Created InitialStateProps Interface and exported

Author: yuanjackie1

src/app/components/App.tsx

@@ -3,20 +3,13 @@ import { MemoryRouter as Router } from 'react-router-dom';
 import MainContainer from '../containers/MainContainer';
 import { StoreContext } from '../store';
 import mainReducer from '../reducers/mainReducer.js';
-
+import { InitialStateProps } from '../components/FrontendTypes';
 // currentTab is the current active tab within Google Chrome.
 // This is used to decide what tab Reactime should be monitoring. This can be "locked"
 // currentTabInApp is the current active tab within Reactime (Map, Performance, History, etc).
 // This is used to determine the proper tutorial to render when How To button is pressed.
 
-const initialState: {
-  port: null | number;
-  currentTab: null | number;
-  currentTitle: null | string;
-  split: null | boolean;
-  tabs: unknown;
-  currentTabInApp: null | string;
-} = {
+const initialState: InitialStateProps = {
   port: null,
   currentTab: null,
   currentTitle: 'No Target',