foo.pot

diff --git a/static/jsx/activity_feed.tsx b/static/jsx/activity_feed.tsx
index 217882f5f..1425da3cd 100644
--- a/static/jsx/activity_feed.tsx
+++ b/static/jsx/activity_feed.tsx
@@ -41,7 +41,9 @@ const rootReducer = combineReducers({
   activitiesState,
   buildingDetailsState,
   paginationState,
-});
+} as any);
+// This `as any`cast is a workaround to a bug in redux's TypeScript typings
+// see https://github.com/reduxjs/redux/issues/2709#issuecomment-357328709
 
 const store = createStore(rootReducer, applyMiddleware(thunk));
 store.dispatch(loadActivity());
diff --git a/static/jsx/broker/activity/actions.ts b/static/jsx/broker/activity/actions.ts
index 6f31f7676..5e6a572ef 100644
--- a/static/jsx/broker/activity/actions.ts
+++ b/static/jsx/broker/activity/actions.ts
@@ -1,5 +1,10 @@
-import Axios from 'axios';
+import Axios, { CancelTokenSource } from 'axios';
 
+import {
+  ActivityFeedState,
+  BuildingDetailsState,
+  PaginationState,
+} from 'jsx/broker/activity/types';
 import {
   addBuildingDetailsToUrl,
   handleActivityFeedNetworkError,
@@ -26,7 +31,6 @@ export const LOAD_ACTIVITIES_SUCCESS = 'LOAD_ACTIVITIES_SUCCESS';
 export const LOAD_ACTIVITIES_FAILURE = 'LOAD_ACTIVITIES_FAILURE';
 
 const activityFeedApiUrl: string = Urls['broker-activity-api']();
-
 const getAdvisorOverrideFromUrl = (): URLSearchParams => {
   // We use URLSearchParams here because they format repeating arguments the way Django likes,
   // object_type=favorite&object_type=signup is used rather than
@@ -83,6 +87,37 @@ export function loadActivity(url: string = activityFeedApiUrl) {
 
 export const FILTER_ACTIVITIES_SUCCESS = 'FILTER_ACTIVITIES_SUCCESS';
 
+interface LoadActivitiesRequestAction {
+  type: typeof LOAD_ACTIVITIES_REQUEST;
+  payload: CancelTokenSource;
+};
+
+interface LoadActivitiesSuccessAction {
+  type: typeof LOAD_ACTIVITIES_SUCCESS;
+  payload: { data: Array<any> };
+};
+
+interface LoadActivitiesFailureAction {
+  type: typeof LOAD_ACTIVITIES_FAILURE;
+  payload: Array<any>;
+};
+
+interface FilterActivitiesSuccessAction {
+  type: typeof FILTER_ACTIVITIES_SUCCESS;
+  payload: { data: Array<any> };
+};
+
+export type ActivitesActionTypes =
+  LoadActivitiesRequestAction |
+  LoadActivitiesSuccessAction |
+  LoadActivitiesFailureAction |
+  FilterActivitiesSuccessAction;
+
+export interface PaginationAction {
+  type: typeof LOAD_ACTIVITIES_SUCCESS | typeof FILTER_ACTIVITIES_SUCCESS;
+  payload: { links: PaginationState }
+};
+
 // Todo: clean this duplication between loadActivity and filterActivity that was introduced
 // to fix a bug. See #4020
 export function filterActivity(selected: Array<string>, url: string = activityFeedApiUrl) {
diff --git a/static/jsx/broker/activity/reducers.ts b/static/jsx/broker/activity/reducers.ts
index 2559ac970..c48a24827 100644
--- a/static/jsx/broker/activity/reducers.ts
+++ b/static/jsx/broker/activity/reducers.ts
@@ -1,20 +1,22 @@
 import * as Actions from 'jsx/broker/activity/actions';
+import {
+  ActivityFeedState,
+  BuildingDetailsState,
+  PaginationState,
+} from 'jsx/broker/activity/types';
 
-export interface DefaultActivityFeedState {
-  activities: Array<any>;
-  axiosSource: any | null;
-  errors: Array<Error>;
-  isLoading: boolean;
-};
 
-const defaultActivityFeedState: DefaultActivityFeedState = {
+const defaultActivityFeedState: ActivityFeedState = {
   activities: [],
   axiosSource: null, // The mechanism Axios (our request library) uses to abort in-flight requests
   errors: [],
   isLoading: false,
 };
 
-export function activitiesState(state: DefaultActivityFeedState = defaultActivityFeedState, action: any) {
+export function activitiesState(
+  state: ActivityFeedState = defaultActivityFeedState,
+  action: Actions.ActivitesActionTypes,
+) {
   switch (action.type) {
     case Actions.LOAD_ACTIVITIES_REQUEST: {
       if (state.axiosSource) {
@@ -58,13 +60,16 @@ export function activitiesState(state: DefaultActivityFeedState = defaultActivit
   }
 }
 
-const defaultPaginationState = {
+const defaultPaginationState: PaginationState = {
   prev: null,
   self: null,
   next: null,
 };
 
-export function paginationState(state = defaultPaginationState, action) {
+export function paginationState(
+  state: PaginationState = defaultPaginationState,
+  action: Actions.PaginationAction,
+) {
   switch (action.type) {
     case Actions.LOAD_ACTIVITIES_SUCCESS:
     case Actions.FILTER_ACTIVITIES_SUCCESS: {
@@ -79,12 +84,12 @@ export function paginationState(state = defaultPaginationState, action) {
   }
 }
 
-const defaultBuildingDetailsState = {
+const defaultBuildingDetailsState: BuildingDetailsState = {
   buildingDetails: null,
   shouldShowBuildingPanel: false,
 };
 
-export function buildingDetailsState(state = defaultBuildingDetailsState, action) {
+export function buildingDetailsState(state: BuildingDetailsState = defaultBuildingDetailsState, action) {
   switch (action.type) {
     case Actions.LOAD_BUILDING_DETAILS_SUCCESS: {
       return {
diff --git a/static/jsx/broker/activity/types.ts b/static/jsx/broker/activity/types.ts
new file mode 100644
index 000000000..973f4a717
--- /dev/null
+++ b/static/jsx/broker/activity/types.ts
@@ -0,0 +1,17 @@
+export interface ActivityFeedState {
+  activities: Array<any>;
+  axiosSource: any | null;
+  errors: Array<Error>;
+  isLoading: boolean;
+};
+
+export interface PaginationState {
+  prev: string | null;
+  self: string | null;
+  next: string | null;
+};
+
+export interface BuildingDetailsState {
+  buildingDetails: any | null;
+  shouldShowBuildingPanel: boolean;
+}