diff --git a/static/js/directives/ui/expiration-status-view/expiration-status-view.component.ts b/static/js/directives/ui/expiration-status-view/expiration-status-view.component.ts
index e3a5bd4a6..21092b951 100644
--- a/static/js/directives/ui/expiration-status-view/expiration-status-view.component.ts
+++ b/static/js/directives/ui/expiration-status-view/expiration-status-view.component.ts
@@ -2,6 +2,11 @@ import { Input, Component, Inject } from 'ng-metadata/core';
 import * as moment from "moment";
 import './expiration-status-view.component.css';
 
+type expirationInfo = {
+  className: string;
+  icon: string;
+};
+
 /**
  * A component that displays expiration status.
  */
@@ -12,12 +17,12 @@ import './expiration-status-view.component.css';
 export class ExpirationStatusViewComponent {
   @Input('<') public expirationDate: Date;
 
-  private getExpirationInfo(expirationDate): any {
+  private getExpirationInfo(expirationDate): expirationInfo|null {
     if (!expirationDate) {
-      return '';
+      return null;
     }
 
-    var expiration = moment(expirationDate);
+    const expiration = moment(expirationDate);
     if (moment().isAfter(expiration)) {
       return {'className': 'expired', 'icon': 'fa-warning'};
     }
@@ -32,4 +37,4 @@ export class ExpirationStatusViewComponent {
 
     return {'className': 'info', 'icon': 'fa-clock-o'};
   }
-}
\ No newline at end of file
+}