Overwrite "App" component in Next.js

_app.js

import React from 'react'
import { Provider } from 'react-redux'
import withRedux from 'next-redux-wrapper'
import { initStore } from '../store/store'
import App from 'next/app';

const MyApp = props => {
  const { Component, pageProps, store } = props
  return (
    <Provider store={store}>
      <Component {...pageProps} />
    </Provider>
  )
}

MyApp.getInitialProps = async (appContext) => {
  // calls page's `getInitialProps` and fills `appProps.pageProps`
  const appProps = await App.getInitialProps(appContext);

  return { ...appProps }
}

export default withRedux(initStore)(MyApp)