festa/pages/_app.tsx

import '../styles/globals.css'
import type { AppProps } from 'next/app'
import { LoginContext } from '../components/contexts/login'
import { useState } from 'react'
import { PostcardRenderer } from '../components/postcard/PostcardRenderer'
import { PostcardContext } from '../components/postcard/PostcardContext'
import { appWithTranslation, useTranslation } from 'next-i18next'
import { FestaLoginData } from '../types/user'
import { useStoredLogin } from "../hooks/useStoredLogin"
import { SWRConfig } from 'swr'
import { AxiosRequestConfig } from 'axios'
import { useAxios } from '../hooks/useAxios'
import { ErrorBoundary } from '../components/errors/ErrorBoundary'
import defaultPostcard from "../public/postcards/adi-goldstein-Hli3R6LKibo-unsplash.jpg"
import { useStatePostcard } from '../components/postcard/useStatePostcard'


const App = ({ Component, pageProps }: AppProps): JSX.Element => {
    const { t } = useTranslation()
    const postcardState = useStatePostcard()
    const [login, setLogin] = useState<FestaLoginData | null>(null)
    useStoredLogin(setLogin)

    const axios = useAxios({}, login)

    const swrConfig = {
        fetcher: async (resource: string, init: AxiosRequestConfig<any>) => {
            const response = await axios.get(resource, init)
            // To test loading uncomment the following line:
            // await new Promise(res => setTimeout(res, 100000))
            return response.data
        }
    }

    return <>
        <ErrorBoundary text={t("genericError")}>
            <PostcardContext.Provider value={postcardState}>
                <LoginContext.Provider value={[login, setLogin]}>
                    <SWRConfig value={swrConfig}>
                        <PostcardRenderer />
                        <Component {...pageProps} />
                    </SWRConfig>
                </LoginContext.Provider>
            </PostcardContext.Provider>
        </ErrorBoundary>
    </>
}

export default appWithTranslation(App)