feat(instant): Heap middleware and first tracking events

packages/instant/src/redux/analytics_middleware.ts

@@ -0,0 +1,38 @@
+import { ObjectMap } from '@0x/types';
+import * as _ from 'lodash';
+import { Middleware } from 'redux';
+
+import { analytics } from '../util/analytics';
+
+import { AccountState } from './../types';
+import { Action, ActionTypes } from './actions';
+import { State } from './reducer';
+
+export const analyticsMiddleware: Middleware = store => next => middlewareAction => {
+    const prevState = store.getState() as State;
+    const nextAction = next(middlewareAction) as Action;
+    const nextState = store.getState() as State;
+
+    const curAccount = nextState.providerState.account;
+    const prevAccount = prevState.providerState.account;
+    switch (nextAction.type) {
+        case ActionTypes.SET_ACCOUNT_STATE_READY:
+            if (curAccount.state === AccountState.Ready && !_.isEqual(curAccount, prevAccount)) {
+                const ethAddress = curAccount.address;
+                analytics.addUserProperties({ ethAddress });
+                analytics.track('Wallet - Ready');
+            }
+            break;
+        case ActionTypes.UPDATE_ACCOUNT_ETH_BALANCE:
+            if (
+                curAccount.state === AccountState.Ready &&
+                curAccount.ethBalanceInWei &&
+                !_.isEqual(curAccount, prevAccount)
+            ) {
+                const ethBalanceInWei = curAccount.ethBalanceInWei.toString();
+                analytics.addUserProperties({ ethBalanceInWei });
+            }
+    }
+
+    return nextAction;
+};