Test fix

Author: schmidt-sebastian

integration/firestore/gulpfile.js

@@ -75,10 +75,10 @@ function copyTests() {
          const firebaseExport = firebase.firestore;
          
          // Abuse 'window' object to share a global variable between all tests
-         window.appCount = window.appCount ? window.appCount : 0;
+         (window as any).appCount =  (window as any).appCount || 0;
          firebaseExport.newTestFirestore = function(projectId, nameOrApp, settings) {
            if (nameOrApp === undefined) {
-             nameOrApp = 'test-app-' + window.appCount++;
+             nameOrApp = 'test-app-' + (window as any).appCount++;
            }
            const app =
              typeof nameOrApp === 'string'