Return SignedOrder from signing utils.

Create a helper back in EIP712Utils for code cleanup.
Moved constants in order-utils into the constants object

25 files changed, 380 insertions, 192 deletions

diff --git a/packages/0x.js/CHANGELOG.json b/packages/0x.js/CHANGELOG.json
index c25acd3bf..3a184382c 100644
--- a/packages/0x.js/CHANGELOG.json
+++ b/packages/0x.js/CHANGELOG.json
@@ -12,7 +12,7 @@
             },
             {
                 "note":
-                    "Removed `SignerType` (including `SignerType.Metamask`). Please use the `MetamaskSubprovider` to wrap web3.currentProvider.",
+                    "Removed `SignerType` (including `SignerType.Metamask`). Please use the `MetamaskSubprovider` to wrap `web3.currentProvider`.",
                 "pr": 1102
             }
         ]
diff --git a/packages/contract-wrappers/src/utils/transaction_encoder.ts b/packages/contract-wrappers/src/utils/transaction_encoder.ts
index 1800f49ad..d9735778e 100644
--- a/packages/contract-wrappers/src/utils/transaction_encoder.ts
+++ b/packages/contract-wrappers/src/utils/transaction_encoder.ts
@@ -1,5 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
-import { EIP712_DOMAIN_NAME, EIP712_DOMAIN_SCHEMA, EIP712_DOMAIN_VERSION } from '@0xproject/order-utils';
+import { eip712Utils } from '@0xproject/order-utils';
 import { Order, SignedOrder } from '@0xproject/types';
 import { BigNumber, signTypedDataUtils } from '@0xproject/utils';
 import _ = require('lodash');
@@ -8,15 +8,6 @@ import { ExchangeContract } from '../contract_wrappers/generated/exchange';
 
 import { assert } from './assert';
 
-const EIP712_ZEROEX_TRANSACTION_SCHEMA = {
-    name: 'ZeroExTransaction',
-    parameters: [
-        { name: 'salt', type: 'uint256' },
-        { name: 'signerAddress', type: 'address' },
-        { name: 'data', type: 'bytes' },
-    ],
-};
-
 /**
  * Transaction Encoder. Transaction messages exist for the purpose of calling methods on the Exchange contract
  * in the context of another address. For example, UserA can encode and sign a fillOrder transaction and UserB
@@ -37,23 +28,11 @@ export class TransactionEncoder {
     public getTransactionHex(data: string, salt: BigNumber, signerAddress: string): string {
         const exchangeAddress = this._getExchangeContract().address;
         const executeTransactionData = {
-            salt: salt.toString(),
+            salt,
             signerAddress,
             data,
         };
-        const typedData = {
-            types: {
-                EIP712Domain: EIP712_DOMAIN_SCHEMA.parameters,
-                ZeroExTransaction: EIP712_ZEROEX_TRANSACTION_SCHEMA.parameters,
-            },
-            domain: {
-                name: EIP712_DOMAIN_NAME,
-                version: EIP712_DOMAIN_VERSION,
-                verifyingContract: exchangeAddress,
-            },
-            message: executeTransactionData,
-            primaryType: EIP712_ZEROEX_TRANSACTION_SCHEMA.name,
-        };
+        const typedData = eip712Utils.createZeroExTransactionTypedData(executeTransactionData, exchangeAddress);
         const eip712MessageBuffer = signTypedDataUtils.signTypedDataHash(typedData);
         const messageHex = `0x${eip712MessageBuffer.toString('hex')}`;
         return messageHex;
diff --git a/packages/contracts/test/utils/transaction_factory.ts b/packages/contracts/test/utils/transaction_factory.ts
index 47880cca5..6e4cc4b2f 100644
--- a/packages/contracts/test/utils/transaction_factory.ts
+++ b/packages/contracts/test/utils/transaction_factory.ts
@@ -1,9 +1,4 @@
-import {
-    EIP712_DOMAIN_NAME,
-    EIP712_DOMAIN_SCHEMA,
-    EIP712_DOMAIN_VERSION,
-    generatePseudoRandomSalt,
-} from '@0xproject/order-utils';
+import { eip712Utils, generatePseudoRandomSalt } from '@0xproject/order-utils';
 import { SignatureType } from '@0xproject/types';
 import { signTypedDataUtils } from '@0xproject/utils';
 import * as ethUtil from 'ethereumjs-util';
@@ -11,15 +6,6 @@ import * as ethUtil from 'ethereumjs-util';
 import { signingUtils } from './signing_utils';
 import { SignedTransaction } from './types';
 
-const EIP712_ZEROEX_TRANSACTION_SCHEMA = {
-    name: 'ZeroExTransaction',
-    parameters: [
-        { name: 'salt', type: 'uint256' },
-        { name: 'signerAddress', type: 'address' },
-        { name: 'data', type: 'bytes' },
-    ],
-};
-
 export class TransactionFactory {
     private readonly _signerBuff: Buffer;
     private readonly _exchangeAddress: string;
@@ -33,30 +19,18 @@ export class TransactionFactory {
         const salt = generatePseudoRandomSalt();
         const signerAddress = `0x${this._signerBuff.toString('hex')}`;
         const executeTransactionData = {
-            salt: salt.toString(),
+            salt,
             signerAddress,
             data,
         };
-        const typedData = {
-            types: {
-                EIP712Domain: EIP712_DOMAIN_SCHEMA.parameters,
-                ZeroExTransaction: EIP712_ZEROEX_TRANSACTION_SCHEMA.parameters,
-            },
-            domain: {
-                name: EIP712_DOMAIN_NAME,
-                version: EIP712_DOMAIN_VERSION,
-                verifyingContract: this._exchangeAddress,
-            },
-            message: executeTransactionData,
-            primaryType: EIP712_ZEROEX_TRANSACTION_SCHEMA.name,
-        };
+
+        const typedData = eip712Utils.createZeroExTransactionTypedData(executeTransactionData, this._exchangeAddress);
         const eip712MessageBuffer = signTypedDataUtils.signTypedDataHash(typedData);
         const signature = signingUtils.signMessage(eip712MessageBuffer, this._privateKey, signatureType);
         const signedTx = {
             exchangeAddress: this._exchangeAddress,
             signature: `0x${signature.toString('hex')}`,
             ...executeTransactionData,
-            salt,
         };
         return signedTx;
     }
diff --git a/packages/json-schemas/schemas/eip712_typed_data.ts b/packages/json-schemas/schemas/eip712_typed_data.ts
index 4c4664878..371ff8a78 100644
--- a/packages/json-schemas/schemas/eip712_typed_data.ts
+++ b/packages/json-schemas/schemas/eip712_typed_data.ts
@@ -1,5 +1,5 @@
 export const eip712TypedData = {
-    id: 'eip712TypedData',
+    id: '/eip712TypedData',
     type: 'object',
     properties: {
         types: {
diff --git a/packages/order-utils/CHANGELOG.json b/packages/order-utils/CHANGELOG.json
index a9d2fde8b..2555ad350 100644
--- a/packages/order-utils/CHANGELOG.json
+++ b/packages/order-utils/CHANGELOG.json
@@ -3,15 +3,15 @@
         "version": "2.0.0",
         "changes": [
             {
-                "note": "Added ecSignOrderAsync to first sign an order as EIP712 and fallback to EthSign",
+                "note": "Added `ecSignOrderAsync` to first sign an order as EIP712 and fallback to EthSign",
                 "pr": 1102
             },
             {
-                "note": "Added ecSignTypedDataOrderAsync to sign an order exclusively as EIP712",
+                "note": "Added `ecSignTypedDataOrderAsync` to sign an order exclusively as EIP712",
                 "pr": 1102
             },
             {
-                "note": "Rename ecSignOrderHashAsync to ecSignHashAsync removing SignerType parameter",
+                "note": "Rename `ecSignOrderHashAsync` to `ecSignHashAsync` removing `SignerType` parameter",
                 "pr": 1102
             }
         ]
diff --git a/packages/order-utils/src/constants.ts b/packages/order-utils/src/constants.ts
index 5403606c3..7de20a696 100644
--- a/packages/order-utils/src/constants.ts
+++ b/packages/order-utils/src/constants.ts
@@ -13,16 +13,39 @@ export const constants = {
     BASE_16: 16,
     INFINITE_TIMESTAMP_SEC: new BigNumber(2524604400), // Close to infinite
     ZERO_AMOUNT: new BigNumber(0),
-};
-
-export const EIP712_DOMAIN_NAME = '0x Protocol';
-export const EIP712_DOMAIN_VERSION = '2';
-
-export const EIP712_DOMAIN_SCHEMA = {
-    name: 'EIP712Domain',
-    parameters: [
-        { name: 'name', type: 'string' },
-        { name: 'version', type: 'string' },
-        { name: 'verifyingContract', type: 'address' },
-    ],
+    EIP712_DOMAIN_NAME: '0x Protocol',
+    EIP712_DOMAIN_VERSION: '2',
+    EIP712_DOMAIN_SCHEMA: {
+        name: 'EIP712Domain',
+        parameters: [
+            { name: 'name', type: 'string' },
+            { name: 'version', type: 'string' },
+            { name: 'verifyingContract', type: 'address' },
+        ],
+    },
+    EIP712_ORDER_SCHEMA: {
+        name: 'Order',
+        parameters: [
+            { name: 'makerAddress', type: 'address' },
+            { name: 'takerAddress', type: 'address' },
+            { name: 'feeRecipientAddress', type: 'address' },
+            { name: 'senderAddress', type: 'address' },
+            { name: 'makerAssetAmount', type: 'uint256' },
+            { name: 'takerAssetAmount', type: 'uint256' },
+            { name: 'makerFee', type: 'uint256' },
+            { name: 'takerFee', type: 'uint256' },
+            { name: 'expirationTimeSeconds', type: 'uint256' },
+            { name: 'salt', type: 'uint256' },
+            { name: 'makerAssetData', type: 'bytes' },
+            { name: 'takerAssetData', type: 'bytes' },
+        ],
+    },
+    EIP712_ZEROEX_TRANSACTION_SCHEMA: {
+        name: 'ZeroExTransaction',
+        parameters: [
+            { name: 'salt', type: 'uint256' },
+            { name: 'signerAddress', type: 'address' },
+            { name: 'data', type: 'bytes' },
+        ],
+    },
 };
diff --git a/packages/order-utils/src/eip712_utils.ts b/packages/order-utils/src/eip712_utils.ts
new file mode 100644
index 000000000..43b421de7
--- /dev/null
+++ b/packages/order-utils/src/eip712_utils.ts
@@ -0,0 +1,75 @@
+import { EIP712Object, EIP712TypedData, EIP712Types, Order, ZeroExTransaction } from '@0xproject/types';
+import * as _ from 'lodash';
+
+import { constants } from './constants';
+
+export const eip712Utils = {
+    /**
+     * Creates a EIP712TypedData object specific to the 0x protocol for use with signTypedData.
+     * @param   primaryType The primary type found in message
+     * @param   types The additional types for the data in message
+     * @param   message The contents of the message
+     * @param   exchangeAddress The address of the exchange contract
+     * @return  A typed data object
+     */
+    createTypedData: (
+        primaryType: string,
+        types: EIP712Types,
+        message: EIP712Object,
+        exchangeAddress: string,
+    ): EIP712TypedData => {
+        const typedData = {
+            types: {
+                EIP712Domain: constants.EIP712_DOMAIN_SCHEMA.parameters,
+                ...types,
+            },
+            domain: {
+                name: constants.EIP712_DOMAIN_NAME,
+                version: constants.EIP712_DOMAIN_VERSION,
+                verifyingContract: exchangeAddress,
+            },
+            message,
+            primaryType,
+        };
+        return typedData;
+    },
+    /**
+     * Creates an Order EIP712TypedData object for use with signTypedData.
+     * @param   Order the order
+     * @return  A typed data object
+     */
+    createOrderTypedData: (order: Order): EIP712TypedData => {
+        const normalizedOrder = _.mapValues(order, value => {
+            return !_.isString(value) ? value.toString() : value;
+        });
+        const typedData = eip712Utils.createTypedData(
+            constants.EIP712_ORDER_SCHEMA.name,
+            { Order: constants.EIP712_ORDER_SCHEMA.parameters },
+            normalizedOrder,
+            order.exchangeAddress,
+        );
+        return typedData;
+    },
+    /**
+     * Creates an ExecuteTransaction EIP712TypedData object for use with signTypedData and
+     * 0x Exchange executeTransaction.
+     * @param   ZeroExTransaction the 0x transaction
+     * @param   exchangeAddress The address of the exchange contract
+     * @return  A typed data object
+     */
+    createZeroExTransactionTypedData: (
+        zeroExTransaction: ZeroExTransaction,
+        exchangeAddress: string,
+    ): EIP712TypedData => {
+        const normalizedTransaction = _.mapValues(zeroExTransaction, value => {
+            return !_.isString(value) ? value.toString() : value;
+        });
+        const typedData = eip712Utils.createTypedData(
+            constants.EIP712_ZEROEX_TRANSACTION_SCHEMA.name,
+            { ZeroExTransaction: constants.EIP712_ZEROEX_TRANSACTION_SCHEMA.parameters },
+            normalizedTransaction,
+            exchangeAddress,
+        );
+        return typedData;
+    },
+};
diff --git a/packages/order-utils/src/index.ts b/packages/order-utils/src/index.ts
index 89a843d8f..2e05fdf2b 100644
--- a/packages/order-utils/src/index.ts
+++ b/packages/order-utils/src/index.ts
@@ -18,7 +18,8 @@ export { ExchangeTransferSimulator } from './exchange_transfer_simulator';
 export { BalanceAndProxyAllowanceLazyStore } from './store/balance_and_proxy_allowance_lazy_store';
 export { OrderFilledCancelledLazyStore } from './store/order_filled_cancelled_lazy_store';
 
-export { EIP712_DOMAIN_NAME, EIP712_DOMAIN_SCHEMA, EIP712_DOMAIN_VERSION } from './constants';
+export { constants } from './constants';
+export { eip712Utils } from './eip712_utils';
 
 export { Provider, JSONRPCRequestPayload, JSONRPCErrorCallback, JSONRPCResponsePayload } from 'ethereum-types';
 export {
@@ -34,6 +35,12 @@ export {
     OrderStateValid,
     OrderStateInvalid,
     ExchangeContractErrs,
+    EIP712Parameter,
+    EIP712TypedData,
+    EIP712Types,
+    EIP712Object,
+    EIP712ObjectValue,
+    ZeroExTransaction,
 } from '@0xproject/types';
 export {
     OrderError,
diff --git a/packages/order-utils/src/order_hash.ts b/packages/order-utils/src/order_hash.ts
index 37b9da811..a6dd6688c 100644
--- a/packages/order-utils/src/order_hash.ts
+++ b/packages/order-utils/src/order_hash.ts
@@ -4,28 +4,10 @@ import { signTypedDataUtils } from '@0xproject/utils';
 import * as _ from 'lodash';
 
 import { assert } from './assert';
-import { EIP712_DOMAIN_NAME, EIP712_DOMAIN_SCHEMA, EIP712_DOMAIN_VERSION } from './constants';
+import { eip712Utils } from './eip712_utils';
 
 const INVALID_TAKER_FORMAT = 'instance.takerAddress is not of a type(s) string';
 
-export const EIP712_ORDER_SCHEMA = {
-    name: 'Order',
-    parameters: [
-        { name: 'makerAddress', type: 'address' },
-        { name: 'takerAddress', type: 'address' },
-        { name: 'feeRecipientAddress', type: 'address' },
-        { name: 'senderAddress', type: 'address' },
-        { name: 'makerAssetAmount', type: 'uint256' },
-        { name: 'takerAssetAmount', type: 'uint256' },
-        { name: 'makerFee', type: 'uint256' },
-        { name: 'takerFee', type: 'uint256' },
-        { name: 'expirationTimeSeconds', type: 'uint256' },
-        { name: 'salt', type: 'uint256' },
-        { name: 'makerAssetData', type: 'bytes' },
-        { name: 'takerAssetData', type: 'bytes' },
-    ],
-};
-
 export const orderHashUtils = {
     /**
      * Checks if the supplied hex encoded order hash is valid.
@@ -45,7 +27,7 @@ export const orderHashUtils = {
     /**
      * Computes the orderHash for a supplied order.
      * @param   order   An object that conforms to the Order or SignedOrder interface definitions.
-     * @return  The resulting orderHash from hashing the supplied order.
+     * @return  Hex encoded string orderHash from hashing the supplied order.
      */
     getOrderHashHex(order: SignedOrder | Order): string {
         try {
@@ -64,27 +46,12 @@ export const orderHashUtils = {
         return orderHashHex;
     },
     /**
-     * Computes the orderHash for a supplied order and returns it as a Buffer
+     * Computes the orderHash for a supplied order
      * @param   order   An object that conforms to the Order or SignedOrder interface definitions.
-     * @return  The resulting orderHash from hashing the supplied order as a Buffer
+     * @return  A Buffer containing the resulting orderHash from hashing the supplied order
      */
     getOrderHashBuffer(order: SignedOrder | Order): Buffer {
-        const normalizedOrder = _.mapValues(order, value => {
-            return _.isObject(value) ? value.toString() : value;
-        });
-        const typedData = {
-            types: {
-                EIP712Domain: EIP712_DOMAIN_SCHEMA.parameters,
-                Order: EIP712_ORDER_SCHEMA.parameters,
-            },
-            domain: {
-                name: EIP712_DOMAIN_NAME,
-                version: EIP712_DOMAIN_VERSION,
-                verifyingContract: order.exchangeAddress,
-            },
-            message: normalizedOrder,
-            primaryType: EIP712_ORDER_SCHEMA.name,
-        };
+        const typedData = eip712Utils.createOrderTypedData(order);
         const orderHashBuff = signTypedDataUtils.signTypedDataHash(typedData);
         return orderHashBuff;
     },
diff --git a/packages/order-utils/src/signature_utils.ts b/packages/order-utils/src/signature_utils.ts
index 2d7fcfc9e..8c92b87dd 100644
--- a/packages/order-utils/src/signature_utils.ts
+++ b/packages/order-utils/src/signature_utils.ts
@@ -1,5 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
-import { ECSignature, Order, SignatureType, ValidatorSignature } from '@0xproject/types';
+import { ECSignature, Order, SignatureType, SignedOrder, ValidatorSignature } from '@0xproject/types';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import { Provider } from 'ethereum-types';
 import * as ethUtil from 'ethereumjs-util';
@@ -7,11 +7,11 @@ import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
 import { assert } from './assert';
-import { EIP712_DOMAIN_NAME, EIP712_DOMAIN_SCHEMA, EIP712_DOMAIN_VERSION } from './constants';
+import { eip712Utils } from './eip712_utils';
 import { ExchangeContract } from './generated_contract_wrappers/exchange';
 import { IValidatorContract } from './generated_contract_wrappers/i_validator';
 import { IWalletContract } from './generated_contract_wrappers/i_wallet';
-import { EIP712_ORDER_SCHEMA, orderHashUtils } from './order_hash';
+import { orderHashUtils } from './order_hash';
 import { OrderError } from './types';
 import { utils } from './utils';
 
@@ -195,53 +195,45 @@ export const signatureUtils = {
     },
     /**
      * Signs an order and returns its elliptic curve signature and signature type. First `eth_signTypedData` is requested
-     * then a fallback to `eth_sign` if not available on this provider.
+     * then a fallback to `eth_sign` if not available on the supplied provider.
      * @param   order The Order to sign.
      * @param   signerAddress   The hex encoded Ethereum address you wish to sign it with. This address
-     *          must be available via the Provider supplied to 0x.js.
-     * @return  A hex encoded string containing the Elliptic curve signature generated by signing the orderHash and the Signature Type.
+     *          must be available via the supplied Provider.
+     * @return  A SignedOrder containing the order and Elliptic curve signature with Signature Type.
      */
-    async ecSignOrderAsync(provider: Provider, order: Order, signerAddress: string): Promise<string> {
+    async ecSignOrderAsync(provider: Provider, order: Order, signerAddress: string): Promise<SignedOrder> {
         try {
-            const signatureHex = signatureUtils.ecSignTypedDataOrderAsync(provider, order, signerAddress);
-            return signatureHex;
+            const signedOrder = signatureUtils.ecSignTypedDataOrderAsync(provider, order, signerAddress);
+            return signedOrder;
         } catch (err) {
             // Fallback to using EthSign when ethSignTypedData is not supported
             const orderHash = orderHashUtils.getOrderHashHex(order);
             const signatureHex = await signatureUtils.ecSignHashAsync(provider, orderHash, signerAddress);
-            return signatureHex;
+            const signedOrder = {
+                ...order,
+                signature: signatureHex,
+            };
+            return signedOrder;
         }
     },
     /**
      * Signs an order using `eth_signTypedData` and returns its elliptic curve signature and signature type.
      * @param   order The Order to sign.
      * @param   signerAddress   The hex encoded Ethereum address you wish to sign it with. This address
-     *          must be available via the Provider supplied to 0x.js.
-     * @return  A hex encoded string containing the Elliptic curve signature generated by signing the order with `eth_signTypedData`
-     *          and the Signature Type.
+     *          must be available via the supplied Provider.
+     * @return  A SignedOrder containing the order and Elliptic curve signature with Signature Type.
      */
-    async ecSignTypedDataOrderAsync(provider: Provider, order: Order, signerAddress: string): Promise<string> {
+    async ecSignTypedDataOrderAsync(provider: Provider, order: Order, signerAddress: string): Promise<SignedOrder> {
         assert.isWeb3Provider('provider', provider);
         assert.isETHAddressHex('signerAddress', signerAddress);
         const web3Wrapper = new Web3Wrapper(provider);
         await assert.isSenderAddressAsync('signerAddress', signerAddress, web3Wrapper);
+        // Detect if Metamask to transition users to the MetamaskSubprovider
+        if ((provider as any).isMetaMask) {
+            throw new Error('Unsupported Provider, please use MetamaskSubprovider.');
+        }
         const normalizedSignerAddress = signerAddress.toLowerCase();
-        const normalizedOrder = _.mapValues(order, value => {
-            return _.isObject(value) ? value.toString() : value;
-        });
-        const typedData = {
-            types: {
-                EIP712Domain: EIP712_DOMAIN_SCHEMA.parameters,
-                Order: EIP712_ORDER_SCHEMA.parameters,
-            },
-            domain: {
-                name: EIP712_DOMAIN_NAME,
-                version: EIP712_DOMAIN_VERSION,
-                verifyingContract: order.exchangeAddress,
-            },
-            message: normalizedOrder,
-            primaryType: 'Order',
-        };
+        const typedData = eip712Utils.createOrderTypedData(order);
         const signature = await web3Wrapper.signTypedDataAsync(normalizedSignerAddress, typedData);
         const ecSignatureRSV = parseSignatureHexAsRSV(signature);
         const signatureBuffer = Buffer.concat([
@@ -251,14 +243,16 @@ export const signatureUtils = {
             ethUtil.toBuffer(SignatureType.EIP712),
         ]);
         const signatureHex = `0x${signatureBuffer.toString('hex')}`;
-        return signatureHex;
+        return {
+            ...order,
+            signature: signatureHex,
+        };
     },
     /**
      * Signs a hash and returns its elliptic curve signature and signature type.
-     * This method currently supports TestRPC, Geth and Parity above and below V1.6.6
      * @param   msgHash       Hex encoded message to sign.
      * @param   signerAddress   The hex encoded Ethereum address you wish to sign it with. This address
-     *          must be available via the Provider supplied to 0x.js.
+     *          must be available via the supplied Provider.
      * @return  A hex encoded string containing the Elliptic curve signature generated by signing the msgHash and the Signature Type.
      */
     async ecSignHashAsync(provider: Provider, msgHash: string, signerAddress: string): Promise<string> {
@@ -268,6 +262,10 @@ export const signatureUtils = {
         const web3Wrapper = new Web3Wrapper(provider);
         await assert.isSenderAddressAsync('signerAddress', signerAddress, web3Wrapper);
         const normalizedSignerAddress = signerAddress.toLowerCase();
+        // Detect if Metamask to transition users to the MetamaskSubprovider
+        if ((provider as any).isMetaMask) {
+            throw new Error('Unsupported Provider, please use MetamaskSubprovider.');
+        }
 
         const signature = await web3Wrapper.signMessageAsync(normalizedSignerAddress, msgHash);
         const prefixedMsgHashHex = signatureUtils.addSignedMessagePrefix(msgHash);
diff --git a/packages/order-utils/test/eip712_utils_test.ts b/packages/order-utils/test/eip712_utils_test.ts
new file mode 100644
index 000000000..dc76595db
--- /dev/null
+++ b/packages/order-utils/test/eip712_utils_test.ts
@@ -0,0 +1,44 @@
+import { BigNumber } from '@0xproject/utils';
+import * as chai from 'chai';
+import 'mocha';
+
+import { constants } from '../src/constants';
+import { eip712Utils } from '../src/eip712_utils';
+
+import { chaiSetup } from './utils/chai_setup';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('EIP712 Utils', () => {
+    describe('createTypedData', () => {
+        it('adds in the EIP712DomainSeparator', () => {
+            const primaryType = 'Test';
+            const typedData = eip712Utils.createTypedData(
+                primaryType,
+                { Test: [{ name: 'testValue', type: 'uint256' }] },
+                { testValue: '1' },
+                constants.NULL_ADDRESS,
+            );
+            expect(typedData.domain).to.not.be.undefined();
+            expect(typedData.types.EIP712Domain).to.not.be.undefined();
+            const domainObject = typedData.domain;
+            expect(domainObject.name).to.eq(constants.EIP712_DOMAIN_NAME);
+            expect(typedData.primaryType).to.eq(primaryType);
+        });
+    });
+    describe('createTypedData', () => {
+        it('adds in the EIP712DomainSeparator', () => {
+            const typedData = eip712Utils.createZeroExTransactionTypedData(
+                {
+                    salt: new BigNumber('0'),
+                    data: constants.NULL_BYTES,
+                    signerAddress: constants.NULL_BYTES,
+                },
+                constants.NULL_ADDRESS,
+            );
+            expect(typedData.primaryType).to.eq(constants.EIP712_ZEROEX_TRANSACTION_SCHEMA.name);
+            expect(typedData.types.EIP712Domain).to.not.be.undefined();
+        });
+    });
+});
diff --git a/packages/order-utils/test/order_hash_test.ts b/packages/order-utils/test/order_hash_test.ts
index 3fdbbad21..fe44218d6 100644
--- a/packages/order-utils/test/order_hash_test.ts
+++ b/packages/order-utils/test/order_hash_test.ts
@@ -35,6 +35,20 @@ describe('Order hashing', () => {
             const orderHash = orderHashUtils.getOrderHashHex(order);
             expect(orderHash).to.be.equal(expectedOrderHash);
         });
+        it('calculates the order hash if amounts are strings', async () => {
+            // It's common for developers using javascript to provide the amounts
+            // as strings. Since we eventually toString() the BigNumber
+            // before encoding we should result in the same orderHash in this scenario
+            // tslint:disable-next-line:no-unnecessary-type-assertion
+            const orderHash = orderHashUtils.getOrderHashHex({
+                ...order,
+                makerAssetAmount: '0',
+                takerAssetAmount: '0',
+                makerFee: '0',
+                takerFee: '0',
+            } as any);
+            expect(orderHash).to.be.equal(expectedOrderHash);
+        });
         it('throws a readable error message if taker format is invalid', async () => {
             const orderWithInvalidtakerFormat = {
                 ...order,
diff --git a/packages/order-utils/test/signature_utils_test.ts b/packages/order-utils/test/signature_utils_test.ts
index 03354cd65..7f6987f6a 100644
--- a/packages/order-utils/test/signature_utils_test.ts
+++ b/packages/order-utils/test/signature_utils_test.ts
@@ -152,14 +152,14 @@ describe('Signature utils', () => {
                 ethUtil.toBuffer(SignatureType.EIP712),
             ]);
             const signatureHex = `0x${signatureBuffer.toString('hex')}`;
-            const eip712Signature = await signatureUtils.ecSignOrderAsync(provider, order, makerAddress);
+            const signedOrder = await signatureUtils.ecSignOrderAsync(provider, order, makerAddress);
             const isValidSignature = await signatureUtils.isValidSignatureAsync(
                 provider,
                 orderHashHex,
-                eip712Signature,
+                signedOrder.signature,
                 makerAddress,
             );
-            expect(signatureHex).to.eq(eip712Signature);
+            expect(signatureHex).to.eq(signedOrder.signature);
             expect(isValidSignature).to.eq(true);
         });
     });
@@ -238,6 +238,51 @@ describe('Signature utils', () => {
             expect(isValidSignature).to.be.true();
         });
     });
+    describe('#ecSignTypedDataOrderAsync', () => {
+        let makerAddress: string;
+        const fakeExchangeContractAddress = '0x1dc4c1cefef38a777b15aa20260a54e584b16c48';
+        let order: Order;
+        before(async () => {
+            const availableAddreses = await web3Wrapper.getAvailableAddressesAsync();
+            makerAddress = availableAddreses[0];
+            order = {
+                makerAddress,
+                takerAddress: constants.NULL_ADDRESS,
+                senderAddress: constants.NULL_ADDRESS,
+                feeRecipientAddress: constants.NULL_ADDRESS,
+                makerAssetData: constants.NULL_ADDRESS,
+                takerAssetData: constants.NULL_ADDRESS,
+                exchangeAddress: fakeExchangeContractAddress,
+                salt: new BigNumber(0),
+                makerFee: new BigNumber(0),
+                takerFee: new BigNumber(0),
+                makerAssetAmount: new BigNumber(0),
+                takerAssetAmount: new BigNumber(0),
+                expirationTimeSeconds: new BigNumber(0),
+            };
+        });
+        it('should return the correct Signature for signatureHex concatenated as R + S + V', async () => {
+            const expectedSignature =
+                '0x1cd472c439833774b55d248c31b6585f21aea1b9363ebb4ec58549e46b62eb5a6f696f5781f62de008ee7f77650ef940d99c97ec1dee67b3f5cea1bbfdfeb2eba602';
+            const fakeProvider = {
+                async sendAsync(payload: JSONRPCRequestPayload, callback: JSONRPCErrorCallback): Promise<void> {
+                    if (payload.method === 'eth_signTypedData') {
+                        const [address, typedData] = payload.params;
+                        const signature = await web3Wrapper.signTypedDataAsync(address, typedData);
+                        callback(null, {
+                            id: 42,
+                            jsonrpc: '2.0',
+                            result: signature,
+                        });
+                    } else {
+                        callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });
+                    }
+                },
+            };
+            const signedOrder = await signatureUtils.ecSignTypedDataOrderAsync(fakeProvider, order, makerAddress);
+            expect(signedOrder.signature).to.equal(expectedSignature);
+        });
+    });
     describe('#convertECSignatureToSignatureHex', () => {
         const ecSignature: ECSignature = {
             v: 27,
diff --git a/packages/subproviders/CHANGELOG.json b/packages/subproviders/CHANGELOG.json
index 6a6f7848b..387207b01 100644
--- a/packages/subproviders/CHANGELOG.json
+++ b/packages/subproviders/CHANGELOG.json
@@ -3,11 +3,11 @@
         "version": "2.1.0",
         "changes": [
             {
-                "note": "Add Metamask Subprovider to handle inconsistent JSON RPC behaviour",
+                "note": "Add `MetamaskSubprovider` to handle inconsistent JSON RPC behaviour",
                 "pr": 1102
             },
             {
-                "note": "Add support for eth_signTypedData in Mnemonic, Private and EthLightWallet",
+                "note": "Add support for `eth_signTypedData` in wallets Mnemonic, Private and EthLightWallet",
                 "pr": 1102
             }
         ]
diff --git a/packages/subproviders/src/index.ts b/packages/subproviders/src/index.ts
index 8b5446007..6a8100e68 100644
--- a/packages/subproviders/src/index.ts
+++ b/packages/subproviders/src/index.ts
@@ -48,6 +48,13 @@ export {
     LedgerGetAddressResult,
 } from './types';
 
-export { ECSignature } from '@0xproject/types';
+export {
+    ECSignature,
+    EIP712Object,
+    EIP712ObjectValue,
+    EIP712TypedData,
+    EIP712Types,
+    EIP712Parameter,
+} from '@0xproject/types';
 
 export { JSONRPCRequestPayload, Provider, JSONRPCResponsePayload, JSONRPCErrorCallback } from 'ethereum-types';
diff --git a/packages/subproviders/src/subproviders/eth_lightwallet_subprovider.ts b/packages/subproviders/src/subproviders/eth_lightwallet_subprovider.ts
index e3afeff1b..a1d93ac49 100644
--- a/packages/subproviders/src/subproviders/eth_lightwallet_subprovider.ts
+++ b/packages/subproviders/src/subproviders/eth_lightwallet_subprovider.ts
@@ -1,3 +1,4 @@
+import { EIP712TypedData } from '@0xproject/types';
 import * as lightwallet from 'eth-lightwallet';
 
 import { PartialTxParams } from '../types';
@@ -48,16 +49,16 @@ export class EthLightwalletSubprovider extends BaseWalletSubprovider {
         // Lightwallet loses the chain id information when hex encoding the transaction
         // this results in a different signature on certain networks. PrivateKeyWallet
         // respects this as it uses the parameters passed in
-        let privKey = this._keystore.exportPrivateKey(txParams.from, this._pwDerivedKey);
-        const privKeyWallet = new PrivateKeyWalletSubprovider(privKey);
-        privKey = '';
-        const privKeySignature = await privKeyWallet.signTransactionAsync(txParams);
-        return privKeySignature;
+        let privateKey = this._keystore.exportPrivateKey(txParams.from, this._pwDerivedKey);
+        const privateKeyWallet = new PrivateKeyWalletSubprovider(privateKey);
+        privateKey = '';
+        const privateKeySignature = await privateKeyWallet.signTransactionAsync(txParams);
+        return privateKeySignature;
     }
     /**
      * Sign a personal Ethereum signed message. The signing account will be the account
      * associated with the provided address.
-     * If you've added the this Subprovider to your app's provider, you can simply send an `eth_sign`
+     * If you've added this Subprovider to your app's provider, you can simply send an `eth_sign`
      * or `personal_sign` JSON RPC request, and this method will be called auto-magically.
      * If you are not using this via a ProviderEngine instance, you can call it directly.
      * @param data Hex string message to sign
@@ -65,10 +66,10 @@ export class EthLightwalletSubprovider extends BaseWalletSubprovider {
      * @return Signature hex string (order: rsv)
      */
     public async signPersonalMessageAsync(data: string, address: string): Promise<string> {
-        let privKey = this._keystore.exportPrivateKey(address, this._pwDerivedKey);
-        const privKeyWallet = new PrivateKeyWalletSubprovider(privKey);
-        privKey = '';
-        const result = privKeyWallet.signPersonalMessageAsync(data, address);
+        let privateKey = this._keystore.exportPrivateKey(address, this._pwDerivedKey);
+        const privateKeyWallet = new PrivateKeyWalletSubprovider(privateKey);
+        privateKey = '';
+        const result = privateKeyWallet.signPersonalMessageAsync(data, address);
         return result;
     }
     /**
@@ -80,11 +81,11 @@ export class EthLightwalletSubprovider extends BaseWalletSubprovider {
      * @param data the typed data object
      * @return Signature hex string (order: rsv)
      */
-    public async signTypedDataAsync(address: string, typedData: any): Promise<string> {
-        let privKey = this._keystore.exportPrivateKey(address, this._pwDerivedKey);
-        const privKeyWallet = new PrivateKeyWalletSubprovider(privKey);
-        privKey = '';
-        const result = privKeyWallet.signTypedDataAsync(address, typedData);
+    public async signTypedDataAsync(address: string, typedData: EIP712TypedData): Promise<string> {
+        let privateKey = this._keystore.exportPrivateKey(address, this._pwDerivedKey);
+        const privateKeyWallet = new PrivateKeyWalletSubprovider(privateKey);
+        privateKey = '';
+        const result = privateKeyWallet.signTypedDataAsync(address, typedData);
         return result;
     }
 }
diff --git a/packages/subproviders/src/subproviders/metamask_subprovider.ts b/packages/subproviders/src/subproviders/metamask_subprovider.ts
index 724edd574..46fc2a9cd 100644
--- a/packages/subproviders/src/subproviders/metamask_subprovider.ts
+++ b/packages/subproviders/src/subproviders/metamask_subprovider.ts
@@ -18,7 +18,7 @@ export class MetamaskSubprovider extends Subprovider {
     private readonly _web3Wrapper: Web3Wrapper;
     private readonly _provider: Provider;
     /**
-     * Instantiates a new SignerSubprovider
+     * Instantiates a new MetamaskSubprovider
      * @param provider Web3 provider that should handle  all user account related requests
      */
     constructor(provider: Provider) {
@@ -83,7 +83,9 @@ export class MetamaskSubprovider extends Subprovider {
             case 'eth_signTypedData_v3':
                 [address, message] = payload.params;
                 try {
-                    // Metamask has namespaced signTypedData to v3 for an indeterminate period of time.
+                    // Metamask supports multiple versions and has namespaced signTypedData to v3 for an indeterminate period of time.
+                    // eth_signTypedData is mapped to an older implementation before the spec was finalized.
+                    // Source: https://github.com/MetaMask/metamask-extension/blob/c49d854b55b3efd34c7fd0414b76f7feaa2eec7c/app/scripts/metamask-controller.js#L1262
                     // and expects message to be serialised as JSON
                     const messageJSON = JSON.stringify(message);
                     const signature = await this._web3Wrapper.sendRawPayloadAsync<string>({
diff --git a/packages/subproviders/src/subproviders/mnemonic_wallet.ts b/packages/subproviders/src/subproviders/mnemonic_wallet.ts
index de99b632a..04a11c7be 100644
--- a/packages/subproviders/src/subproviders/mnemonic_wallet.ts
+++ b/packages/subproviders/src/subproviders/mnemonic_wallet.ts
@@ -1,4 +1,5 @@
 import { assert } from '@0xproject/assert';
+import { EIP712TypedData } from '@0xproject/types';
 import { addressUtils } from '@0xproject/utils';
 import * as bip39 from 'bip39';
 import HDNode = require('hdkey');
@@ -90,10 +91,10 @@ export class MnemonicWalletSubprovider extends BaseWalletSubprovider {
     }
     /**
      * Sign a personal Ethereum signed message. The signing account will be the account
-     * associated with the provided address.
-     * If you've added the MnemonicWalletSubprovider to your app's provider, you can simply send an `eth_sign`
-     * or `personal_sign` JSON RPC request, and this method will be called auto-magically.
-     * If you are not using this via a ProviderEngine instance, you can call it directly.
+     * associated with the provided address. If you've added the MnemonicWalletSubprovider to
+     * your app's provider, you can simply send an `eth_sign` or `personal_sign` JSON RPC request,
+     * and this method will be called auto-magically. If you are not using this via a ProviderEngine
+     * instance, you can call it directly.
      * @param data Hex string message to sign
      * @param address Address of the account to sign with
      * @return Signature hex string (order: rsv)
@@ -109,16 +110,16 @@ export class MnemonicWalletSubprovider extends BaseWalletSubprovider {
         return sig;
     }
     /**
-     * Sign an EIP712 Typed Data message.  The signing account will be the account
-     * associated with the provided address.
-     * If you've added this MnemonicWalletSubprovider to your app's provider, you can simply send an `eth_signTypedData`
-     * JSON RPC request, and this method will be called auto-magically.
-     * If you are not using this via a ProviderEngine instance, you can call it directly.
+     * Sign an EIP712 Typed Data message. The signing account will be the account
+     * associated with the provided address. If you've added this MnemonicWalletSubprovider to
+     * your app's provider, you can simply send an `eth_signTypedData` JSON RPC request, and
+     * this method will be called auto-magically. If you are not using this via a ProviderEngine
+     *  instance, you can call it directly.
      * @param address Address of the account to sign with
      * @param data the typed data object
      * @return Signature hex string (order: rsv)
      */
-    public async signTypedDataAsync(address: string, typedData: any): Promise<string> {
+    public async signTypedDataAsync(address: string, typedData: EIP712TypedData): Promise<string> {
         if (_.isUndefined(typedData)) {
             throw new Error(WalletSubproviderErrors.DataMissingForSignPersonalMessage);
         }
diff --git a/packages/subproviders/src/subproviders/private_key_wallet.ts b/packages/subproviders/src/subproviders/private_key_wallet.ts
index 51409077d..96e4190ed 100644
--- a/packages/subproviders/src/subproviders/private_key_wallet.ts
+++ b/packages/subproviders/src/subproviders/private_key_wallet.ts
@@ -1,4 +1,5 @@
 import { assert } from '@0xproject/assert';
+import { EIP712TypedData } from '@0xproject/types';
 import { signTypedDataUtils } from '@0xproject/utils';
 import EthereumTx = require('ethereumjs-tx');
 import * as ethUtil from 'ethereumjs-util';
@@ -95,7 +96,7 @@ export class PrivateKeyWalletSubprovider extends BaseWalletSubprovider {
      * @param data the typed data object
      * @return Signature hex string (order: rsv)
      */
-    public async signTypedDataAsync(address: string, typedData: any): Promise<string> {
+    public async signTypedDataAsync(address: string, typedData: EIP712TypedData): Promise<string> {
         if (_.isUndefined(typedData)) {
             throw new Error(WalletSubproviderErrors.DataMissingForSignTypedData);
         }
diff --git a/packages/subproviders/src/subproviders/signer.ts b/packages/subproviders/src/subproviders/signer.ts
index 6b519865f..eda7db42e 100644
--- a/packages/subproviders/src/subproviders/signer.ts
+++ b/packages/subproviders/src/subproviders/signer.ts
@@ -14,7 +14,7 @@ import { Subprovider } from './subprovider';
 export class SignerSubprovider extends Subprovider {
     private readonly _web3Wrapper: Web3Wrapper;
     /**
-     * Instantiates a new SignerSubprovider
+     * Instantiates a new SignerSubprovider.
      * @param provider Web3 provider that should handle  all user account related requests
      */
     constructor(provider: Provider) {
diff --git a/packages/subproviders/test/unit/eth_lightwallet_subprovider_test.ts b/packages/subproviders/test/unit/eth_lightwallet_subprovider_test.ts
index 063817a95..49698ce9e 100644
--- a/packages/subproviders/test/unit/eth_lightwallet_subprovider_test.ts
+++ b/packages/subproviders/test/unit/eth_lightwallet_subprovider_test.ts
@@ -73,6 +73,13 @@ describe('EthLightwalletSubprovider', () => {
                 const txHex = await ethLightwalletSubprovider.signTransactionAsync(fixtureData.TX_DATA);
                 expect(txHex).to.be.equal(fixtureData.TX_DATA_SIGNED_RESULT);
             });
+            it('signs an EIP712 sign typed data message', async () => {
+                const signature = await ethLightwalletSubprovider.signTypedDataAsync(
+                    fixtureData.TEST_RPC_ACCOUNT_0,
+                    fixtureData.EIP712_TEST_TYPED_DATA,
+                );
+                expect(signature).to.be.equal(fixtureData.EIP712_TEST_TYPED_DATA_SIGNED_RESULT);
+            });
         });
     });
     describe('calls through a provider', () => {
@@ -129,6 +136,20 @@ describe('EthLightwalletSubprovider', () => {
                 });
                 provider.sendAsync(payload, callback);
             });
+            it('signs an EIP712 sign typed data message with eth_signTypedData', (done: DoneCallback) => {
+                const payload = {
+                    jsonrpc: '2.0',
+                    method: 'eth_signTypedData',
+                    params: [fixtureData.TEST_RPC_ACCOUNT_0, fixtureData.EIP712_TEST_TYPED_DATA],
+                    id: 1,
+                };
+                const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
+                    expect(err).to.be.a('null');
+                    expect(response.result).to.be.equal(fixtureData.EIP712_TEST_TYPED_DATA_SIGNED_RESULT);
+                    done();
+                });
+                provider.sendAsync(payload, callback);
+            });
         });
         describe('failure cases', () => {
             it('should throw if `data` param not hex when calling eth_sign', (done: DoneCallback) => {
diff --git a/packages/types/CHANGELOG.json b/packages/types/CHANGELOG.json
index 65dd75101..53e1f3716 100644
--- a/packages/types/CHANGELOG.json
+++ b/packages/types/CHANGELOG.json
@@ -5,6 +5,10 @@
             {
                 "note": "Added `EIP712Parameter` `EIP712Types` `EIP712TypedData` for EIP712 signing",
                 "pr": 1102
+            },
+            {
+                "note": "Added `ZeroExTransaction` type for Exchange executeTransaction",
+                "pr": 1102
             }
         ]
     },
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index d57bdfb6f..6bc966ba1 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -42,6 +42,15 @@ export interface SignedOrder extends Order {
 }
 
 /**
+ * ZeroExTransaction for use with 0x Exchange executeTransaction
+ */
+export interface ZeroExTransaction {
+    salt: BigNumber;
+    signerAddress: string;
+    data: string;
+}
+
+/**
  * Elliptic Curve signature
  */
 export interface ECSignature {
@@ -598,9 +607,16 @@ export interface EIP712Parameter {
 export interface EIP712Types {
     [key: string]: EIP712Parameter[];
 }
+
+export type EIP712ObjectValue = string | number | EIP712Object;
+
+export interface EIP712Object {
+    [key: string]: EIP712ObjectValue;
+}
+
 export interface EIP712TypedData {
     types: EIP712Types;
-    domain: any;
-    message: any;
+    domain: EIP712Object;
+    message: EIP712Object;
     primaryType: string;
 }
diff --git a/packages/utils/src/sign_typed_data_utils.ts b/packages/utils/src/sign_typed_data_utils.ts
index b72fd099b..657a59ed0 100644
--- a/packages/utils/src/sign_typed_data_utils.ts
+++ b/packages/utils/src/sign_typed_data_utils.ts
@@ -1,7 +1,8 @@
 import * as ethUtil from 'ethereumjs-util';
 import * as ethers from 'ethers';
+import * as _ from 'lodash';
 
-import { EIP712TypedData, EIP712Types } from '@0xproject/types';
+import { EIP712Object, EIP712ObjectValue, EIP712TypedData, EIP712Types } from '@0xproject/types';
 
 export const signTypedDataUtils = {
     /**
@@ -42,32 +43,40 @@ export const signTypedDataUtils = {
         }
         return result;
     },
-    _encodeData(primaryType: string, data: any, types: EIP712Types): string {
+    _encodeData(primaryType: string, data: EIP712Object, types: EIP712Types): string {
         const encodedTypes = ['bytes32'];
-        const encodedValues = [signTypedDataUtils._typeHash(primaryType, types)];
+        const encodedValues: Array<Buffer | EIP712ObjectValue> = [signTypedDataUtils._typeHash(primaryType, types)];
         for (const field of types[primaryType]) {
-            let value = data[field.name];
+            const value = data[field.name];
             if (field.type === 'string' || field.type === 'bytes') {
-                value = ethUtil.sha3(value);
+                const hashValue = ethUtil.sha3(value as string);
                 encodedTypes.push('bytes32');
-                encodedValues.push(value);
+                encodedValues.push(hashValue);
             } else if (types[field.type] !== undefined) {
                 encodedTypes.push('bytes32');
-                value = ethUtil.sha3(signTypedDataUtils._encodeData(field.type, value, types));
-                encodedValues.push(value);
+                const hashValue = ethUtil.sha3(
+                    // tslint:disable-next-line:no-unnecessary-type-assertion
+                    signTypedDataUtils._encodeData(field.type, value as EIP712Object, types),
+                );
+                encodedValues.push(hashValue);
             } else if (field.type.lastIndexOf(']') === field.type.length - 1) {
                 throw new Error('Arrays currently unimplemented in encodeData');
             } else {
                 encodedTypes.push(field.type);
-                encodedValues.push(value);
+                const normalizedValue = signTypedDataUtils._normalizeValue(field.type, value);
+                encodedValues.push(normalizedValue);
             }
         }
         return ethers.utils.defaultAbiCoder.encode(encodedTypes, encodedValues);
     },
+    _normalizeValue(type: string, value: any): EIP712ObjectValue {
+        const normalizedValue = type === 'uint256' && _.isObject(value) && value.isBigNumber ? value.toString() : value;
+        return normalizedValue;
+    },
     _typeHash(primaryType: string, types: EIP712Types): Buffer {
         return ethUtil.sha3(signTypedDataUtils._encodeType(primaryType, types));
     },
-    _structHash(primaryType: string, data: any, types: EIP712Types): Buffer {
+    _structHash(primaryType: string, data: EIP712Object, types: EIP712Types): Buffer {
         return ethUtil.sha3(signTypedDataUtils._encodeData(primaryType, data, types));
     },
 };
diff --git a/packages/web3-wrapper/src/web3_wrapper.ts b/packages/web3-wrapper/src/web3_wrapper.ts
index df6879a48..034bafb5f 100644
--- a/packages/web3-wrapper/src/web3_wrapper.ts
+++ b/packages/web3-wrapper/src/web3_wrapper.ts
@@ -318,9 +318,9 @@ export class Web3Wrapper {
      * Sign an EIP712 typed data message with a specific address's private key (`eth_signTypedData`)
      * @param address Address of signer
      * @param typedData Typed data message to sign
-     * @returns Signature string (might be VRS or RSV depending on the Signer)
+     * @returns Signature string (as RSV)
      */
-    public async signTypedDataAsync(address: string, typedData: object): Promise<string> {
+    public async signTypedDataAsync(address: string, typedData: any): Promise<string> {
         assert.isETHAddressHex('address', address);
         assert.doesConformToSchema('typedData', typedData, schemas.eip712TypedData);
         const signData = await this.sendRawPayloadAsync<string>({