3 files changed, 26 insertions, 22 deletions

diff --git a/packages/instant/src/redux/analytics_middleware.ts b/packages/instant/src/redux/analytics_middleware.ts
index 889cc875e..931902187 100644
--- a/packages/instant/src/redux/analytics_middleware.ts
+++ b/packages/instant/src/redux/analytics_middleware.ts
@@ -27,19 +27,17 @@ export const analyticsMiddleware: Middleware = store => next => middlewareAction
                     prevAccount.state === AccountState.Ready && prevAccount.address !== curAccount.address;
                 const ethAddress = curAccount.address;
                 if (didJustTurnReady) {
-                    analytics.trackAccountReady(ethAddress);
-                    analytics.addUserProperties({ ethAddress });
+                    analytics.trackAccountReady({ address: ethAddress });
+                    analytics.addUserProperties({ lastKnownEthAddress: ethAddress });
                 } else if (didJustUpdateAddress) {
-                    analytics.trackAccountAddressChanged(ethAddress);
-                    analytics.addUserProperties({ ethAddress });
+                    analytics.trackAccountAddressChanged({ address: ethAddress });
+                    analytics.addUserProperties({ lastKnownEthAddress: ethAddress });
                 }
             }
             break;
         case ActionTypes.SET_ACCOUNT_STATE_LOCKED:
             if (prevAccount.state !== AccountState.Locked && curAccount.state === AccountState.Locked) {
-                // if we are moving from account not locked to account locked, update the current address to undefined and track `Account - Locked`
-                const ethAddress = undefined;
-                analytics.addUserProperties({ ethAddress });
+                // if we are moving from account not locked to account locked, track `Account - Locked`
                 analytics.trackAccountLocked();
             }
             break;
diff --git a/packages/instant/src/util/analytics.ts b/packages/instant/src/util/analytics.ts
index d36bf8fc3..31233fe7a 100644
--- a/packages/instant/src/util/analytics.ts
+++ b/packages/instant/src/util/analytics.ts
@@ -1,6 +1,4 @@
-import { ObjectMap } from '@0x/types';
-
-import { heapUtil } from './heap';
+import { EventProperties, heapUtil } from './heap';
 
 let isDisabled = false;
 export const disableAnalytics = (shouldDisableAnalytics: boolean) => {
@@ -21,9 +19,9 @@ enum EventNames {
     ACCOUNT_UNLOCK_DENIED = 'Account - Unlock Denied',
     ACCOUNT_ADDRESS_CHANGED = 'Account - Address Changed',
 }
-const track = (eventName: EventNames, eventData: ObjectMap<string | number> = {}): void => {
+const track = (eventName: EventNames, eventProperties: EventProperties = {}): void => {
     evaluateIfEnabled(() => {
-        heapUtil.evaluateHeapCall(heap => heap.track(eventName, eventData));
+        heapUtil.evaluateHeapCall(heap => heap.track(eventName, eventProperties));
     });
 };
 function trackingEventFnWithoutPayload(eventName: EventNames): () => void {
@@ -32,16 +30,14 @@ function trackingEventFnWithoutPayload(eventName: EventNames): () => void {
     };
 }
 // tslint:disable-next-line:no-unused-variable
-function trackingEventFnWithPayload<T extends ObjectMap<string | number>>(
-    eventName: EventNames,
-): (eventDataProperties: T) => void {
-    return (eventDataProperties: T) => {
-        track(eventName, eventDataProperties);
+function trackingEventFnWithPayload(eventName: EventNames): (eventProperties: EventProperties) => void {
+    return (eventProperties: EventProperties) => {
+        track(eventName, eventProperties);
     };
 }
 
 export interface AnalyticsUserOptions {
-    ethAddress?: string;
+    lastKnownEthAddress?: string;
     ethBalanceInUnitAmount?: string;
 }
 export interface AnalyticsEventOptions {
@@ -52,6 +48,13 @@ export interface AnalyticsEventOptions {
     gitSha?: string;
     npmVersion?: string;
 }
+export interface AccountReadyEventProperties {
+    address: string;
+}
+export interface AccountAddressChangedEventProperties {
+    address: string;
+}
+
 export const analytics = {
     addUserProperties: (properties: AnalyticsUserOptions): void => {
         evaluateIfEnabled(() => {
@@ -65,9 +68,10 @@ export const analytics = {
     },
     trackInstantOpened: trackingEventFnWithoutPayload(EventNames.INSTANT_OPENED),
     trackAccountLocked: trackingEventFnWithoutPayload(EventNames.ACCOUNT_LOCKED),
-    trackAccountReady: (address: string) => trackingEventFnWithPayload(EventNames.ACCOUNT_READY)({ address }),
+    trackAccountReady: (eventProperties: AccountReadyEventProperties) =>
+        trackingEventFnWithPayload(EventNames.ACCOUNT_READY)({ ...eventProperties }),
     trackAccountUnlockRequested: trackingEventFnWithoutPayload(EventNames.ACCOUNT_UNLOCK_REQUESTED),
     trackAccountUnlockDenied: trackingEventFnWithoutPayload(EventNames.ACCOUNT_UNLOCK_DENIED),
-    trackAccountAddressChanged: (address: string) =>
-        trackingEventFnWithPayload(EventNames.ACCOUNT_ADDRESS_CHANGED)({ address }),
+    trackAccountAddressChanged: (eventProperties: AccountAddressChangedEventProperties) =>
+        trackingEventFnWithPayload(EventNames.ACCOUNT_ADDRESS_CHANGED)({ ...eventProperties }),
 };
diff --git a/packages/instant/src/util/heap.ts b/packages/instant/src/util/heap.ts
index 78ec3b3cc..7c53c9918 100644
--- a/packages/instant/src/util/heap.ts
+++ b/packages/instant/src/util/heap.ts
@@ -6,11 +6,13 @@ import { HEAP_ANALYTICS_ID } from '../constants';
 
 import { AnalyticsEventOptions, AnalyticsUserOptions } from './analytics';
 
+export type EventProperties = ObjectMap<string | number>;
+
 export interface HeapAnalytics {
     loaded: boolean;
     appid: string;
     identify(id: string, idType: string): void;
-    track(eventName: string, eventProperties?: ObjectMap<string | number>): void;
+    track(eventName: string, eventProperties?: EventProperties): void;
     resetIdentity(): void;
     addUserProperties(properties: AnalyticsUserOptions): void;
     addEventProperties(properties: AnalyticsEventOptions): void;