8 files changed, 76 insertions, 120 deletions
diff --git a/packages/0x.js/contract_templates/contract.handlebars b/packages/0x.js/contract_templates/contract.handlebars
index d3fe1b8cc..227cfcc5a 100644
--- a/packages/0x.js/contract_templates/contract.handlebars
+++ b/packages/0x.js/contract_templates/contract.handlebars
@@ -1,6 +1,6 @@
 /**
  * This file is auto-generated using abi-gen. Don't edit directly.
- * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/abi-gen-templates.
+ * Templates can be found at https://github.com/0xProject/0x.js/tree/development/packages/0x.js/contract_templates.
  */
 // tslint:disable-next-line:no-unused-variable
 import { TxData, TxDataPayable } from '@0xproject/types';
@@ -9,6 +9,24 @@ import * as Web3 from 'web3';
 
 import {BaseContract} from './base_contract';
 
+{{#if events}}
+export type {{contractName}}ContractEventArgs =
+{{#each events}}
+    | {{name}}ContractEventArgs{{#if @last}};{{/if}}
+{{/each}}
+
+export enum {{contractName}}Events {
+    {{#each events}}
+    {{name}} = '{{name}}',
+    {{/each}}
+}
+
+{{#each events}}
+{{> event}}
+
+{{/each}}
+{{/if}}
+
 export class {{contractName}}Contract extends BaseContract {
 {{#each methods}}
     {{#this.constant}}
diff --git a/packages/0x.js/contract_templates/partials/event.handlebars b/packages/0x.js/contract_templates/partials/event.handlebars
new file mode 100644
index 000000000..8f8676a4f
--- /dev/null
+++ b/packages/0x.js/contract_templates/partials/event.handlebars
@@ -0,0 +1,5 @@
+export interface {{name}}ContractEventArgs {
+    {{#each inputs}}
+    {{name}}: {{#returnType type}}{{/returnType}},
+    {{/each}}
+};
diff --git a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
index 32c9ae6a9..db7cdee43 100644
--- a/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/ether_token_wrapper.ts
@@ -5,19 +5,11 @@ import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
-import {
-    BlockRange,
-    EtherTokenContractEventArgs,
-    EtherTokenEvents,
-    EventCallback,
-    IndexedFilterValues,
-    TransactionOpts,
-    ZeroExError,
-} from '../types';
+import { BlockRange, EventCallback, IndexedFilterValues, TransactionOpts, ZeroExError } from '../types';
 import { assert } from '../utils/assert';
 
 import { ContractWrapper } from './contract_wrapper';
-import { EtherTokenContract } from './generated/ether_token';
+import { EtherTokenContract, EtherTokenContractEventArgs, EtherTokenEvents } from './generated/ether_token';
 import { TokenWrapper } from './token_wrapper';
 
 /**
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index e0c85505c..c82b7ecf5 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -12,10 +12,7 @@ import {
     EventCallback,
     ExchangeContractErrCodes,
     ExchangeContractErrs,
-    ExchangeContractEventArgs,
-    ExchangeEvents,
     IndexedFilterValues,
-    LogErrorContractEventArgs,
     MethodOpts,
     Order,
     OrderAddresses,
@@ -33,7 +30,12 @@ import { OrderValidationUtils } from '../utils/order_validation_utils';
 import { utils } from '../utils/utils';
 
 import { ContractWrapper } from './contract_wrapper';
-import { ExchangeContract } from './generated/exchange';
+import {
+    ExchangeContract,
+    ExchangeContractEventArgs,
+    ExchangeEvents,
+    LogErrorContractEventArgs,
+} from './generated/exchange';
 import { TokenWrapper } from './token_wrapper';
 
 const SHOULD_VALIDATE_BY_DEFAULT = true;
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index 98c24d059..a018006b8 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -5,21 +5,12 @@ import { Web3Wrapper } from '@0xproject/web3-wrapper';
 import * as _ from 'lodash';
 
 import { artifacts } from '../artifacts';
-import {
-    BlockRange,
-    EventCallback,
-    IndexedFilterValues,
-    MethodOpts,
-    TokenContractEventArgs,
-    TokenEvents,
-    TransactionOpts,
-    ZeroExError,
-} from '../types';
+import { BlockRange, EventCallback, IndexedFilterValues, MethodOpts, TransactionOpts, ZeroExError } from '../types';
 import { assert } from '../utils/assert';
 import { constants } from '../utils/constants';
 
 import { ContractWrapper } from './contract_wrapper';
-import { TokenContract } from './generated/token';
+import { TokenContract, TokenContractEventArgs, TokenEvents } from './generated/token';
 import { TokenTransferProxyWrapper } from './token_transfer_proxy_wrapper';
 
 /**
diff --git a/packages/0x.js/src/index.ts b/packages/0x.js/src/index.ts
index c3c8854da..161945443 100644
--- a/packages/0x.js/src/index.ts
+++ b/packages/0x.js/src/index.ts
@@ -9,26 +9,13 @@ export {
     ExchangeContractErrs,
     ContractEvent,
     Token,
-    ExchangeEvents,
-    TokenEvents,
     IndexedFilterValues,
     BlockRange,
     OrderCancellationRequest,
     OrderFillRequest,
-    LogErrorContractEventArgs,
-    LogCancelContractEventArgs,
-    LogFillContractEventArgs,
-    ExchangeContractEventArgs,
-    TransferContractEventArgs,
-    ApprovalContractEventArgs,
-    TokenContractEventArgs,
-    EtherTokenContractEventArgs,
-    WithdrawalContractEventArgs,
-    DepositContractEventArgs,
     ContractEventArgs,
     Web3Provider,
     ZeroExConfig,
-    EtherTokenEvents,
     MethodOpts,
     OrderTransactionOpts,
     TransactionOpts,
@@ -50,4 +37,26 @@ export {
     TransactionReceiptWithDecodedLogs,
 } from '@0xproject/types';
 
+export {
+    EtherTokenContractEventArgs,
+    WithdrawalContractEventArgs,
+    DepositContractEventArgs,
+    EtherTokenEvents,
+} from './contract_wrappers/generated/ether_token';
+
+export {
+    TransferContractEventArgs,
+    ApprovalContractEventArgs,
+    TokenContractEventArgs,
+    TokenEvents,
+} from './contract_wrappers/generated/token';
+
+export {
+    LogErrorContractEventArgs,
+    LogCancelContractEventArgs,
+    LogFillContractEventArgs,
+    ExchangeContractEventArgs,
+    ExchangeEvents,
+} from './contract_wrappers/generated/exchange';
+
 export { TransactionReceipt } from '@0xproject/types';
diff --git a/packages/0x.js/src/order_watcher/order_state_watcher.ts b/packages/0x.js/src/order_watcher/order_state_watcher.ts
index a9b3eba68..9ff07b38d 100644
--- a/packages/0x.js/src/order_watcher/order_state_watcher.ts
+++ b/packages/0x.js/src/order_watcher/order_state_watcher.ts
@@ -6,26 +6,33 @@ import * as _ from 'lodash';
 
 import { ZeroEx } from '../0x';
 import { ExchangeWrapper } from '../contract_wrappers/exchange_wrapper';
+import {
+    DepositContractEventArgs,
+    EtherTokenEvents,
+    WithdrawalContractEventArgs,
+} from '../contract_wrappers/generated/ether_token';
+import {
+    ExchangeEvents,
+    LogCancelContractEventArgs,
+    LogFillContractEventArgs,
+} from '../contract_wrappers/generated/exchange';
+import {
+    ApprovalContractEventArgs,
+    TokenEvents,
+    TransferContractEventArgs,
+} from '../contract_wrappers/generated/token';
 import { TokenWrapper } from '../contract_wrappers/token_wrapper';
 import { BalanceAndProxyAllowanceLazyStore } from '../stores/balance_proxy_allowance_lazy_store';
 import { OrderFilledCancelledLazyStore } from '../stores/order_filled_cancelled_lazy_store';
 import {
-    ApprovalContractEventArgs,
+    BlockParamLiteral,
     ContractEventArgs,
-    DepositContractEventArgs,
-    EtherTokenEvents,
     ExchangeContractErrs,
-    ExchangeEvents,
-    LogCancelContractEventArgs,
     LogEvent,
-    LogFillContractEventArgs,
     OnOrderStateChangeCallback,
     OrderState,
     OrderStateWatcherConfig,
     SignedOrder,
-    TokenEvents,
-    TransferContractEventArgs,
-    WithdrawalContractEventArgs,
     ZeroExError,
 } from '../types';
 import { assert } from '../utils/assert';
diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index a2d1b9eb4..ab97f7775 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -4,6 +4,10 @@ import { BlockParam, BlockParamLiteral, ContractEventArg, LogWithDecodedArgs } f
 
 import * as Web3 from 'web3';
 
+import { EtherTokenContractEventArgs, EtherTokenEvents } from './contract_wrappers/generated/ether_token';
+import { ExchangeContractEventArgs, ExchangeEvents } from './contract_wrappers/generated/exchange';
+import { TokenContractEventArgs, TokenEvents } from './contract_wrappers/generated/token';
+
 export enum ZeroExError {
     ExchangeContractDoesNotExist = 'EXCHANGE_CONTRACT_DOES_NOT_EXIST',
     ZRXContractDoesNotExist = 'ZRX_CONTRACT_DOES_NOT_EXIST',
@@ -101,60 +105,6 @@ export interface ContractEvent {
     args: ContractEventArgs;
 }
 
-export interface LogFillContractEventArgs {
-    maker: string;
-    taker: string;
-    feeRecipient: string;
-    makerToken: string;
-    takerToken: string;
-    filledMakerTokenAmount: BigNumber;
-    filledTakerTokenAmount: BigNumber;
-    paidMakerFee: BigNumber;
-    paidTakerFee: BigNumber;
-    tokens: string;
-    orderHash: string;
-}
-export interface LogCancelContractEventArgs {
-    maker: string;
-    feeRecipient: string;
-    makerToken: string;
-    takerToken: string;
-    cancelledMakerTokenAmount: BigNumber;
-    cancelledTakerTokenAmount: BigNumber;
-    tokens: string;
-    orderHash: string;
-}
-export interface LogErrorContractEventArgs {
-    errorId: BigNumber;
-    orderHash: string;
-}
-export type ExchangeContractEventArgs =
-    | LogFillContractEventArgs
-    | LogCancelContractEventArgs
-    | LogErrorContractEventArgs;
-export interface TransferContractEventArgs {
-    _from: string;
-    _to: string;
-    _value: BigNumber;
-}
-export interface ApprovalContractEventArgs {
-    _owner: string;
-    _spender: string;
-    _value: BigNumber;
-}
-export interface DepositContractEventArgs {
-    _owner: string;
-    _value: BigNumber;
-}
-export interface WithdrawalContractEventArgs {
-    _owner: string;
-    _value: BigNumber;
-}
-export type TokenContractEventArgs = TransferContractEventArgs | ApprovalContractEventArgs;
-export type EtherTokenContractEventArgs =
-    | TokenContractEventArgs
-    | DepositContractEventArgs
-    | WithdrawalContractEventArgs;
 export type ContractEventArgs = ExchangeContractEventArgs | TokenContractEventArgs | EtherTokenContractEventArgs;
 
 export interface Order {
@@ -197,24 +147,6 @@ export interface TokenAddressBySymbol {
     [symbol: string]: string;
 }
 
-export enum ExchangeEvents {
-    LogFill = 'LogFill',
-    LogCancel = 'LogCancel',
-    LogError = 'LogError',
-}
-
-export enum TokenEvents {
-    Transfer = 'Transfer',
-    Approval = 'Approval',
-}
-
-export enum EtherTokenEvents {
-    Transfer = 'Transfer',
-    Approval = 'Approval',
-    Deposit = 'Deposit',
-    Withdrawal = 'Withdrawal',
-}
-
 export type ContractEvents = TokenEvents | ExchangeEvents | EtherTokenEvents;
 
 export interface IndexedFilterValues {