React boilerplate in subfolder

diff

 internals/webpack/webpack.base.babel.js 
-    publicPath: '/',
+    publicPath: '/subfolder/',
 
 File internals/webpack/webpack.prod.babel.js 

-    publicPath: '/',
+    publicPath: '/subfolder/',
 
app/app.js

-import { applyRouterMiddleware, Router, browserHistory } from 'react-router';
+import { applyRouterMiddleware, Router, useRouterHistory } from 'react-router';
+import createBrowserHistory from 'history/lib/createBrowserHistory';

 // this uses the singleton browserHistory provided by react-router
 // Optionally, this could be changed to leverage a created history
 // e.g. `const browserHistory = useRouterHistory(createBrowserHistory)();`
+const browserHistory = useRouterHistory(createBrowserHistory)({ basename: '/subfolder' });
 const initialState = {};

app/manifest.json

-  "start_url": "index.html",
+  "start_url": "/subfolder/index.html",

Thanks! I've been looking for this solution, but couldn't get a straight answer. 👍

how the "applyRouterMiddleware" work ??
what is the funtion！！！！