order|SignedOrder,
-                                  cancelTakerTokenAmount: BigNumber.BigNumber,
+                                  cancelTakerTokenAmount: BigNumber,
                                   orderTransactionOpts?: OrderTransactionOpts): Promise<string> {
         assert.doesConformToSchema('order', order, schemas.orderSchema);
         assert.isBigNumber('takerTokenCancelAmount', cancelTakerTokenAmount);
@@ -736,7 +736,7 @@ export class ExchangeWrapper extends ContractWrapper {
      *                                  Must be available via the supplied Web3.Provider passed to 0x.js.
      */
     public async validateFillOrderThrowIfInvalidAsync(signedOrder: SignedOrder,
-                                                      fillTakerTokenAmount: BigNumber.BigNumber,
+                                                      fillTakerTokenAmount: BigNumber,
                                                       takerAddress: string): Promise<void> {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isBigNumber('fillTakerTokenAmount', fillTakerTokenAmount);
@@ -753,7 +753,7 @@ export class ExchangeWrapper extends ContractWrapper {
      * @param   cancelTakerTokenAmount  The amount (specified in taker tokens) that you would like to cancel.
      */
     public async validateCancelOrderThrowIfInvalidAsync(
-        order: Order, cancelTakerTokenAmount: BigNumber.BigNumber): Promise<void> {
+        order: Order, cancelTakerTokenAmount: BigNumber): Promise<void> {
         assert.doesConformToSchema('order', order, schemas.orderSchema);
         assert.isBigNumber('cancelTakerTokenAmount', cancelTakerTokenAmount);
         const orderHash = utils.getOrderHashHex(order);
@@ -770,7 +770,7 @@ export class ExchangeWrapper extends ContractWrapper {
      *                                  Must be available via the supplied Web3.Provider passed to 0x.js.
      */
     public async validateFillOrKillOrderThrowIfInvalidAsync(signedOrder: SignedOrder,
-                                                            fillTakerTokenAmount: BigNumber.BigNumber,
+                                                            fillTakerTokenAmount: BigNumber,
                                                             takerAddress: string): Promise<void> {
         assert.doesConformToSchema('signedOrder', signedOrder, schemas.signedOrderSchema);
         assert.isBigNumber('fillTakerTokenAmount', fillTakerTokenAmount);
@@ -789,9 +789,9 @@ export class ExchangeWrapper extends ContractWrapper {
      * @param   takerTokenAmount       The order size on the taker side
      * @param   makerTokenAmount       The order size on the maker side
      */
-    public async isRoundingErrorAsync(fillTakerTokenAmount: BigNumber.BigNumber,
-                                      takerTokenAmount: BigNumber.BigNumber,
-                                      makerTokenAmount: BigNumber.BigNumber): Promise<boolean> {
+    public async isRoundingErrorAsync(fillTakerTokenAmount: BigNumber,
+                                      takerTokenAmount: BigNumber,
+                                      makerTokenAmount: BigNumber): Promise<boolean> {
         assert.isBigNumber('fillTakerTokenAmount', fillTakerTokenAmount);
         assert.isBigNumber('takerTokenAmount', takerTokenAmount);
         assert.isBigNumber('makerTokenAmount', makerTokenAmount);
diff --git a/src/contract_wrappers/token_wrapper.ts b/src/contract_wrappers/token_wrapper.ts
index 70dbc5bfb..5d6d61cef 100644
--- a/src/contract_wrappers/token_wrapper.ts
+++ b/src/contract_wrappers/token_wrapper.ts
@@ -1,5 +1,5 @@
 import * as _ from 'lodash';
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 import {schemas} from '0x-json-schemas';
 import {Web3Wrapper} from '../web3_wrapper';
 import {assert} from '../utils/assert';
@@ -46,7 +46,7 @@ export class TokenWrapper extends ContractWrapper {
      * @return  The owner's ERC20 token balance in base units.
      */
     public async getBalanceAsync(tokenAddress: string, ownerAddress: string,
-                                 methodOpts?: MethodOpts): Promise<BigNumber.BigNumber> {
+                                 methodOpts?: MethodOpts): Promise<BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
 
@@ -68,7 +68,7 @@ export class TokenWrapper extends ContractWrapper {
      * @return Transaction hash.
      */
     public async setAllowanceAsync(tokenAddress: string, ownerAddress: string, spenderAddress: string,
-                                   amountInBaseUnits: BigNumber.BigNumber): Promise<string> {
+                                   amountInBaseUnits: BigNumber): Promise<string> {
         await assert.isSenderAddressAsync('ownerAddress', ownerAddress, this._web3Wrapper);
         assert.isETHAddressHex('spenderAddress', spenderAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
@@ -113,7 +113,7 @@ export class TokenWrapper extends ContractWrapper {
      * @param   methodOpts      Optional arguments this method accepts.
      */
     public async getAllowanceAsync(tokenAddress: string, ownerAddress: string,
-                                   spenderAddress: string, methodOpts?: MethodOpts): Promise<BigNumber.BigNumber> {
+                                   spenderAddress: string, methodOpts?: MethodOpts): Promise<BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
 
@@ -131,7 +131,7 @@ export class TokenWrapper extends ContractWrapper {
      * @param   methodOpts      Optional arguments this method accepts.
      */
     public async getProxyAllowanceAsync(tokenAddress: string, ownerAddress: string,
-                                        methodOpts?: MethodOpts): Promise<BigNumber.BigNumber> {
+                                        methodOpts?: MethodOpts): Promise<BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
 
@@ -149,7 +149,7 @@ export class TokenWrapper extends ContractWrapper {
      * @return Transaction hash.
      */
     public async setProxyAllowanceAsync(tokenAddress: string, ownerAddress: string,
-                                        amountInBaseUnits: BigNumber.BigNumber): Promise<string> {
+                                        amountInBaseUnits: BigNumber): Promise<string> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
         assert.isBigNumber('amountInBaseUnits', amountInBaseUnits);
@@ -183,7 +183,7 @@ export class TokenWrapper extends ContractWrapper {
      * @return Transaction hash.
      */
     public async transferAsync(tokenAddress: string, fromAddress: string, toAddress: string,
-                               amountInBaseUnits: BigNumber.BigNumber): Promise<string> {
+                               amountInBaseUnits: BigNumber): Promise<string> {
         assert.isETHAddressHex('tokenAddress', tokenAddress);
         await assert.isSenderAddressAsync('fromAddress', fromAddress, this._web3Wrapper);
         assert.isETHAddressHex('toAddress', toAddress);
@@ -215,7 +215,7 @@ export class TokenWrapper extends ContractWrapper {
      * @return Transaction hash.
      */
     public async transferFromAsync(tokenAddress: string, fromAddress: string, toAddress: string,
-                                   senderAddress: string, amountInBaseUnits: BigNumber.BigNumber):
+                                   senderAddress: string, amountInBaseUnits: BigNumber):
                                    Promise<string> {
         assert.isETHAddressHex('tokenAddress', tokenAddress);
         assert.isETHAddressHex('fromAddress', fromAddress);
diff --git a/src/globals.d.ts b/src/globals.d.ts
index 05d7131c2..cb3800056 100644
--- a/src/globals.d.ts
+++ b/src/globals.d.ts
@@ -12,12 +12,6 @@ declare module 'web3-provider-engine/subproviders/rpc';
 // disallow `namespace`, we disable tslint for the following.
 /* tslint:disable */
 declare namespace Chai {
-    interface NumberComparer {
-        (value: number|BigNumber.BigNumber, message?: string): Assertion;
-    }
-    interface NumericComparison {
-        greaterThan: NumberComparer;
-    }
     interface Assertion {
         bignumber: Assertion;
         // HACK: In order to comply with chai-as-promised we make eventually a `PromisedAssertion` not an `Assertion`
@@ -70,8 +64,6 @@ declare module 'truffle-hdwallet-provider' {
 
 // abi-decoder declarations
 interface DecodedLogArg {
-    name: string;
-    value: string|BigNumber.BigNumber;
 }
 interface DecodedLog {
     name: string;
diff --git a/src/globalsAugment.d.ts b/src/globalsAugment.d.ts
new file mode 100644
index 000000000..60e2312a3
--- /dev/null
+++ b/src/globalsAugment.d.ts
@@ -0,0 +1,23 @@
+import BigNumber from 'bignumber.js';
+
+// HACK: This module overrides the Chai namespace so that we can use BigNumber types inside.
+// Source: https://github.com/Microsoft/TypeScript/issues/7352#issuecomment-191547232
+declare global {
+    // HACK: In order to merge the bignumber declaration added by chai-bignumber to the chai Assertion
+    // interface we must use `namespace` as the Chai definitelyTyped definition does. Since we otherwise
+    // disallow `namespace`, we disable tslint for the following.
+    /* tslint:disable */
+    namespace Chai {
+        interface NumberComparer {
+            (value: number|BigNumber, message?: string): Assertion;
+        }
+        interface NumericComparison {
+            greaterThan: NumberComparer;
+        }
+    }
+    /* tslint:enable */
+    interface DecodedLogArg {
+        name: string;
+        value: string|BigNumber;
+    }
+}
diff --git a/src/types.ts b/src/types.ts
index cb5fe4405..9ac726ef8 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,4 +1,5 @@
 import * as Web3 from 'web3';
+import BigNumber from 'bignumber.js';
 
 export enum ZeroExError {
     ContractDoesNotExist = 'CONTRACT_DOES_NOT_EXIST',
@@ -33,8 +34,8 @@ export interface ECSignature {
 
 export type OrderAddresses = [string, string, string, string, string];
 
-export type OrderValues = [BigNumber.BigNumber, BigNumber.BigNumber, BigNumber.BigNumber,
-                           BigNumber.BigNumber, BigNumber.BigNumber, BigNumber.BigNumber];
+export type OrderValues = [BigNumber, BigNumber, BigNumber,
+                           BigNumber, BigNumber, BigNumber];
 
 export interface LogEvent<ArgsType> extends LogWithDecodedArgs<ArgsType> {
     removed: boolean;
@@ -54,77 +55,77 @@ export interface ExchangeContract extends Web3.ContractInstance {
         callAsync: () => Promise<string>;
     };
     getUnavailableTakerTokenAmount: {
-        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber.BigNumber>;
+        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
     };
     isRoundingError: {
-        callAsync: (takerTokenFillAmount: BigNumber.BigNumber, takerTokenAmount: BigNumber.BigNumber,
-                    makerTokenAmount: BigNumber.BigNumber, txOpts?: TxOpts) => Promise<boolean>;
+        callAsync: (takerTokenFillAmount: BigNumber, takerTokenAmount: BigNumber,
+                    makerTokenAmount: BigNumber, txOpts?: TxOpts) => Promise<boolean>;
     };
     fillOrder: {
         sendTransactionAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                               fillTakerTokenAmount: BigNumber.BigNumber,
+                               fillTakerTokenAmount: BigNumber,
                                shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                                v: number, r: string, s: string, txOpts?: TxOpts) => Promise<string>;
         estimateGasAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                           fillTakerTokenAmount: BigNumber.BigNumber,
+                           fillTakerTokenAmount: BigNumber,
                            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                            v: number, r: string, s: string, txOpts?: TxOpts) => Promise<number>;
     };
     batchFillOrders: {
         sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               fillTakerTokenAmounts: BigNumber.BigNumber[],
+                               fillTakerTokenAmounts: BigNumber[],
                                shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                                v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<string>;
         estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           fillTakerTokenAmounts: BigNumber.BigNumber[],
+                           fillTakerTokenAmounts: BigNumber[],
                            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                            v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<number>;
     };
     fillOrdersUpTo: {
         sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               fillTakerTokenAmount: BigNumber.BigNumber,
+                               fillTakerTokenAmount: BigNumber,
                                shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                                v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<string>;
         estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           fillTakerTokenAmount: BigNumber.BigNumber,
+                           fillTakerTokenAmount: BigNumber,
                            shouldThrowOnInsufficientBalanceOrAllowance: boolean,
                            v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<number>;
     };
     cancelOrder: {
         sendTransactionAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                               cancelTakerTokenAmount: BigNumber.BigNumber, txOpts?: TxOpts) => Promise<string>;
+                               cancelTakerTokenAmount: BigNumber, txOpts?: TxOpts) => Promise<string>;
         estimateGasAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                           cancelTakerTokenAmount: BigNumber.BigNumber,
+                           cancelTakerTokenAmount: BigNumber,
                            txOpts?: TxOpts) => Promise<number>;
     };
     batchCancelOrders: {
         sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               cancelTakerTokenAmounts: BigNumber.BigNumber[], txOpts?: TxOpts) => Promise<string>;
+                               cancelTakerTokenAmounts: BigNumber[], txOpts?: TxOpts) => Promise<string>;
         estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           cancelTakerTokenAmounts: BigNumber.BigNumber[],
+                           cancelTakerTokenAmounts: BigNumber[],
                            txOpts?: TxOpts) => Promise<number>;
     };
     fillOrKillOrder: {
         sendTransactionAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                               fillTakerTokenAmount: BigNumber.BigNumber,
+                               fillTakerTokenAmount: BigNumber,
                                v: number, r: string, s: string, txOpts?: TxOpts) => Promise<string>;
         estimateGasAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues,
-                           fillTakerTokenAmount: BigNumber.BigNumber,
+                           fillTakerTokenAmount: BigNumber,
                            v: number, r: string, s: string, txOpts?: TxOpts) => Promise<number>;
     };
     batchFillOrKillOrders: {
         sendTransactionAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                               fillTakerTokenAmounts: BigNumber.BigNumber[],
+                               fillTakerTokenAmounts: BigNumber[],
                                v: number[], r: string[], s: string[], txOpts: TxOpts) => Promise<string>;
         estimateGasAsync: (orderAddresses: OrderAddresses[], orderValues: OrderValues[],
-                           fillTakerTokenAmounts: BigNumber.BigNumber[],
+                           fillTakerTokenAmounts: BigNumber[],
                            v: number[], r: string[], s: string[], txOpts?: TxOpts) => Promise<number>;
     };
     filled: {
-        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber.BigNumber>;
+        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
     };
     cancelled: {
-        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber.BigNumber>;
+        callAsync: (orderHash: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
     };
     getOrderHash: {
         callAsync: (orderAddresses: OrderAddresses, orderValues: OrderValues) => Promise<string>;
@@ -133,22 +134,22 @@ export interface ExchangeContract extends Web3.ContractInstance {
 
 export interface TokenContract extends Web3.ContractInstance {
     balanceOf: {
-        callAsync: (address: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber.BigNumber>;
+        callAsync: (address: string, defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
     };
     allowance: {
         callAsync: (ownerAddress: string, allowedAddress: string,
-                    defaultBlock?: Web3.BlockParam) => Promise<BigNumber.BigNumber>;
+                    defaultBlock?: Web3.BlockParam) => Promise<BigNumber>;
     };
     transfer: {
-        sendTransactionAsync: (toAddress: string, amountInBaseUnits: BigNumber.BigNumber,
+        sendTransactionAsync: (toAddress: string, amountInBaseUnits: BigNumber,
                                txOpts?: TxOpts) => Promise<string>;
     };
     transferFrom: {
-        sendTransactionAsync: (fromAddress: string, toAddress: string, amountInBaseUnits: BigNumber.BigNumber,
+        sendTransactionAsync: (fromAddress: string, toAddress: string, amountInBaseUnits: BigNumber,
                                txOpts?: TxOpts) => Promise<string>;
     };
     approve: {
-        sendTransactionAsync: (proxyAddress: string, amountInBaseUnits: BigNumber.BigNumber,
+        sendTransactionAsync: (proxyAddress: string, amountInBaseUnits: BigNumber,
                                txOpts?: TxOpts) => Promise<string>;
     };
 }
@@ -179,7 +180,7 @@ export interface EtherTokenContract extends Web3.ContractInstance {
         sendTransactionAsync: (txOpts: TxOpts) => Promise<string>;
     };
     withdraw: {
-        sendTransactionAsync: (amount: BigNumber.BigNumber, txOpts: TxOpts) => Promise<string>;
+        sendTransactionAsync: (amount: BigNumber, txOpts: TxOpts) => Promise<string>;
     };
 }
 
@@ -253,10 +254,10 @@ export interface LogFillContractEventArgs {
     feeRecipient: string;
     makerToken: string;
     takerToken: string;
-    filledMakerTokenAmount: BigNumber.BigNumber;
-    filledTakerTokenAmount: BigNumber.BigNumber;
-    paidMakerFee: BigNumber.BigNumber;
-    paidTakerFee: BigNumber.BigNumber;
+    filledMakerTokenAmount: BigNumber;
+    filledTakerTokenAmount: BigNumber;
+    paidMakerFee: BigNumber;
+    paidTakerFee: BigNumber;
     tokens: string;
     orderHash: string;
 }
@@ -265,43 +266,43 @@ export interface LogCancelContractEventArgs {
     feeRecipient: string;
     makerToken: string;
     takerToken: string;
-    cancelledMakerTokenAmount: BigNumber.BigNumber;
-    cancelledTakerTokenAmount: BigNumber.BigNumber;
+    cancelledMakerTokenAmount: BigNumber;
+    cancelledTakerTokenAmount: BigNumber;
     tokens: string;
     orderHash: string;
 }
 export interface LogErrorContractEventArgs {
-    errorId: BigNumber.BigNumber;
+    errorId: BigNumber;
     orderHash: string;
 }
 export type ExchangeContractEventArgs = LogFillContractEventArgs|LogCancelContractEventArgs|LogErrorContractEventArgs;
 export interface TransferContractEventArgs {
     _from: string;
     _to: string;
-    _value: BigNumber.BigNumber;
+    _value: BigNumber;
 }
 export interface ApprovalContractEventArgs {
     _owner: string;
     _spender: string;
-    _value: BigNumber.BigNumber;
+    _value: BigNumber;
 }
 export type TokenContractEventArgs = TransferContractEventArgs|ApprovalContractEventArgs;
 export type ContractEventArgs = ExchangeContractEventArgs|TokenContractEventArgs;
-export type ContractEventArg = string|BigNumber.BigNumber;
+export type ContractEventArg = string|BigNumber;
 
 export interface Order {
     maker: string;
     taker: string;
-    makerFee: BigNumber.BigNumber;
-    takerFee: BigNumber.BigNumber;
-    makerTokenAmount: BigNumber.BigNumber;
-    takerTokenAmount: BigNumber.BigNumber;
+    makerFee: BigNumber;
+    takerFee: BigNumber;
+    makerTokenAmount: BigNumber;
+    takerTokenAmount: BigNumber;
     makerTokenAddress: string;
     takerTokenAddress: string;
-    salt: BigNumber.BigNumber;
+    salt: BigNumber;
     exchangeContractAddress: string;
     feeRecipient: string;
-    expirationUnixTimestampSec: BigNumber.BigNumber;
+    expirationUnixTimestampSec: BigNumber;
 }
 
 export interface SignedOrder extends Order {
@@ -309,7 +310,7 @@ export interface SignedOrder extends Order {
 }
 
 //                          [address, name, symbol, decimals, ipfsHash, swarmHash]
-export type TokenMetadata = [string, string, string, BigNumber.BigNumber, string, string];
+export type TokenMetadata = [string, string, string, BigNumber, string, string];
 
 export interface Token {
     name: string;
@@ -321,7 +322,7 @@ export interface Token {
 export interface TxOpts {
     from: string;
     gas?: number;
-    value?: BigNumber.BigNumber;
+    value?: BigNumber;
 }
 
 export interface TokenAddressBySymbol {
@@ -362,12 +363,12 @@ export type DoneCallback = (err?: Error) => void;
 
 export interface OrderCancellationRequest {
     order: Order|SignedOrder;
-    takerTokenCancelAmount: BigNumber.BigNumber;
+    takerTokenCancelAmount: BigNumber;
 }
 
 export interface OrderFillRequest {
     signedOrder: SignedOrder;
-    takerTokenFillAmount: BigNumber.BigNumber;
+    takerTokenFillAmount: BigNumber;
 }
 
 export type AsyncMethod = (...args: any[]) => Promise<any>;
@@ -395,7 +396,7 @@ export interface JSONRPCPayload {
  * etherTokenContractAddress: The address of an ether token contract to use
  */
 export interface ZeroExConfig {
-    gasPrice?: BigNumber.BigNumber; // Gas price to use with every transaction
+    gasPrice?: BigNumber; // Gas price to use with every transaction
     exchangeContractAddress?: string;
     tokenRegistryContractAddress?: string;
     etherTokenContractAddress?: string;
@@ -439,7 +440,7 @@ export interface Artifact {
  * allowance/balance to fill the entire remaining order amount.
  */
 export interface ValidateOrderFillableOpts {
-    expectedFillTakerTokenAmount?: BigNumber.BigNumber;
+    expectedFillTakerTokenAmount?: BigNumber;
 }
 
 /*
diff --git a/src/utils/abi_decoder.ts b/src/utils/abi_decoder.ts
index a6c45bee7..247ba0e5b 100644
--- a/src/utils/abi_decoder.ts
+++ b/src/utils/abi_decoder.ts
@@ -1,6 +1,6 @@
 import * as Web3 from 'web3';
 import * as _ from 'lodash';
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 import {AbiType, DecodedLogArgs, LogWithDecodedArgs, RawLog, SolidityTypes, ContractEventArgs} from '../types';
 import * as SolidityCoder from 'web3/lib/solidity/coder';
 
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index 099f4490f..286105345 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -1,5 +1,5 @@
 import * as _ from 'lodash';
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 import * as Web3 from 'web3';
 import {Web3Wrapper} from '../web3_wrapper';
 import {SchemaValidator, Schema} from '0x-json-schemas';
@@ -7,8 +7,8 @@ import {SchemaValidator, Schema} from '0x-json-schemas';
 const HEX_REGEX = /^0x[0-9A-F]*$/i;
 
 export const assert = {
-    isBigNumber(variableName: string, value: BigNumber.BigNumber): void {
-        const isBigNumber = _.isObject(value) && value.isBigNumber;
+    isBigNumber(variableName: string, value: BigNumber): void {
+        const isBigNumber = _.isObject(value) && (value as any).isBigNumber;
         this.assert(isBigNumber, this.typeAssertionMessage(variableName, 'BigNumber', value));
     },
     isUndefined(value: any, variableName?: string): void {
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index a066fe869..3de3f5bc1 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -1,4 +1,4 @@
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 
 export const constants = {
     NULL_ADDRESS: '0x0000000000000000000000000000000000000000',
diff --git a/src/utils/exchange_transfer_simulator.ts b/src/utils/exchange_transfer_simulator.ts
index db12abd29..89b23c8ab 100644
--- a/src/utils/exchange_transfer_simulator.ts
+++ b/src/utils/exchange_transfer_simulator.ts
@@ -1,4 +1,5 @@
 import * as _ from 'lodash';
+import BigNumber from 'bignumber.js';
 import {ExchangeContractErrs, TradeSide, TransferType} from '../types';
 import {TokenWrapper} from '../contract_wrappers/token_wrapper';
 
@@ -37,12 +38,12 @@ export class BalanceAndProxyAllowanceLazyStore {
     protected _token: TokenWrapper;
     private _balance: {
         [tokenAddress: string]: {
-            [userAddress: string]: BigNumber.BigNumber,
+            [userAddress: string]: BigNumber,
         },
     };
     private _proxyAllowance: {
         [tokenAddress: string]: {
-            [userAddress: string]: BigNumber.BigNumber,
+            [userAddress: string]: BigNumber,
         },
     };
     constructor(token: TokenWrapper) {
@@ -50,7 +51,7 @@ export class BalanceAndProxyAllowanceLazyStore {
         this._balance = {};
         this._proxyAllowance = {};
     }
-    protected async getBalanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber.BigNumber> {
+    protected async getBalanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> {
         if (_.isUndefined(this._balance[tokenAddress]) || _.isUndefined(this._balance[tokenAddress][userAddress])) {
             const balance = await this._token.getBalanceAsync(tokenAddress, userAddress);
             this.setBalance(tokenAddress, userAddress, balance);
@@ -58,13 +59,13 @@ export class BalanceAndProxyAllowanceLazyStore {
         const cachedBalance = this._balance[tokenAddress][userAddress];
         return cachedBalance;
     }
-    protected setBalance(tokenAddress: string, userAddress: string, balance: BigNumber.BigNumber): void {
+    protected setBalance(tokenAddress: string, userAddress: string, balance: BigNumber): void {
         if (_.isUndefined(this._balance[tokenAddress])) {
             this._balance[tokenAddress] = {};
         }
         this._balance[tokenAddress][userAddress] = balance;
     }
-    protected async getProxyAllowanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber.BigNumber> {
+    protected async getProxyAllowanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> {
         if (_.isUndefined(this._proxyAllowance[tokenAddress]) ||
             _.isUndefined(this._proxyAllowance[tokenAddress][userAddress])) {
             const proxyAllowance = await this._token.getProxyAllowanceAsync(tokenAddress, userAddress);
@@ -73,7 +74,7 @@ export class BalanceAndProxyAllowanceLazyStore {
         const cachedProxyAllowance = this._proxyAllowance[tokenAddress][userAddress];
         return cachedProxyAllowance;
     }
-    protected setProxyAllowance(tokenAddress: string, userAddress: string, proxyAllowance: BigNumber.BigNumber): void {
+    protected setProxyAllowance(tokenAddress: string, userAddress: string, proxyAllowance: BigNumber): void {
         if (_.isUndefined(this._proxyAllowance[tokenAddress])) {
             this._proxyAllowance[tokenAddress] = {};
         }
@@ -92,7 +93,7 @@ export class ExchangeTransferSimulator extends BalanceAndProxyAllowanceLazyStore
      * @param  transferType      Is it a fee payment or a value transfer
      */
     public async transferFromAsync(tokenAddress: string, from: string, to: string,
-                                   amountInBaseUnits: BigNumber.BigNumber, tradeSide: TradeSide,
+                                   amountInBaseUnits: BigNumber, tradeSide: TradeSide,
                                    transferType: TransferType): Promise<void> {
         const balance = await this.getBalanceAsync(tokenAddress, from);
         const proxyAllowance = await this.getProxyAllowanceAsync(tokenAddress, from);
@@ -107,19 +108,19 @@ export class ExchangeTransferSimulator extends BalanceAndProxyAllowanceLazyStore
         await this.increaseBalanceAsync(tokenAddress, to, amountInBaseUnits);
     }
     private async decreaseProxyAllowanceAsync(tokenAddress: string, userAddress: string,
-                                              amountInBaseUnits: BigNumber.BigNumber): Promise<void> {
+                                              amountInBaseUnits: BigNumber): Promise<void> {
         const proxyAllowance = await this.getProxyAllowanceAsync(tokenAddress, userAddress);
         if (!proxyAllowance.eq(this._token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS)) {
             this.setProxyAllowance(tokenAddress, userAddress, proxyAllowance.minus(amountInBaseUnits));
         }
     }
     private async increaseBalanceAsync(tokenAddress: string, userAddress: string,
-                                       amountInBaseUnits: BigNumber.BigNumber): Promise<void> {
+                                       amountInBaseUnits: BigNumber): Promise<void> {
         const balance = await this.getBalanceAsync(tokenAddress, userAddress);
         this.setBalance(tokenAddress, userAddress, balance.plus(amountInBaseUnits));
     }
     private async decreaseBalanceAsync(tokenAddress: string, userAddress: string,
-                                       amountInBaseUnits: BigNumber.BigNumber): Promise<void> {
+                                       amountInBaseUnits: BigNumber): Promise<void> {
         const balance = await this.getBalanceAsync(tokenAddress, userAddress);
         this.setBalance(tokenAddress, userAddress, balance.minus(amountInBaseUnits));
     }
diff --git a/src/utils/order_validation_utils.ts b/src/utils/order_validation_utils.ts
index b7eae7e2f..f03703c4e 100644
--- a/src/utils/order_validation_utils.ts
+++ b/src/utils/order_validation_utils.ts
@@ -1,4 +1,5 @@
 import * as _ from 'lodash';
+import BigNumber from 'bignumber.js';
 import {ExchangeContractErrs, SignedOrder, Order, ZeroExError, TradeSide, TransferType} from '../types';
 import {ZeroEx} from '../0x';
 import {TokenWrapper} from '../contract_wrappers/token_wrapper';
@@ -16,7 +17,7 @@ export class OrderValidationUtils {
     }
     public async validateOrderFillableOrThrowAsync(
         exchangeTradeEmulator: ExchangeTransferSimulator, signedOrder: SignedOrder, zrxTokenAddress: string,
-        expectedFillTakerTokenAmount?: BigNumber.BigNumber): Promise<void> {
+        expectedFillTakerTokenAmount?: BigNumber): Promise<void> {
         const orderHash = utils.getOrderHashHex(signedOrder);
         const unavailableTakerTokenAmount = await this.exchangeWrapper.getUnavailableTakerAmountAsync(orderHash);
         this.validateRemainingFillAmountNotZeroOrThrow(
@@ -48,8 +49,8 @@ export class OrderValidationUtils {
     }
     public async validateFillOrderThrowIfInvalidAsync(
         exchangeTradeEmulator: ExchangeTransferSimulator, signedOrder: SignedOrder,
-        fillTakerTokenAmount: BigNumber.BigNumber, takerAddress: string,
-        zrxTokenAddress: string): Promise<BigNumber.BigNumber> {
+        fillTakerTokenAmount: BigNumber, takerAddress: string,
+        zrxTokenAddress: string): Promise<BigNumber> {
         if (fillTakerTokenAmount.eq(0)) {
             throw new Error(ExchangeContractErrs.OrderFillAmountZero);
         }
@@ -83,7 +84,7 @@ export class OrderValidationUtils {
     }
     public async validateFillOrKillOrderThrowIfInvalidAsync(
         exchangeTradeEmulator: ExchangeTransferSimulator, signedOrder: SignedOrder,
-        fillTakerTokenAmount: BigNumber.BigNumber, takerAddress: string, zrxTokenAddress: string): Promise<void> {
+        fillTakerTokenAmount: BigNumber, takerAddress: string, zrxTokenAddress: string): Promise<void> {
         const filledTakerTokenAmount = await this.validateFillOrderThrowIfInvalidAsync(
             exchangeTradeEmulator, signedOrder, fillTakerTokenAmount, takerAddress, zrxTokenAddress,
         );
@@ -92,8 +93,8 @@ export class OrderValidationUtils {
         }
     }
     public async validateCancelOrderThrowIfInvalidAsync(order: Order,
-                                                        cancelTakerTokenAmount: BigNumber.BigNumber,
-                                                        unavailableTakerTokenAmount: BigNumber.BigNumber,
+                                                        cancelTakerTokenAmount: BigNumber,
+                                                        unavailableTakerTokenAmount: BigNumber,
     ): Promise<void> {
         if (cancelTakerTokenAmount.eq(0)) {
             throw new Error(ExchangeContractErrs.OrderCancelAmountZero);
@@ -108,7 +109,7 @@ export class OrderValidationUtils {
     }
     public async validateFillOrderBalancesAllowancesThrowIfInvalidAsync(
         exchangeTradeEmulator: ExchangeTransferSimulator, signedOrder: SignedOrder,
-        fillTakerTokenAmount: BigNumber.BigNumber, senderAddress: string, zrxTokenAddress: string): Promise<void> {
+        fillTakerTokenAmount: BigNumber, senderAddress: string, zrxTokenAddress: string): Promise<void> {
         const fillMakerTokenAmount = this.getPartialAmount(
             fillTakerTokenAmount,
             signedOrder.takerTokenAmount,
@@ -142,20 +143,20 @@ export class OrderValidationUtils {
         );
     }
     private validateRemainingFillAmountNotZeroOrThrow(
-        takerTokenAmount: BigNumber.BigNumber, unavailableTakerTokenAmount: BigNumber.BigNumber,
+        takerTokenAmount: BigNumber, unavailableTakerTokenAmount: BigNumber,
     ) {
         if (takerTokenAmount.eq(unavailableTakerTokenAmount)) {
             throw new Error(ExchangeContractErrs.OrderRemainingFillAmountZero);
         }
     }
-    private validateOrderNotExpiredOrThrow(expirationUnixTimestampSec: BigNumber.BigNumber) {
+    private validateOrderNotExpiredOrThrow(expirationUnixTimestampSec: BigNumber) {
         const currentUnixTimestampSec = utils.getCurrentUnixTimestamp();
         if (expirationUnixTimestampSec.lessThan(currentUnixTimestampSec)) {
             throw new Error(ExchangeContractErrs.OrderFillExpired);
         }
     }
-    private getPartialAmount(numerator: BigNumber.BigNumber, denominator: BigNumber.BigNumber,
-                             target: BigNumber.BigNumber): BigNumber.BigNumber {
+    private getPartialAmount(numerator: BigNumber, denominator: BigNumber,
+                             target: BigNumber): BigNumber {
         const fillMakerTokenAmount = numerator
                                      .mul(target)
                                      .div(denominator)
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index f2bf74860..280f3e979 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -2,7 +2,7 @@ import * as _ from 'lodash';
 import * as ethABI from 'ethereumjs-abi';
 import * as ethUtil from 'ethereumjs-util';
 import {Order, SignedOrder, SolidityTypes} from '../types';
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 import BN = require('bn.js');
 
 export const utils = {
@@ -12,7 +12,7 @@ export const utils = {
      * expects values of Solidity type `uint` to be passed as type `BN`.
      * We do not use BN anywhere else in the codebase.
      */
-    bigNumberToBN(value: BigNumber.BigNumber) {
+    bigNumberToBN(value: BigNumber) {
         return new BN(value.toString(), 10);
     },
     consoleLog(message: string): void {
@@ -49,7 +49,7 @@ export const utils = {
         const hashHex = ethUtil.bufferToHex(hashBuff);
         return hashHex;
     },
-    getCurrentUnixTimestamp(): BigNumber.BigNumber {
+    getCurrentUnixTimestamp(): BigNumber {
         return new BigNumber(Date.now() / 1000);
     },
 };
diff --git a/src/web3_wrapper.ts b/src/web3_wrapper.ts
index ff5d25d9c..3b1e4477b 100644
--- a/src/web3_wrapper.ts
+++ b/src/web3_wrapper.ts
@@ -1,6 +1,6 @@
 import * as _ from 'lodash';
 import * as Web3 from 'web3';
-import * as BigNumber from 'bignumber.js';
+import BigNumber from 'bignumber.js';
 import promisify = require('es6-promisify');
 import {ZeroExError, Artifact} from './types';
 import {Contract} from './contract';
@@ -75,11 +75,11 @@ export class Web3Wrapper {
         );
         return contractInstance;
     }
-    public toWei(ethAmount: BigNumber.BigNumber): BigNumber.BigNumber {
+    public toWei(ethAmount: BigNumber): BigNumber {
         const balanceWei = this.web3.toWei(ethAmount, 'ether');
         return balanceWei;
     }
-    public async getBalanceInWeiAsync(owner: string): Promise<BigNumber.BigNumber> {
+    public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
         let balanceInWei = await promisify(this.web3.eth.getBalance)(owner);
         balanceInWei = new BigNumber(balanceInWei);
         return balanceInWei;