rsnext/examples/with-mobx-react-lite/pages/_app.js

import App from 'next/app'
import React from 'react'
import { InjectStoreContext, initializeData } from '../store'

class MyMobxApp extends App {
  static async getInitialProps({ Component, ctx }) {
    let pageProps = {}
    const initialStoreData = initializeData()

    // Provide the store to getInitialProps of pages
    if (Component.getInitialProps) {
      pageProps = await Component.getInitialProps({ ...ctx, initialStoreData })
    }

    return {
      pageProps,
      initialStoreData,
    }
  }

  render() {
    const { Component, pageProps, initialStoreData } = this.props
    return (
      <InjectStoreContext initialData={initialStoreData}>
        <Component {...pageProps} />
      </InjectStoreContext>
    )
  }
}
export default MyMobxApp