@nuxtjs/auth-next/templates/plugin.js

import authMiddleware from '~auth/core/middleware'
import Middleware from './middleware'
import Auth from '~auth/core/auth'
import ExpiredAuthSessionError from '~auth/inc/expired-auth-session-error'

// Active schemes
<%= options.uniqueSchemes.map(path => `import ${'scheme_' + hash(path)} from '${(path || '404').replace(/\\/g,'/')}'`).join('\n') %>

Middleware.auth = authMiddleware

export default function (ctx, inject) {
  // Options
  const options = <%= JSON.stringify(options.options) %>

  // Create a new Auth instance
  const $auth = new Auth(ctx, options)

  // Register strategies
  <%=
  options.strategies.map(strategy => {
    const scheme = 'scheme_' + hash(options.strategyScheme.get(strategy))
    const schemeOptions = JSON.stringify(strategy)
    const name = strategy.name
    return `// ${name}\n  $auth.registerStrategy('${name}', new ${scheme}($auth, ${schemeOptions}))`
  }).join('\n\n  ')
  %>

  // Inject it to nuxt context as $auth
  inject('auth', $auth)
  ctx.$auth = $auth

  // Initialize auth
  return $auth.init().catch(error => {
    if (process.client) {

      // Don't console log expired auth session errors. This error is common, and expected to happen.
      // The error happens whenever the user does an ssr request (reload/initial navigation) with an expired refresh
      // token. We don't want to log this as an error.
      if (error instanceof ExpiredAuthSessionError) {
        return
      }

      console.error('[ERROR] [AUTH]', error)
    }
  })
}