2 files changed, 11 insertions, 8 deletions

diff --git a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
index 7997b1647..c1c95c6db 100644
--- a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
@@ -95,13 +95,13 @@ export class ContractWrapper {
             await this._web3Wrapper.getContractInstanceFromArtifactAsync<ContractType>(artifact, addressIfExists);
         return contractInstance;
     }
-    private _onLogStateChanged<ArgsType extends ContractEventArgs>(removed: boolean, log: Web3.LogEntry): void {
+    private _onLogStateChanged<ArgsType extends ContractEventArgs>(isRemoved: boolean, log: Web3.LogEntry): void {
         _.forEach(this._filters, (filter: Web3.FilterObject, filterToken: string) => {
             if (filterUtils.matchesFilter(log, filter)) {
                 const decodedLog = this._tryToDecodeLogOrNoop(log) as LogWithDecodedArgs<ArgsType>;
                 const logEvent = {
-                    ...decodedLog,
-                    removed,
+                    log: decodedLog,
+                    isRemoved,
                 };
                 this._filterCallbacks[filterToken](null, logEvent);
             }
@@ -117,13 +117,13 @@ export class ContractWrapper {
         this._blockAndLogStreamInterval = intervalUtils.setAsyncExcludingInterval(
             this._reconcileBlockAsync.bind(this), constants.DEFAULT_BLOCK_POLLING_INTERVAL,
         );
-        let removed = false;
+        let isRemoved = false;
         this._onLogAddedSubscriptionToken = this._blockAndLogStreamer.subscribeToOnLogAdded(
-            this._onLogStateChanged.bind(this, removed),
+            this._onLogStateChanged.bind(this, isRemoved),
         );
-        removed = true;
+        isRemoved = true;
         this._onLogRemovedSubscriptionToken = this._blockAndLogStreamer.subscribeToOnLogRemoved(
-            this._onLogStateChanged.bind(this, removed),
+            this._onLogStateChanged.bind(this, isRemoved),
         );
     }
     private _stopBlockAndLogStream(): void {
diff --git a/packages/0x.js/src/types.ts b/packages/0x.js/src/types.ts
index c3aabfd86..ac4106d0b 100644
--- a/packages/0x.js/src/types.ts
+++ b/packages/0x.js/src/types.ts
@@ -40,7 +40,10 @@ export type OrderValues = [BigNumber, BigNumber, BigNumber,
                            BigNumber, BigNumber, BigNumber];
 
 export type LogEvent = Web3.LogEntryEvent;
-export type DecodedLogEvent<ArgsType> = Web3.DecodedLogEntryEvent<ArgsType>;
+export interface DecodedLogEvent<ArgsType> {
+    isRemoved: boolean;
+    log: LogWithDecodedArgs<ArgsType>;
+}
 
 export type EventCallback<ArgsType> = (err: null|Error, log?: DecodedLogEvent<ArgsType>) => void;
 export type EventWatcherCallback = (log: LogEvent) => void;