Line 20:21: 'store' is not defined no-undef redux

import { createStore } from "redux";
const store = createStore(reducer);
 ReactDOM.render(
   <Provider store={store}>
     <MuiThemeProvider theme={theme}>
       <App />
     </MuiThemeProvider>
   </Provider>,
   document.getElementById('root')
 );
//here reducer is reducer function