Merge pull request #59 from 0xProject/addParamReturnComments

Add @param and @return comments to public methods

4 files changed, 139 insertions, 24 deletions

diff --git a/src/0x.js.ts b/src/0x.js.ts
index 143ad8e1f..b1e4e25ff 100644
--- a/src/0x.js.ts
+++ b/src/0x.js.ts
@@ -23,6 +23,11 @@ import {orderSchema} from './schemas/order_schemas';
 bigNumberConfigs.configure();
 
 export class ZeroEx {
+    /**
+     * When creating an order without a specified taker or feeRecipient you must supply the Solidity
+     * address null type (as opposed to Javascripts `null`, `undefined` or empty string). We expose
+     * this constant for your convenience.
+     */
     public static NULL_ADDRESS = constants.NULL_ADDRESS;
 
     public exchange: ExchangeWrapper;
@@ -32,6 +37,10 @@ export class ZeroEx {
     /**
      * Verifies that the elliptic curve signature `signature` was generated
      * by signing `dataHex` with the private key corresponding to the `signerAddressHex` address.
+     * @param   dataHex          The hex encoded data signed by the supplied signature.
+     * @param   signature        A JS object containing the elliptic curve signature parameters.
+     * @param   signerAddressHex The hex encoded address that signed the dataHex, producing the supplied signature.
+     * @return  Whether the signature is valid for the supplied signerAddressHex and dataHex.
      */
     public static isValidSignature(dataHex: string, signature: ECSignature, signerAddressHex: string): boolean {
         assert.isHexString('dataHex', dataHex);
@@ -53,9 +62,10 @@ export class ZeroEx {
         }
     }
     /**
-     * Generates pseudo-random 256 bit salt.
-     * The salt is used to ensure that the 0x order generated has a unique orderHash that does
-     * not collide with any other outstanding orders.
+     * Generates a pseudo-random 256-bit salt.
+     * The salt can be included in an 0x order, ensuring that the order generates a unique orderHash
+     * 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 {
         // BigNumber.random returns a pseudo-random number between 0 & 1 with a passed in number of decimal places.
@@ -68,6 +78,9 @@ export class ZeroEx {
     /**
      * Checks if the supplied hex encoded order hash is valid.
      * Note: Valid means it has the expected format, not that an order with the orderHash exists.
+     * Use this method when processing orderHashes submitted as user input.
+     * @param   orderHashHex    Hex encoded orderHash.
+     * @return  Whether the supplied orderHashHex has the expected format.
      */
     public static isValidOrderHash(orderHashHex: string): boolean {
         // Since this method can be called to check if any arbitrary string conforms to an orderHash's
@@ -80,12 +93,15 @@ export class ZeroEx {
      * A unit amount is defined as the amount of a token above the specified decimal places (integer part).
      * E.g: If a currency has 18 decimal places, 1e18 or one quintillion of the currency is equivalent
      * to 1 unit.
+     * @param   amount      The amount in baseUnits that you would like converted to units.
+     * @param   decimals    The number of decimal places the unit amount has.
+     * @return  The amount in units.
      */
-    public static toUnitAmount(amount: BigNumber.BigNumber, numDecimals: number): BigNumber.BigNumber {
+    public static toUnitAmount(amount: BigNumber.BigNumber, decimals: number): BigNumber.BigNumber {
         assert.isBigNumber('amount', amount);
-        assert.isNumber('numDecimals', numDecimals);
+        assert.isNumber('decimals', decimals);
 
-        const aUnit = new BigNumber(10).pow(numDecimals);
+        const aUnit = new BigNumber(10).pow(decimals);
         const unit = amount.div(aUnit);
         return unit;
     }
@@ -93,15 +109,24 @@ export class ZeroEx {
      * A baseUnit is defined as the smallest denomination of a token. An amount expressed in baseUnits
      * is the amount expressed in the smallest denomination.
      * E.g: 1 unit of a token with 18 decimal places is expressed in baseUnits as 1000000000000000000
+     * @param   amount      The amount of units that you would like converted to baseUnits.
+     * @param   decimals    The number of decimal places the unit amount has.
+     * @return  The amount in baseUnits.
      */
-    public static toBaseUnitAmount(amount: BigNumber.BigNumber, numDecimals: number): BigNumber.BigNumber {
+    public static toBaseUnitAmount(amount: BigNumber.BigNumber, decimals: number): BigNumber.BigNumber {
         assert.isBigNumber('amount', amount);
-        assert.isNumber('numDecimals', numDecimals);
+        assert.isNumber('decimals', decimals);
 
-        const unit = new BigNumber(10).pow(numDecimals);
+        const unit = new BigNumber(10).pow(decimals);
         const baseUnitAmount = amount.times(unit);
         return baseUnitAmount;
     }
+    /**
+     * Instantiates a new ZeroEx instance that provides the public interface to the 0x.js library.
+     * @param   web3    The Web3.js instance you would like the 0x.js library to use for interacting with
+     *                  the Ethereum network.
+     * @return  An instance of the 0x.js ZeroEx class.
+     */
     constructor(web3: Web3) {
         this.web3Wrapper = new Web3Wrapper(web3);
         this.token = new TokenWrapper(this.web3Wrapper);
@@ -109,7 +134,9 @@ export class ZeroEx {
         this.tokenRegistry = new TokenRegistryWrapper(this.web3Wrapper);
     }
     /**
-     * Sets a new provider for the web3 instance used by 0x.js
+     * Sets a new provider for the web3 instance used by 0x.js. Updating the provider will stop all
+     * subscriptions so you will need to re-subscribe to all events relevant to your app after this call.
+     * @param   provider    The Web3.Provider you would like the 0x.js library to use from now on.
      */
     public async setProviderAsync(provider: Web3.Provider) {
         this.web3Wrapper.setProvider(provider);
@@ -118,14 +145,17 @@ export class ZeroEx {
         this.token.invalidateContractInstances();
     }
     /**
-     * Get addresses via the supplied web3 instance available for sending transactions.
+     * Get addresses available throught the supplied web3 instance available for sending transactions.
+     * @return  An array of Ethereum addresses available.
      */
     public async getAvailableAddressesAsync(): Promise<string[]> {
         const availableAddresses = await this.web3Wrapper.getAvailableAddressesAsync();
         return availableAddresses;
     }
     /**
-     * Computes the orderHash for a given order and returns it as a hex encoded string.
+     * Computes the orderHash for a supplied order.
+     * @param   order   A JS object that conforms to the Order or SignedOrder interface definitions.
+     * @return  The resulting orderHash from hashing the supplied order.
      */
     public async getOrderHashHexAsync(order: Order|SignedOrder): Promise<string> {
         assert.doesConformToSchema('order', order, orderSchema);
@@ -137,6 +167,10 @@ export class ZeroEx {
     /**
      * Signs an orderHash and returns it's elliptic curve signature.
      * This method currently supports TestRPC, Geth and Parity above and below V1.6.6
+     * @param   orderHashHex    Hex encoded orderHash to sign.
+     * @param   signerAddress   The hex encoded Ethereum address you wish to sign it with. This address
+     *          must be available via the Web3.Provider supplied to 0x.js.
+     * @return  A JS object containing the Elliptic curve signature parameters generated by signing the orderHashHex.
      */
     public async signOrderHashAsync(orderHashHex: string, signerAddress: string): Promise<ECSignature> {
         assert.isHexString('orderHashHex', orderHashHex);
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 65a873a9f..76f86e464 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -79,6 +79,9 @@ export class ExchangeWrapper extends ContractWrapper {
      * Returns the unavailable takerAmount of an order. Unavailable amount is defined as the total
      * amount that has been filled or cancelled. The remaining takerAmount can be calculated by
      * subtracting the unavailable amount from the total order takerAmount.
+     * @param   orderHashHex    The hex encoded orderHash for which you would like to retrieve the
+     *                          unavailable takerAmount.
+     * @return  The amount of the order (in taker tokens) that has either been filled or canceled.
      */
     public async getUnavailableTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
         assert.isValidOrderHash('orderHashHex', orderHashHex);
@@ -91,6 +94,8 @@ export class ExchangeWrapper extends ContractWrapper {
     }
     /**
      * Retrieve the takerAmount of an order that has already been filled.
+     * @param   orderHashHex    The hex encoded orderHash for which you would like to retrieve the filled takerAmount.
+     * @return  The amount of the order (in taker tokens) that has already been filled.
      */
     public async getFilledTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
         assert.isValidOrderHash('orderHashHex', orderHashHex);
@@ -103,6 +108,9 @@ export class ExchangeWrapper extends ContractWrapper {
     }
     /**
      * Retrieve the takerAmount of an order that has been cancelled.
+     * @param   orderHashHex    The hex encoded orderHash for which you would like to retrieve the
+     *                          cancelled takerAmount.
+     * @return  The amount of the order (in taker tokens) that has been cancelled.
      */
     public async getCanceledTakerAmountAsync(orderHashHex: string): Promise<BigNumber.BigNumber> {
         assert.isValidOrderHash('orderHashHex', orderHashHex);
@@ -119,7 +127,13 @@ export class ExchangeWrapper extends ContractWrapper {
      * could arise where a users balance or allowance changes before the fillOrder executes. Because of this,
      * we allow you to specify `shouldCheckTransfer`. If true, the smart contract will not throw if while
      * executing, the parties do not have sufficient balances/allowances, preserving gas costs. Setting it to
-     * false forgoes this check and causes the smart contract to throw instead.
+     * false forgoes this check and causes the smart contract to throw (using all the gas supplied) instead.
+     * @param   signedOrder             A JS object that conforms to the SignedOrder interface.
+     * @param   takerTokenFillAmount    The amount of the order (in taker tokens baseUnits) that you wish to fill.
+     * @param   shouldCheckTransfer     Whether or not you wish for the contract call to throw if upon
+     *                                  execution the tokens cannot be transferred.
+     * @param   takerAddress            The user Ethereum address who would like to fill this order.
+     *                                  Must be available via the supplied Web3.Provider passed to 0x.js.
      */
     public async fillOrderAsync(signedOrder: SignedOrder, takerTokenFillAmount: BigNumber.BigNumber,
                                 shouldCheckTransfer: boolean, takerAddress: string): Promise<void> {
@@ -164,6 +178,15 @@ export class ExchangeWrapper extends ContractWrapper {
      * Sequentially and atomically fills signedOrders up to the specified takerTokenFillAmount.
      * If the fill amount is reached - it succeeds and does not fill the rest of the orders.
      * If fill amount is not reached - it fills as much of the fill amount as possible and succeeds.
+     * @param   signedOrders            The array of signedOrders that you would like to fill until
+     *                                  takerTokenFillAmount is reached.
+     * @param   takerTokenFillAmount    The total amount of the takerTokens you would like to fill.
+     * @param   shouldCheckTransfer     Whether or not you wish for the contract call to throw if upon
+     *                                  execution any of the tokens cannot be transferred. If set to false,
+     *                                  the call will continue to fill subsequent signedOrders even when
+     *                                  some cannot be filled.
+     * @param   takerAddress            The user Ethereum address who would like to fill these orders.
+     *                                  Must be available via the supplied Web3.Provider passed to 0x.js.
      */
     public async fillOrdersUpToAsync(signedOrders: SignedOrder[], takerTokenFillAmount: BigNumber.BigNumber,
                                      shouldCheckTransfer: boolean, takerAddress: string): Promise<void> {
@@ -228,6 +251,13 @@ export class ExchangeWrapper extends ContractWrapper {
      * Executes multiple fills atomically in a single transaction.
      * If shouldCheckTransfer is set to true, it will continue filling subsequent orders even when earlier ones fail.
      * When shouldCheckTransfer is set to false, if any fill fails, the entire batch fails.
+     * @param   orderFillRequests       An array of JS objects that conform to the OrderFillRequest interface.
+     * @param   shouldCheckTransfer     Whether or not you wish for the contract call to throw if upon
+     *                                  execution any of the tokens cannot be transferred. If set to false,
+     *                                  the call will continue to fill subsequent signedOrders even when some
+     *                                  cannot be filled.
+     * @param   takerAddress            The user Ethereum address who would like to fill these orders.
+     *                                  Must be available via the supplied Web3.Provider passed to 0x.js.
      */
     public async batchFillOrderAsync(orderFillRequests: OrderFillRequest[],
                                      shouldCheckTransfer: boolean, takerAddress: string): Promise<void> {
@@ -287,25 +317,30 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Attempts to fill a specific amount of an order. If the entire amount specified cannot be filled,
      * the fill order is abandoned.
+     * @param   signedOrder             A JS object that conforms to the SignedOrder interface. The
+     *                                  signedOrder you wish to fill.
+     * @param   takerTokenFillAmount    The total amount of the takerTokens you would like to fill.
+     * @param   takerAddress            The user Ethereum address who would like to fill this order.
+     *                                  Must be available via the supplied Web3.Provider passed to 0x.js.
      */
-    public async fillOrKillOrderAsync(signedOrder: SignedOrder, fillTakerAmount: BigNumber.BigNumber,
-                                      takerAddress: string) {
+    public async fillOrKillOrderAsync(signedOrder: SignedOrder, takerTokenFillAmount: BigNumber.BigNumber,
+                                      takerAddress: string): Promise<void> {
         assert.doesConformToSchema('signedOrder', signedOrder, signedOrderSchema);
-        assert.isBigNumber('fillTakerAmount', fillTakerAmount);
+        assert.isBigNumber('takerTokenFillAmount', takerTokenFillAmount);
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this.web3Wrapper);
 
         const exchangeInstance = await this.getExchangeContractAsync();
-        await this.validateFillOrderAndThrowIfInvalidAsync(signedOrder, fillTakerAmount, takerAddress);
+        await this.validateFillOrderAndThrowIfInvalidAsync(signedOrder, takerTokenFillAmount, takerAddress);
 
         await this.validateFillOrKillOrderAndThrowIfInvalidAsync(signedOrder, exchangeInstance.address,
-                                                                 fillTakerAmount);
+                                                                 takerTokenFillAmount);
 
         const [orderAddresses, orderValues] = ExchangeWrapper.getOrderAddressesAndValues(signedOrder);
 
         const gas = await exchangeInstance.fillOrKill.estimateGas(
             orderAddresses,
             orderValues,
-            fillTakerAmount,
+            takerTokenFillAmount,
             signedOrder.ecSignature.v,
             signedOrder.ecSignature.r,
             signedOrder.ecSignature.s,
@@ -316,7 +351,7 @@ export class ExchangeWrapper extends ContractWrapper {
         const response: ContractResponse = await exchangeInstance.fillOrKill(
             orderAddresses,
             orderValues,
-            fillTakerAmount,
+            takerTokenFillAmount,
             signedOrder.ecSignature.v,
             signedOrder.ecSignature.r,
             signedOrder.ecSignature.s,
@@ -330,9 +365,12 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Batch version of fillOrKill. Allows a taker to specify a batch of orders that will either be atomically
      * filled (each to the specified fillAmount) or aborted.
+     * @param   orderFillOrKillRequests     An array of JS objects that conform to the OrderFillOrKillRequest interface.
+     * @param   takerAddress                The user Ethereum address who would like to fill there orders.
+     *                                      Must be available via the supplied Web3.Provider passed to 0x.js.
      */
     public async batchFillOrKillAsync(orderFillOrKillRequests: OrderFillOrKillRequest[],
-                                      takerAddress: string) {
+                                      takerAddress: string): Promise<void> {
         await assert.isSenderAddressAsync('takerAddress', takerAddress, this.web3Wrapper);
         assert.doesConformToSchema('orderFillOrKillRequests', orderFillOrKillRequests, orderFillOrKillRequestsSchema);
         const exchangeInstance = await this.getExchangeContractAsync();
@@ -382,6 +420,9 @@ export class ExchangeWrapper extends ContractWrapper {
     }
     /**
      * Cancel a given fill amount of an order. Cancellations are cumulative.
+     * @param   order                   A JS object that conforms to the Order or SignedOrder interface.
+     *                                  The order you would like to cancel.
+     * @param   takerTokenCancelAmount  The amount (specified in taker tokens) that you would like to cancel.
      */
     public async cancelOrderAsync(
         order: Order|SignedOrder, takerTokenCancelAmount: BigNumber.BigNumber): Promise<void> {
@@ -415,13 +456,16 @@ export class ExchangeWrapper extends ContractWrapper {
     /**
      * Batch version of cancelOrderAsync. Atomically cancels multiple orders in a single transaction.
      * All orders must be from the same maker.
+     * @param   orderCancellationRequests   An array of JS objects that conform to the OrderCancellationRequest
+     *                                      interface.
      */
     public async batchCancelOrderAsync(orderCancellationRequests: OrderCancellationRequest[]): Promise<void> {
         const makers = _.map(orderCancellationRequests, cancellationRequest => cancellationRequest.order.maker);
         assert.hasAtMostOneUniqueValue(makers, ExchangeContractErrs.MULTIPLE_MAKERS_IN_SINGLE_CANCEL_BATCH_DISALLOWED);
         const maker = makers[0];
         await assert.isSenderAddressAsync('maker', maker, this.web3Wrapper);
-        assert.doesConformToSchema('orderCancellationRequests', orderCancellationRequests, orderCancellationRequestsSchema);
+        assert.doesConformToSchema('orderCancellationRequests', orderCancellationRequests,
+                                   orderCancellationRequestsSchema);
         for (const cancellationRequest of orderCancellationRequests) {
             await this.validateCancelOrderAndThrowIfInvalidAsync(
                 cancellationRequest.order, cancellationRequest.takerTokenCancelAmount,
@@ -461,9 +505,15 @@ export class ExchangeWrapper extends ContractWrapper {
     }
     /**
      * Subscribe to an event type emitted by the Exchange smart contract
+     * @param   eventName           The exchange contract event you would like to subscribe to.
+     * @param   subscriptionOpts    Subscriptions options that let you configure the subscription.
+     * @param   indexFilterValues   A JS object where the keys are indexed args returned by the event and
+     *                              the value is the value you are interested in. E.g `{maker: aUserAddressHex}`
+     * @param   callback            The callback that will be called everytime a matching event is found.
      */
     public async subscribeAsync(eventName: ExchangeEvents, subscriptionOpts: SubscriptionOpts,
-                                indexFilterValues: IndexFilterValues, callback: EventCallback) {
+                                indexFilterValues: IndexFilterValues, callback: EventCallback):
+                                Promise<void> {
         const exchangeContract = await this.getExchangeContractAsync();
         let createLogEvent: CreateContractEvent;
         switch (eventName) {
diff --git a/src/contract_wrappers/token_registry_wrapper.ts b/src/contract_wrappers/token_registry_wrapper.ts
index 86bea1c5d..96346a7a4 100644
--- a/src/contract_wrappers/token_registry_wrapper.ts
+++ b/src/contract_wrappers/token_registry_wrapper.ts
@@ -13,6 +13,10 @@ export class TokenRegistryWrapper extends ContractWrapper {
     public invalidateContractInstance(): void {
         delete this.tokenRegistryContractIfExists;
     }
+    /**
+     * Retrieves all the tokens currently listed in the Token Registry smart contract
+     * @return  An array of JS objects that conform to the Token interface.
+     */
     public async getTokensAsync(): Promise<Token[]> {
         const tokenRegistryContract = await this.getTokenRegistryContractAsync();
 
diff --git a/src/contract_wrappers/token_wrapper.ts b/src/contract_wrappers/token_wrapper.ts
index 4412b1299..bb79cac47 100644
--- a/src/contract_wrappers/token_wrapper.ts
+++ b/src/contract_wrappers/token_wrapper.ts
@@ -20,7 +20,9 @@ export class TokenWrapper extends ContractWrapper {
         this.tokenContractsByAddress = {};
     }
     /**
-     * Returns an owner's ERC20 token balance.
+     * Retrieves an owner's ERC20 token balance.
+     * @param   tokenAddress    The hex encoded contract Ethereum address where the ERC20 token is deployed.
+     * @param   ownerAddress    The hex encoded user Ethereum address whose balance you would like to check.
      */
     public async getBalanceAsync(tokenAddress: string, ownerAddress: string): Promise<BigNumber.BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
@@ -36,6 +38,11 @@ export class TokenWrapper extends ContractWrapper {
     /**
      * Sets the spender's allowance to a specified number of baseUnits on behalf of the owner address.
      * Equivalent to the ERC20 spec method `approve`.
+     * @param   tokenAddress        The hex encoded contract Ethereum address where the ERC20 token is deployed.
+     * @param   ownerAddress        The hex encoded user Ethereum address who would like to set an allowance
+     *                              for spenderAddress.
+     * @param   spenderAddress      The hex encoded user Ethereum address who will be able to spend the set allowance.
+     * @param   amountInBaseUnits   The allowance amount you would like to set.
      */
     public async setAllowanceAsync(tokenAddress: string, ownerAddress: string, spenderAddress: string,
                                    amountInBaseUnits: BigNumber.BigNumber): Promise<void> {
@@ -57,6 +64,10 @@ export class TokenWrapper extends ContractWrapper {
     }
     /**
      * Retrieves the owners allowance in baseUnits set to the spender's address.
+     * @param   tokenAddress    The hex encoded contract Ethereum address where the ERC20 token is deployed.
+     * @param   ownerAddress    The hex encoded user Ethereum address whose allowance to spenderAddress
+     *                          you would like to retrieve.
+     * @param   spenderAddress  The hex encoded user Ethereum address who can spend the allowance you are fetching.
      */
     public async getAllowanceAsync(tokenAddress: string, ownerAddress: string, spenderAddress: string) {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
@@ -71,6 +82,8 @@ export class TokenWrapper extends ContractWrapper {
     }
     /**
      * Retrieves the owner's allowance in baseUnits set to the 0x proxy contract.
+     * @param   tokenAddress    The hex encoded contract Ethereum address where the ERC20 token is deployed.
+     * @param   ownerAddress    The hex encoded user Ethereum address whose proxy contract allowance we are retrieving.
      */
     public async getProxyAllowanceAsync(tokenAddress: string, ownerAddress: string) {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
@@ -83,6 +96,10 @@ export class TokenWrapper extends ContractWrapper {
     /**
      * Sets the 0x proxy contract's allowance to a specified number of a tokens' baseUnits on behalf
      * of an owner address.
+     * @param   tokenAddress        The hex encoded contract Ethereum address where the ERC20 token is deployed.
+     * @param   ownerAddress        The hex encoded user Ethereum address who is setting an allowance
+     *                              for the Proxy contract.
+     * @param   amountInBaseUnits   The allowance amount specified in baseUnits.
      */
     public async setProxyAllowanceAsync(tokenAddress: string, ownerAddress: string,
                                         amountInBaseUnits: BigNumber.BigNumber): Promise<void> {
@@ -95,6 +112,10 @@ export class TokenWrapper extends ContractWrapper {
     }
     /**
      * Transfers `amountInBaseUnits` ERC20 tokens from `fromAddress` to `toAddress`.
+     * @param   tokenAddress        The hex encoded contract Ethereum address where the ERC20 token is deployed.
+     * @param   fromAddress         The hex encoded user Ethereum address that will send the funds.
+     * @param   toAddress           The hex encoded user Ethereum address that will receive the funds.
+     * @param   amountInBaseUnits   The amount (specified in baseUnits) of the token to transfer.
      */
     public async transferAsync(tokenAddress: string, fromAddress: string, toAddress: string,
                                amountInBaseUnits: BigNumber.BigNumber): Promise<void> {
@@ -118,6 +139,12 @@ export class TokenWrapper extends ContractWrapper {
      * Transfers `amountInBaseUnits` ERC20 tokens from `fromAddress` to `toAddress`.
      * Requires the fromAddress to have sufficient funds and to have approved an allowance of
      * `amountInBaseUnits` for senderAddress.
+     * @param   tokenAddress        The hex encoded contract Ethereum address where the ERC20 token is deployed.
+     * @param   fromAddress         The hex encoded user Ethereum address that will send the funds.
+     * @param   toAddress           The hex encoded user Ethereum address that will receive the funds.
+     * @param   senderAddress       The hex encoded user Ethereum address whose funds are being sent. The senderAddress
+     *                              must have set an allowance to the fromAddress before this call.
+     * @param   amountInBaseUnits   The amount (specified in baseUnits) of the token to transfer.
      */
     public async transferFromAsync(tokenAddress: string, fromAddress: string, toAddress: string,
                                    senderAddress: string, amountInBaseUnits: BigNumber.BigNumber):