To upgrade you can run the following command:

npm install react@latest react-dom@latest
Or using yarn:

yarn add react@latest react-dom@latest
In some cases when proxying requests to the Next.js dev server, you will need to ensure the upgrade request is handled correctly. For example, in nginx you would need to add the following configuration:

location /_next/webpack-hmr {
    proxy_pass http://localhost:3000/_next/webpack-hmr;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
}
From:

import { NextContext } from 'next'
import { NextAppContext, DefaultAppIProps } from 'next/app'
import { NextDocumentContext, DefaultDocumentIProps } from 'next/document'
To upgrade you can run the following command:

npm install react@latest react-dom@latest
To upgrade you can run the following command in the terminal:

npm install next@12
To upgrade run the following command:

npm install next@10
In case you're accessing router.events during rendering, in Next.js 11 router.events is no longer provided during pre-rendering. Ensure you're accessing router.events in useEffect:

useEffect(() => {
  const handleRouteChange = (url, { shallow }) => {
    console.log(
      `App is changing to ${url} ${
        shallow ? 'with' : 'without'
      } shallow routing`
    )
  }

  router.events.on('routeChangeStart', handleRouteChange)

  // If the component is unmounted, unsubscribe
  // from the event with the `off` method:
  return () => {
    router.events.off('routeChangeStart', handleRouteChange)
  }
}, [router])
To load a specific locale use this snippet:

import moment from 'moment'
import 'moment/locale/ja'

moment.locale('ja')
to

import { NextPageContext } from 'next'
import { AppContext, AppInitialProps } from 'next/app'
import { DocumentContext, DocumentInitialProps } from 'next/document'
Dynamic components will not render anything by default while loading. You can still customize this behavior by setting the loading property:

import dynamic from 'next/dynamic'

const DynamicComponentWithCustomLoading = dynamic(
  () => import('../components/hello2'),
  {
    loading: () => <p>Loading</p>,
  }
)
Before

import { withAmp } from 'next/amp'

function Home() {
  return <h1>My AMP Page</h1>
}

export default withAmp(Home)
// or
export default withAmp(Home, { hybrid: true })

Recommend

Nextjs Getting Started Manual Setup

Nextjs Getting Started Automatic Setup

Nextjs Deployment Self-Hosting Node.js Server

Nextjs Authentication Authentication Patterns Authenticating Server-Rendered Pages

Nextjs Authentication Authentication Patterns Authenticating Statically Generated Pages

Nextjs Going to Production Caching

Nextjs Testing Jest and React Testing Library Creating your tests:

Nextjs Testing Jest and React Testing Library Setting up Jest (with Babel)

Nextjs Testing Jest and React Testing Library Setting up Jest (with the Rust Compiler)

Nextjs Testing Jest and React Testing Library Quickstart

Nextjs Testing Playwright Creating your first Playwright end-to-end test

Nextjs Testing Playwright Manual setup

Nextjs Testing Playwright Quickstart

Nextjs Testing Cypress Getting ready for Continuous Integration (CI)

Nextjs Testing Cypress Creating your first Cypress integration test

Nextjs Testing Cypress Manual setup

Nextjs Testing Cypress Quickstart

Nextjs Middleware Execution Order

Nextjs Middleware API

Nextjs Middleware Usage

Matplotlib Overview of axisartist toolkit FloatingAxis

Matplotlib Overview of axisartist toolkit GridHelper

Matplotlib Overview of axisartist toolkit Rotation and Alignment of TickLabels Adjusting pad

Matplotlib Overview of axisartist toolkit Rotation and Alignment of TickLabels

Matplotlib Overview of axisartist toolkit HowTo

Matplotlib Overview of axisartist toolkit Default AxisArtists

Matplotlib Overview of axisartist toolkit axisartist axisartist with ParasiteAxes

Matplotlib Overview of axisartist toolkit axisartist

Matplotlib The mplot3d Toolkit Tri-Surface plots

Matplotlib The mplot3d Toolkit

Matplotlib Overview of mpl_toolkits.axes_grid1 AxesDivider

Matplotlib Overview of mpl_toolkits.axes_grid1 axes_grid1 RGBAxes

Matplotlib Overview of mpl_toolkits.axes_grid1 axes_grid1 InsetLocator

Matplotlib Overview of mpl_toolkits.axes_grid1 axes_grid1 ParasiteAxes Example 2. twin

Matplotlib Overview of mpl_toolkits.axes_grid1 axes_grid1 colorbar whose height (or width) in sync with the master axes scatter_hist.py with AxesDivider

Matplotlib Overview of mpl_toolkits.axes_grid1 axes_grid1 AxesDivider Class

Matplotlib Image tutorial Plotting numpy arrays as images Array Interpolation schemes

Matplotlib Image tutorial Plotting numpy arrays as images Examining a specific data range

Matplotlib Image tutorial Plotting numpy arrays as images Color scale reference

Matplotlib Image tutorial Plotting numpy arrays as images Applying pseudocolor schemes to image plots

Matplotlib Image tutorial Plotting numpy arrays as images

Matplotlib Image tutorial Importing image data into Numpy arrays

Matplotlib Image tutorial Startup commands