HomeContent.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 */

import {
  Suspense,
  createContext,
  memo,
  useContext,
  useEffect,
  useId,
  useRef,
  useState,
  useTransition,
} from 'react';

import BlogCard from 'components/MDX/BlogCard';
import ButtonLink from '../ButtonLink';
import CodeBlock from 'components/MDX/CodeBlock';
import {ExternalLink} from 'components/ExternalLink';
import {IconChevron} from 'components/Icon/IconChevron';
import {IconRestart} from '../Icon/IconRestart';
import {IconSearch} from 'components/Icon/IconSearch';
import Link from 'components/MDX/Link';
import {Logo} from 'components/Logo';
import NextLink from 'next/link';
import cn from 'classnames';
import sidebarBlog from '../../sidebarBlog.json';
import * as React from 'react';
import Image from 'next/image';

function Section({children, background = null}) {
  return (
    <div
      className={cn(
        'mx-auto flex flex-col w-full',
        background === null && 'max-w-7xl',
        background === 'left-card' &&
          'bg-gradient-left dark:bg-gradient-left-dark border-t border-primary/10 dark:border-primary-dark/10 ',
        background === 'right-card' &&
          'bg-gradient-right dark:bg-gradient-right-dark border-t border-primary/5 dark:border-primary-dark/5'
      )}
      style={{
        contain: 'content',
      }}>
      <div className="flex-col gap-2 flex grow w-full my-20 lg:my-32 mx-auto items-center">
        {children}
      </div>
    </div>
  );
}

function Header({children}) {
  return (
    <h2 className="leading-xl font-display text-primary dark:text-primary-dark font-semibold text-5xl lg:text-6xl -mt-4 mb-7 w-full max-w-3xl lg:max-w-xl">
      {children}
    </h2>
  );
}

function Para({children}) {
  return (
    <p className="max-w-3xl mx-auto text-lg lg:text-xl text-secondary dark:text-secondary-dark leading-normal">
      {children}
    </p>
  );
}

function Center({children}) {
  return (
    <div className="px-5 lg:px-0 max-w-4xl lg:text-center text-white text-opacity-80 flex flex-col items-center justify-center">
      {children}
    </div>
  );
}

function FullBleed({children}) {
  return (
    <div className="max-w-7xl mx-auto flex flex-col w-full">{children}</div>
  );
}

function CurrentTime() {
  const [date, setDate] = useState(new Date());
  const currentTime = date.toLocaleTimeString([], {
    hour: 'numeric',
    minute: 'numeric',
  });
  useEffect(() => {
    const msPerMinute = 60 * 1000;
    let nextMinute = Math.floor(+date / msPerMinute + 1) * msPerMinute;

    const timeout = setTimeout(() => {
      if (Date.now() > nextMinute) {
        setDate(new Date());
      }
    }, nextMinute - Date.now());
    return () => clearTimeout(timeout);
  }, [date]);

  return <span suppressHydrationWarning>{currentTime}</span>;
}

const blogSidebar = sidebarBlog.routes[1];
if (blogSidebar.path !== '/blog') {
  throw Error('Could not find the blog route in sidebarBlog.json');
}
const recentPosts = blogSidebar.routes.slice(0, 4).map((entry) => ({
  title: entry.titleForHomepage,
  icon: entry.icon,
  date: entry.date,
  url: entry.path,
}));

export function HomeContent() {
  return (
    <>
      <div className="ps-0">
        <div className="mx-5 mt-12 lg:mt-24 mb-20 lg:mb-32 flex flex-col justify-center">
          <div className="uwu-visible flex justify-center">
            <Image
              alt="logo by @sawaratsuki1004"
              title="logo by @sawaratsuki1004"
              loading="eager"
              width={313}
              height={160}
              src="/images/uwu.png"
            />
          </div>
          <Logo
            className={cn(
              'uwu-hidden mt-4 mb-3 text-brand dark:text-brand-dark w-24 lg:w-28 self-center text-sm me-0 flex origin-center transition-all ease-in-out'
            )}
          />
          <h1 className="uwu-hidden text-5xl font-display lg:text-6xl self-center flex font-semibold leading-snug text-primary dark:text-primary-dark">
            React
          </h1>
          <p className="text-4xl font-display max-w-lg md:max-w-full py-1 text-center text-secondary dark:text-primary-dark leading-snug self-center">
            La libreria per le interfacce utente web e native
          </p>
          <div className="mt-5 self-center flex gap-2 w-full sm:w-auto flex-col sm:flex-row">
            <ButtonLink
              href={'/learn'}
              type="primary"
              size="lg"
              className="w-full sm:w-auto justify-center"
              label="Impara React">
              Impara React
            </ButtonLink>
            <ButtonLink
              href={'/reference/react'}
              type="secondary"
              size="lg"
              className="w-full sm:w-auto justify-center"
              label="API di Riferimento">
              API di Riferimento
            </ButtonLink>
          </div>
        </div>

        <Section background="left-card">
          <Center>
            <Header>Crea interfacce utente dai componenti</Header>
            <Para>
              React ti permette di creare interfacce utente a partire da
              componenti individuali. Crea i tuoi componenti React come{' '}
              <Code>Thumbnail</Code>, <Code>LikeButton</Code>, e{' '}
              <Code>Video</Code>. Poi combinali per creare interfacce, pagine ed
              app.
            </Para>
          </Center>
          <FullBleed>
            <Example1 />
          </FullBleed>
          <Center>
            <Para>
              Sia che lavoriate in solitaria o con migliaia di altri
              sviluppatori, utilizzare React è sempre lo stesso. È stato
              progettato per permettervi di combinare facilmente componenti
              scritti da persone, team e organizzazioni indipendenti.
            </Para>
          </Center>
        </Section>

        <Section background="right-card">
          <Center>
            <Header>Scrivi componenti con logica e markup</Header>
            <Para>
              I componenti React sono funzioni JavaScript. Vuoi mostrare del
              contenuto in modo condizionale? Usa un <Code>if</Code>. Vuoi
              mostrare una lista? Prova <Code>map()</Code>. Imparare React è
              imparare a programmare.
            </Para>
          </Center>
          <FullBleed>
            <Example2 />
          </FullBleed>
          <Center>
            <Para>
              Questa sintassi di markup è chiamata JSX. È una sintassi
              JavaScript estesa popularizzata da React. Mettere JSX markup
              vicino alla logica di rendering relativa rende i componenti React
              facili da creare, mantenere e cancellare.
            </Para>
          </Center>
        </Section>

        <Section background="left-card">
          <Center>
            <Header>Aggiungi interattività ovunque tu abbia bisogno</Header>
            <Para>
              I componenti React ricevono dati e ritornano quello che dovrebbe
              apparire sullo schermo. Puoi passargli nuovi dati in risposta ad
              una interazione, come quando l&apos;utente digita in un input.
              React aggiornerà lo schermo per corrispondere ai nuovi dati.
            </Para>
          </Center>
          <FullBleed>
            <Example3 />
          </FullBleed>
          <Center>
            <Para>
              Non devi costruire tutta la tua pagina in React. Aggiungi React
              alla tua pagina HTML esistente e renderizza componenti React
              interattivi ovunque.
            </Para>
            <div className="flex justify-start w-full lg:justify-center">
              <CTA
                color="gray"
                icon="code"
                href="/learn/add-react-to-an-existing-project">
                Aggiungi React alla tua pagina
              </CTA>
            </div>
          </Center>
        </Section>

        <Section background="right-card">
          <Center>
            <Header>
              Vai full-stack <br className="hidden lg:inline" />
              con un framework
            </Header>
            <Para>
              React è una libreria. Ti permette di mettere insieme componenti,
              ma non prescrive come fare routing e data fetching. Per costruire
              un&apos;applicazione intera con React, ti consigliamo un framework
              full-stack come <Link href="https://nextjs.org">Next.js</Link> o{' '}
              <Link href="https://reactrouter.com">React Router</Link>.
            </Para>
          </Center>
          <FullBleed>
            <Example4 />
          </FullBleed>
          <Center>
            <Para>
              React è anche un&apos;architettura. I framework che la
              implementano ti permettono di recuperare dati in componenti
              asincroni che funzionano sul server o addirittura durante la
              compilazione. Leggi dati da un file o un database e passali ai
              tuoi componenti interattivi.
            </Para>
            <div className="flex justify-start w-full lg:justify-center">
              <CTA
                color="gray"
                icon="framework"
                href="/learn/creating-a-react-app">
                Inizia con un framework
              </CTA>
            </div>
          </Center>
        </Section>
        <Section background="left-card">
          <div className="mx-auto flex flex-col w-full">
            <div className="mx-auto max-w-4xl lg:text-center items-center px-5 flex flex-col">
              <Header>Usa il meglio di ogni piattaforma</Header>
              <Para>
                Le persone amano le app web e native per motivi diversi. React
                ti permette di creare app web e native utilizzando le stesse
                competenze. Si basa sulle forze uniche di ogni piattaforma per
                far sentire le tue interfacce proprio come dovrebbero su ogni
                piattaforma.
              </Para>
            </div>
            <div className="max-w-7xl mx-auto flex flex-col lg:flex-row mt-16 mb-20 lg:mb-28 px-5 gap-20 lg:gap-5">
              <div className="relative lg:w-6/12 flex">
                <div className="absolute -bottom-8 lg:-bottom-10 z-10 w-full">
                  <WebIcons />
                </div>
                <BrowserChrome hasRefresh={false} domain="example.com">
                  <div className="relative overflow-hidden">
                    <div className="absolute inset-0 bg-gradient-right" />
                    <div className="bg-wash relative h-14 w-full" />
                    <div className="relative flex items-start justify-center flex-col flex-1 pb-16 pt-5 gap-3 px-5 lg:px-10 lg:pt-8">
                      <h4 className="leading-tight text-primary font-semibold text-3xl lg:text-4xl">
                        Adatta la tua app web
                      </h4>
                      <p className="lg:text-xl leading-normal text-secondary">
                        Le persone si aspettano che le pagine delle app web
                        carichino velocemente. Sul server, React ti permette di
                        iniziare a inviare HTML mentre stai ancora recuperando i
                        dati, riempiendo progressivamente il contenuto rimanente
                        prima che venga caricato alcun codice JavaScript. Sul
                        client, React può utilizzare le API standard del web per
                        mantenere la tua interfaccia utente reattiva anche
                        durante il rendering.
                      </p>
                    </div>
                  </div>
                </BrowserChrome>
              </div>
              <div className="relative lg:w-6/12 flex">
                <div className="absolute -bottom-8 lg:-bottom-10 z-10 w-full">
                  <NativeIcons />
                </div>
                <figure className="mx-auto max-w-3xl h-auto">
                  <div className="p-2.5 bg-gray-95 dark:bg-black rounded-2xl shadow-nav dark:shadow-nav-dark">
                    <div className="bg-gradient-right dark:bg-gradient-right-dark px-3 sm:px-3 pb-12 lg:pb-20 rounded-lg overflow-hidden">
                      <div className="select-none w-full h-14 flex flex-row items-start pt-3 -mb-2.5 justify-between text-tertiary dark:text-tertiary-dark">
                        <span className="uppercase tracking-wide leading-none font-bold text-sm text-tertiary dark:text-tertiary-dark">
                          <CurrentTime />
                        </span>
                        <div className="gap-2 flex -mt-0.5">
                          <svg
                            width="16"
                            height="20"
                            viewBox="0 0 72 72"
                            fill="none"
                            xmlns="http://www.w3.org/2000/svg">
                            <path
                              fillRule="evenodd"
                              clipRule="evenodd"
                              d="M34.852 6.22836C35.973 5.76401 37.2634 6.02068 38.1214 6.87868L53.1214 21.8787C53.7485 22.5058 54.066 23.3782 53.9886 24.2617C53.9113 25.1451 53.447 25.9491 52.7205 26.4577L39.0886 36.0003L52.7204 45.5423C53.447 46.0508 53.9113 46.8548 53.9886 47.7383C54.066 48.6218 53.7485 49.4942 53.1214 50.1213L38.1214 65.1213C37.2634 65.9793 35.973 66.236 34.852 65.7716C33.731 65.3073 33.0001 64.2134 33.0001 63V40.2624L22.7205 47.4583C21.3632 48.4085 19.4926 48.0784 18.5424 46.721C17.5922 45.3637 17.9223 43.4931 19.2797 42.543L28.6258 36.0004L19.2797 29.4583C17.9224 28.5082 17.5922 26.6376 18.5424 25.2803C19.4925 23.9229 21.3631 23.5928 22.7204 24.5429L33.0001 31.7384V9C33.0001 7.78661 33.731 6.6927 34.852 6.22836ZM39.0001 43.2622L46.3503 48.4072L39.0001 55.7574V43.2622ZM39.0001 28.7382V16.2426L46.3503 23.5929L39.0001 28.7382Z"
                              fill="currentColor"
                            />
                          </svg>

                          <svg
                            width="16"
                            height="20"
                            viewBox="0 0 72 72"
                            fill="none"
                            xmlns="http://www.w3.org/2000/svg">
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                              d="M9 27C9.82864 27 10.5788 26.664 11.1217 26.1209C11.2116 26.0355 11.3037 25.9526 11.397 25.871C11.625 25.6714 11.9885 25.3677 12.4871 24.9938C13.4847 24.2455 15.0197 23.219 17.0912 22.1833C21.2243 20.1167 27.5179 18 35.9996 18C44.4813 18 50.7748 20.1167 54.9079 22.1833C56.9794 23.219 58.5144 24.2455 59.5121 24.9938C59.6056 25.0639 60.8802 26.1233 60.8802 26.1233C61.423 26.6652 62.1724 27 63 27C64.6569 27 66 25.6569 66 24C66 22.8871 65.3475 22.0506 64.5532 21.3556C64.2188 21.0629 63.7385 20.6635 63.1121 20.1938C61.8597 19.2545 60.0197 18.031 57.5912 16.8167C52.7243 14.3833 45.5179 12 35.9996 12C26.4813 12 19.2748 14.3833 14.4079 16.8167C11.9794 18.031 10.1394 19.2545 8.88706 20.1938C8.26066 20.6635 7.78035 21.0629 7.44593 21.3556C7.2605 21.5178 7.07794 21.6834 6.9016 21.8555C6.33334 22.417 6 23.1999 6 24C6 25.6569 7.34315 27 9 27Z"
                              fill="currentColor"
                            />
                            <path
                              fillRule="evenodd"
                              clipRule="evenodd"
                              d="M26.1116 48.631C24.2868 50.4378 21 49.0661 21 46.5C21 45.6707 21.3365 44.92 21.8804 44.3769C21.9856 44.2702 22.0973 44.1695 22.209 44.0697C22.3915 43.9065 22.6466 43.6885 22.9713 43.4344C23.6195 42.9271 24.5536 42.2694 25.7509 41.6163C28.1445 40.3107 31.6365 39 35.9999 39C40.3634 39 43.8554 40.3107 46.249 41.6163C47.4463 42.2694 48.3804 42.9271 49.0286 43.4344C50.0234 44.213 51 45.134 51 46.5C51 48.1569 49.6569 49.5 48 49.5C47.1724 49.5 46.4231 49.1649 45.8803 48.623C45.7028 48.4617 45.5197 48.3073 45.3307 48.1594C44.9007 47.8229 44.2411 47.3556 43.3759 46.8837C41.6445 45.9393 39.1365 45 35.9999 45C32.8634 45 30.3554 45.9393 28.624 46.8837C27.7588 47.3556 27.0992 47.8229 26.6692 48.1594C26.3479 48.4109 26.155 48.5899 26.1116 48.631Z"
                              fill="currentColor"
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                              d="M36 63C39.3137 63 42 60.3137 42 57C42 53.6863 39.3137 51 36 51C32.6863 51 30 53.6863 30 57C30 60.3137 32.6863 63 36 63Z"
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                              fill="currentColor"
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                            width="20"
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                              fill="currentColor"
                            />
                            <path
                              fillRule="evenodd"
                              clipRule="evenodd"
                              d="M12.7887 15C8.77039 15 5.23956 17.668 4.48986 21.6158C3.74326 25.5473 3 30.7737 3 36C3 41.2263 3.74326 46.4527 4.48986 50.3842C5.23956 54.332 8.77039 57 12.7887 57H53.2113C57.2296 57 60.7604 54.332 61.5101 50.3842C61.8155 48.7765 62.1202 46.9522 62.3738 45H63.7918C64.5731 45 65.3283 44.8443 66 44.5491C67.2821 43.9857 68.2596 42.9142 68.5322 41.448C68.7927 40.0466 69 38.2306 69 36C69 33.7694 68.7927 31.9534 68.5322 30.552C68.2596 29.0858 67.2821 28.0143 66 27.4509C65.3283 27.1557 64.5731 27 63.7918 27H62.3738C62.1202 25.0478 61.8155 23.2235 61.5101 21.6158C60.7604 17.668 57.2296 15 53.2113 15H12.7887ZM53.2113 21H12.7887C11.3764 21 10.5466 21.8816 10.3845 22.7352C9.67563 26.4681 9 31.29 9 36C9 40.71 9.67563 45.5319 10.3845 49.2648C10.5466 50.1184 11.3764 51 12.7887 51H53.2113C54.6236 51 55.4534 50.1184 55.6155 49.2648C56.3244 45.5319 57 40.71 57 36C57 31.29 56.3244 26.4681 55.6155 22.7352C55.4534 21.8816 54.6236 21 53.2113 21Z"
                              fill="currentColor"
                            />
                          </svg>
                        </div>
                      </div>
                      <div className="flex flex-col items-start justify-center pt-0 gap-3 px-2.5 lg:pt-8 lg:px-8">
                        <h4 className="leading-tight text-primary dark:text-primary-dark font-semibold text-3xl lg:text-4xl">
                          Vai veramente nativo
                        </h4>
                        <p className="h-full lg:text-xl text-secondary dark:text-secondary-dark leading-normal">
                          Le persone si aspettano che le app native si
                          comportino come la piattaforma d&apos;origine.{' '}
                          <Link href="https://reactnative.dev">
                            React Native
                          </Link>{' '}
                          e{' '}
                          <Link href="https://github.com/expo/expo">Expo</Link>{' '}
                          ti permettono di creare app in React per Android, iOS
                          e molto altro. Sono native perché le loro UI{' '}
                          <i>sono</i> veramente native. Non è una web view, i
                          tuoi componenti React vengono renderizzati come veri
                          componenti Android e iOS forniti dalla piattaforma.
                        </p>
                      </div>
                    </div>
                  </div>
                </figure>
              </div>
            </div>
            <div className="px-5 lg:px-0 max-w-4xl mx-auto lg:text-center text-secondary dark:text-secondary-dark">
              <Para>
                Con React, puoi essere uno sviluppatore web <i>e</i> nativo. Il
                tuo team può rilasciare su molte piattaforme senza sacrificare
                l&apos;esperienza utente. La tua organizzazione può superare le
                barriere tra le piattaforme, e formare team che possiedono
                intere funzionalità end-to-end.
              </Para>
              <div className="flex justify-start w-full lg:justify-center">
                <CTA color="gray" icon="native" href="https://reactnative.dev/">
                  Crea per piattaforme native
                </CTA>
              </div>
            </div>
          </div>
        </Section>

        <Section background="right-card">
          <div className="max-w-7xl mx-auto flex flex-col lg:flex-row px-5">
            <div className="max-w-3xl lg:max-w-7xl gap-5 flex flex-col lg:flex-row lg:px-5">
              <div className="w-full lg:w-6/12 max-w-3xl flex flex-col items-start justify-start lg:ps-5 lg:pe-10">
                <Header>Aggiorna quando il futuro è pronto</Header>
                <Para>
                  React approccia i cambiamenti con cautela. Ogni commit di
                  React viene testato su superfici critiche per il business con
                  oltre un miliardo di utenti. Più di 100.000 componenti React
                  di Meta aiutano a validare ogni strategia di migrazione.
                </Para>
                <div className="order-last pt-5">
                  <Para>
                    Il team di React è sempre alla ricerca di modi per
                    migliorare React. Alcune ricerche richiedono anni per dare i
                    loro frutti. React ha un alto livello di qualità per
                    prendere in considerazione un&apos;idea di ricerca per la
                    produzione. Solo approcci provati diventano parte di React.
                  </Para>
                  <div className="hidden lg:flex justify-start w-full">
                    <CTA color="gray" icon="news" href="/blog">
                      Leggi le ultime notizie su React
                    </CTA>
                  </div>
                </div>
              </div>
              <div className="w-full lg:w-6/12">
                <p className="uppercase tracking-wide font-bold text-sm text-tertiary dark:text-tertiary-dark flex flex-row gap-2 items-center mt-5 lg:-mt-2 w-full">
                  <IconChevron />
                  Ultime notizie su React
                </p>
                <div className="flex-col sm:flex-row flex-wrap flex gap-5 text-start my-5">
                  <div className="flex-1 min-w-[40%] text-start">
                    <BlogCard {...recentPosts[0]} />
                  </div>
                  <div className="flex-1 min-w-[40%] text-start">
                    <BlogCard {...recentPosts[1]} />
                  </div>
                  <div className="flex-1 min-w-[40%] text-start">
                    <BlogCard {...recentPosts[2]} />
                  </div>
                  <div className="hidden sm:flex-1 sm:inline">
                    <BlogCard {...recentPosts[3]} />
                  </div>
                </div>
                <div className="flex lg:hidden justify-start w-full">
                  <CTA color="gray" icon="news" href="/blog">
                    Leggi altre notizie su React
                  </CTA>
                </div>
              </div>
            </div>
          </div>
        </Section>

        <Section background="left-card">
          <div className="w-full">
            <div className="mx-auto flex flex-col max-w-4xl">
              <Center>
                <Header>
                  Accedi a una comunità
                  <br className="hidden lg:inline" />
                  di milioni
                </Header>
                <Para>
                  Non sei solo. Due milioni di sviluppatori da tutto il mondo
                  visitano la documentazione di React ogni mese. React è
                  qualcosa che le persone ed i team possono trovare accordo.
                </Para>
              </Center>
            </div>
            <CommunityGallery />
            <div className="mx-auto flex flex-col max-w-4xl">
              <Center>
                <Para>
                  Ecco perché React è molto di più di una libreria,
                  un&apos;architettura o un ecosistema. React è una comunità. È
                  un luogo dove puoi chiedere aiuto, trovare opportunità e
                  incontrare nuovi amici. Incontrerai sia sviluppatori che
                  designer, principianti e esperti, ricercatori e artisti,
                  insegnanti e studenti. Le nostre esperienze possono essere
                  molto diverse, ma React ci permette di creare interfacce
                  utente insieme.
                </Para>
              </Center>
            </div>
          </div>

          <div className="mt-20 px-5 lg:px-0 mb-6 max-w-4xl text-center text-opacity-80">
            <div className="uwu-visible flex justify-center">
              <img
                alt="logo by @sawaratsuki1004"
                title="logo by @sawaratsuki1004"
                className="uwu-visible mb-10 lg:mb-8 h-24 lg:h-32"
                src="/images/uwu.png"
              />
            </div>
            <Logo className="uwu-hidden text-brand dark:text-brand-dark w-24 lg:w-28 mb-10 lg:mb-8 mt-12 h-auto mx-auto self-start" />
            <Header>
              Benvenuto nella <br className="hidden lg:inline" />
              comunità React
            </Header>
            <ButtonLink
              href={'/learn'}
              type="primary"
              size="lg"
              label="Inizia il Tutorial">
              Inizia qui
            </ButtonLink>
          </div>
        </Section>
      </div>
    </>
  );
}

function CTA({children, icon, href}) {
  let Tag;
  let extraProps;
  if (href.startsWith('https://')) {
    Tag = ExternalLink;
  } else {
    Tag = NextLink;
    extraProps = {legacyBehavior: false};
  }
  return (
    <Tag
      {...extraProps}
      href={href}
      className="focus:outline-none focus-visible:outline focus-visible:outline-link focus:outline-offset-2 focus-visible:dark:focus:outline-link-dark group cursor-pointer w-auto justify-center inline-flex font-bold items-center mt-10 outline-none hover:bg-gray-40/5 active:bg-gray-40/10 hover:dark:bg-gray-60/5 active:dark:bg-gray-60/10 leading-tight hover:bg-opacity-80 text-lg py-2.5 rounded-full px-4 sm:px-6 ease-in-out shadow-secondary-button-stroke dark:shadow-secondary-button-stroke-dark text-primary dark:text-primary-dark">
      {icon === 'native' && (
        <svg
          className="me-2.5 text-primary dark:text-primary-dark"
          fill="none"
          width="24"
          height="24"
          viewBox="0 0 72 72"
          aria-hidden="true">
          <g clipPath="url(#clip0_8_10998)">
            <path
              d="M54.0001 15H18.0001C16.3432 15 15.0001 16.3431 15.0001 18V42H33V48H12.9567L9.10021 57L24.0006 57C24.0006 55.3431 25.3437 54 27.0006 54H33V57.473C33 59.3786 33.3699 61.2582 34.0652 63H9.10021C4.79287 63 1.88869 58.596 3.5852 54.6368L9.0001 42V18C9.0001 13.0294 13.0295 9 18.0001 9H54.0001C58.9707 9 63.0001 13.0294 63.0001 18V25.4411C62.0602 25.0753 61.0589 24.8052 60.0021 24.6458C59.0567 24.5032 58.0429 24.3681 57.0001 24.2587V18C57.0001 16.3431 55.6569 15 54.0001 15Z"
              fill="currentColor"
            />
            <path
              d="M48 42C48 40.3431 49.3431 39 51 39H54C55.6569 39 57 40.3431 57 42C57 43.6569 55.6569 45 54 45H51C49.3431 45 48 43.6569 48 42Z"
              fill="currentColor"
            />
            <path
              fillRule="evenodd"
              clipRule="evenodd"
              d="M45.8929 30.5787C41.8093 31.1947 39 34.8257 39 38.9556V57.473C39 61.6028 41.8093 65.2339 45.8929 65.8499C48.0416 66.174 50.3981 66.4286 52.5 66.4286C54.6019 66.4286 56.9584 66.174 59.1071 65.8499C63.1907 65.2339 66 61.6028 66 57.473V38.9556C66 34.8258 63.1907 31.1947 59.1071 30.5787C56.9584 30.2545 54.6019 30 52.5 30C50.3981 30 48.0416 30.2545 45.8929 30.5787ZM60 57.473V38.9556C60 37.4615 59.0438 36.637 58.2121 36.5116C56.2014 36.2082 54.1763 36 52.5 36C50.8237 36 48.7986 36.2082 46.7879 36.5116C45.9562 36.637 45 37.4615 45 38.9556V57.473C45 58.9671 45.9562 59.7916 46.7879 59.917C48.7986 60.2203 50.8237 60.4286 52.5 60.4286C54.1763 60.4286 56.2014 60.2203 58.2121 59.917C59.0438 59.7916 60 58.9671 60 57.473Z"
              fill="currentColor"
            />
          </g>
          <defs>
            <clipPath id="clip0_8_10998">
              <rect width="72" height="72" fill="white" />
            </clipPath>
          </defs>
        </svg>
      )}
      {icon === 'framework' && (
        <svg
          className="me-2.5 text-primary dark:text-primary-dark"
          fill="none"
          width="24"
          height="24"
          viewBox="0 0 72 72"
          aria-hidden="true">
          <g clipPath="url(#clip0_10_21081)">
            <path
              fillRule="evenodd"
              clipRule="evenodd"
              d="M44.9136 29.0343C46.8321 26.9072 48 24.09 48 21C48 14.3726 42.6274 9 36 9C29.3726 9 24 14.3726 24 21C24 24.0904 25.1682 26.9079 27.0871 29.0351L21.0026 39.3787C20.0429 39.1315 19.0368 39 18 39C11.3726 39 6 44.3726 6 51C6 57.6274 11.3726 63 18 63C23.5915 63 28.2898 59.1757 29.6219 54H42.3781C43.7102 59.1757 48.4085 63 54 63C60.6274 63 66 57.6274 66 51C66 44.3726 60.6274 39 54 39C52.9614 39 51.9537 39.1319 50.9926 39.38L44.9136 29.0343ZM42 21C42 24.3137 39.3137 27 36 27C32.6863 27 30 24.3137 30 21C30 17.6863 32.6863 15 36 15C39.3137 15 42 17.6863 42 21ZM39.9033 32.3509C38.6796 32.7716 37.3665 33 36 33C34.6338 33 33.321 32.7717 32.0975 32.3512L26.2523 42.288C27.8635 43.8146 29.0514 45.7834 29.6219 48H42.3781C42.9482 45.785 44.1348 43.8175 45.7441 42.2913L39.9033 32.3509ZM54 57C50.6863 57 48 54.3137 48 51C48 47.6863 50.6863 45 54 45C57.3137 45 60 47.6863 60 51C60 54.3137 57.3137 57 54 57ZM24 51C24 47.6863 21.3137 45 18 45C14.6863 45 12 47.6863 12 51C12 54.3137 14.6863 57 18 57C21.3137 57 24 54.3137 24 51Z"
              fill="currentColor"
            />
          </g>
          <defs>
            <clipPath id="clip0_10_21081">
              <rect width="72" height="72" fill="white" />
            </clipPath>
          </defs>
        </svg>
      )}
      {icon === 'code' && (
        <svg
          className="me-2.5 text-primary dark:text-primary-dark"
          fill="none"
          width="24"
          height="24"
          viewBox="0 0 72 72"
          aria-hidden="true">
          <g clipPath="url(#clip0_8_9064)">
            <path
              d="M44.7854 22.1142C45.4008 20.5759 44.6525 18.83 43.1142 18.2146C41.5758 17.5993 39.8299 18.3475 39.2146 19.8859L27.2146 49.8859C26.5992 51.4242 27.3475 53.1702 28.8858 53.7855C30.4242 54.4008 32.1701 53.6526 32.7854 52.1142L44.7854 22.1142Z"
              fill="currentColor"
            />
            <path
              d="M9.87868 38.1214C8.70711 36.9498 8.70711 35.0503 9.87868 33.8787L18.8787 24.8787C20.0503 23.7072 21.9497 23.7072 23.1213 24.8787C24.2929 26.0503 24.2929 27.9498 23.1213 29.1214L16.2426 36.0001L23.1213 42.8787C24.2929 44.0503 24.2929 45.9498 23.1213 47.1214C21.9497 48.293 20.0503 48.293 18.8787 47.1214L9.87868 38.1214Z"
              fill="currentColor"
            />
            <path
              d="M62.1213 33.8787L53.1213 24.8787C51.9497 23.7072 50.0503 23.7072 48.8787 24.8787C47.7071 26.0503 47.7071 27.9498 48.8787 29.1214L55.7574 36.0001L48.8787 42.8787C47.7071 44.0503 47.7071 45.9498 48.8787 47.1214C50.0503 48.293 51.9497 48.293 53.1213 47.1214L62.1213 38.1214C63.2929 36.9498 63.2929 35.0503 62.1213 33.8787Z"
              fill="currentColor"
            />
          </g>
          <defs>
            <clipPath id="clip0_8_9064">
              <rect width="72" height="72" fill="white" />
            </clipPath>
          </defs>
        </svg>
      )}
      {icon === 'news' && (
        <svg
          className="me-2.5 text-primary dark:text-primary-dark"
          fill="none"
          width="24"
          height="24"
          viewBox="0 0 72 72"
          aria-hidden="true">
          <path
            fillRule="evenodd"
            clipRule="evenodd"
            d="M12.7101 56.3758C13.0724 56.7251 13.6324 57 14.3887 57H57.6113C58.3676 57 58.9276 56.7251 59.2899 56.3758C59.6438 56.0346 59.8987 55.5407 59.9086 54.864C59.9354 53.022 59.9591 50.7633 59.9756 48H12.0244C12.0409 50.7633 12.0645 53.022 12.0914 54.864C12.1013 55.5407 12.3562 56.0346 12.7101 56.3758ZM12.0024 42H59.9976C59.9992 41.0437 60 40.0444 60 39C60 29.5762 59.9327 22.5857 59.8589 17.7547C59.8359 16.2516 58.6168 15 56.9938 15L15.0062 15C13.3832 15 12.1641 16.2516 12.1411 17.7547C12.0673 22.5857 12 29.5762 12 39C12 40.0444 12.0008 41.0437 12.0024 42ZM65.8582 17.6631C65.7843 12.8227 61.8348 9 56.9938 9H15.0062C10.1652 9 6.21572 12.8227 6.1418 17.6631C6.06753 22.5266 6 29.5477 6 39C6 46.2639 6.03988 51.3741 6.09205 54.9515C6.15893 59.537 9.80278 63 14.3887 63H57.6113C62.1972 63 65.8411 59.537 65.9079 54.9515C65.9601 51.3741 66 46.2639 66 39C66 29.5477 65.9325 22.5266 65.8582 17.6631ZM39 21C37.3431 21 36 22.3431 36 24C36 25.6569 37.3431 27 39 27H51C52.6569 27 54 25.6569 54 24C54 22.3431 52.6569 21 51 21H39ZM36 33C36 31.3431 37.3431 30 39 30H51C52.6569 30 54 31.3431 54 33C54 34.6569 52.6569 36 51 36H39C37.3431 36 36 34.6569 36 33ZM24 33C27.3137 33 30 30.3137 30 27C30 23.6863 27.3137 21 24 21C20.6863 21 18 23.6863 18 27C18 30.3137 20.6863 33 24 33Z"
            fill="currentColor"
          />
        </svg>
      )}
      {children}
      <svg
        className="text-primary dark:text-primary-dark rtl:rotate-180"
        fill="none"
        width="24"
        height="24"
        viewBox="0 0 72 72"
        aria-hidden="true">
        <path
          className="transition-transform ease-in-out translate-x-[-8px] group-hover:translate-x-[8px]"
          fillRule="evenodd"
          clipRule="evenodd"
          d="M40.0001 19.0245C41.0912 17.7776 42.9864 17.6513 44.2334 18.7423L58.9758 33.768C59.6268 34.3377 60.0002 35.1607 60.0002 36.0257C60.0002 36.8908 59.6268 37.7138 58.9758 38.2835L44.2335 53.3078C42.9865 54.3988 41.0913 54.2725 40.0002 53.0256C38.9092 51.7786 39.0355 49.8835 40.2824 48.7924L52.4445 36.0257L40.2823 23.2578C39.0354 22.1667 38.9091 20.2714 40.0001 19.0245Z"
          fill="currentColor"
        />
        <path
          className="opacity-0 ease-in-out transition-opacity group-hover:opacity-100"
          d="M60 36.0273C60 37.6842 58.6569 39.0273 57 39.0273H15C13.3431 39.0273 12 37.6842 12 36.0273C12 34.3704 13.3431 33.0273 15 33.0273H57C58.6569 33.0273 60 34.3704 60 36.0273Z"
          fill="currentColor"
        />
      </svg>
    </Tag>
  );
}

const reactConf2021Cover = '/images/home/conf2021/cover.svg';
const reactConf2019Cover = '/images/home/conf2019/cover.svg';
const communityImages = [
  {
    src: '/images/home/community/react_conf_fun.webp',
    alt: 'People singing karaoke at React Conf',
  },
  {
    src: '/images/home/community/react_india_sunil.webp',
    alt: 'Sunil Pai speaking at React India',
  },
  {
    src: '/images/home/community/react_conf_hallway.webp',
    alt: 'A hallway conversation between two people at React Conf',
  },
  {
    src: '/images/home/community/react_india_hallway.webp',
    alt: 'A hallway conversation at React India',
  },
  {
    src: '/images/home/community/react_conf_elizabet.webp',
    alt: 'Elizabet Oliveira speaking at React Conf',
  },
  {
    src: '/images/home/community/react_india_selfie.webp',
    alt: 'People taking a group selfie at React India',
  },
  {
    src: '/images/home/community/react_conf_nat.webp',
    alt: 'Nat Alison speaking at React Conf',
  },
  {
    src: '/images/home/community/react_india_team.webp',
    alt: 'Organizers greeting attendees at React India',
  },
];

function CommunityGallery() {
  const ref = useRef();

  const [shouldPlay, setShouldPlay] = useState(false);
  useEffect(() => {
    const observer = new IntersectionObserver(
      (entries) => {
        entries.forEach((entry) => {
          setShouldPlay(entry.isIntersecting);
        });
      },
      {
        root: null,
        rootMargin: `${window.innerHeight}px 0px`,
      }
    );
    observer.observe(ref.current);
    return () => observer.disconnect();
  }, []);

  const [isLazy, setIsLazy] = useState(true);
  // Either wait until we're scrolling close...
  useEffect(() => {
    if (!isLazy) {
      return;
    }
    const rootVertical = parseInt(window.innerHeight * 2.5);
    const observer = new IntersectionObserver(
      (entries) => {
        entries.forEach((entry) => {
          if (entry.isIntersecting) {
            setIsLazy(false);
          }
        });
      },
      {
        root: null,
        rootMargin: `${rootVertical}px 0px`,
      }
    );
    observer.observe(ref.current);
    return () => observer.disconnect();
  }, [isLazy]);
  // ... or until it's been a while after hydration.
  useEffect(() => {
    const timeout = setTimeout(() => {
      setIsLazy(false);
    }, 20 * 1000);
    return () => clearTimeout(timeout);
  }, []);

  return (
    <div ref={ref} className="relative flex overflow-x-clip w-auto">
      <div
        className="w-full py-12 lg:py-20 whitespace-nowrap flex flex-row animate-marquee lg:animate-large-marquee"
        style={{
          animationPlayState: shouldPlay ? 'running' : 'paused',
        }}>
        <CommunityImages isLazy={isLazy} />
      </div>
      <div
        aria-hidden="true"
        className="w-full absolute top-0 py-12 lg:py-20 whitespace-nowrap flex flex-row animate-marquee2 lg:animate-large-marquee2"
        style={{
          animationPlayState: shouldPlay ? 'running' : 'paused',
        }}>
        <CommunityImages isLazy={isLazy} />
      </div>
    </div>
  );
}

const CommunityImages = memo(function CommunityImages({isLazy}) {
  return (
    <>
      {communityImages.map(({src, alt}, i) => (
        <div
          key={i}
          className={cn(
            `group flex justify-center px-5 min-w-[50%] lg:min-w-[25%] rounded-2xl`
          )}>
          <div
            className={cn(
              'h-auto rounded-2xl before:rounded-2xl before:absolute before:pointer-events-none before:inset-0 before:transition-opacity before:-z-1 before:shadow-lg lg:before:shadow-2xl before:opacity-0 before:group-hover:opacity-100  transition-transform ease-in-out duration-300',
              i % 2 === 0
                ? 'rotate-2 group-hover:rotate-[-1deg] group-hover:scale-110'
                : 'group-hover:rotate-1 group-hover:scale-110 rotate-[-2deg]'
            )}>
            <div
              className={cn(
                'overflow-clip relative before:absolute before:inset-0 before:pointer-events-none before:-translate-x-full group-hover:before:animate-[shimmer_1s_forwards] before:bg-gradient-to-r before:from-transparent before:via-white/10 before:to-transparent transition-transform ease-in-out duration-300'
              )}>
              <img
                loading={isLazy ? 'lazy' : 'eager'}
                src={src}
                alt={alt}
                className="aspect-[4/3] h-full w-full flex object-cover rounded-2xl bg-gray-10 dark:bg-gray-80"
              />
            </div>
          </div>
        </div>
      ))}
    </>
  );
});

function ExampleLayout({
  filename,
  left,
  right,
  activeArea,
  hoverTopOffset = 0,
}) {
  const contentRef = useRef(null);
  useNestedScrollLock(contentRef);

  const [overlayStyles, setOverlayStyles] = useState([]);
  useEffect(() => {
    if (activeArea) {
      const nodes = contentRef.current.querySelectorAll(
        '[data-hover="' + activeArea.name + '"]'
      );
      const nextOverlayStyles = Array.from(nodes)
        .map((node) => {
          const parentRect = contentRef.current.getBoundingClientRect();
          const nodeRect = node.getBoundingClientRect();
          let top = Math.round(nodeRect.top - parentRect.top) - 8;
          let bottom = Math.round(nodeRect.bottom - parentRect.top) + 8;
          let left = Math.round(nodeRect.left - parentRect.left) - 8;
          let right = Math.round(nodeRect.right - parentRect.left) + 8;
          top = Math.max(top, hoverTopOffset);
          bottom = Math.min(bottom, parentRect.height - 12);
          if (top >= bottom) {
            return null;
          }
          return {
            width: right - left + 'px',
            height: bottom - top + 'px',
            transform: `translate(${left}px, ${top}px)`,
          };
        })
        .filter((s) => s !== null);
      setOverlayStyles(nextOverlayStyles);
    }
  }, [activeArea, hoverTopOffset]);
  return (
    <div className="lg:ps-10 lg:pe-5 w-full">
      <div className="mt-12 mb-2 lg:my-16 max-w-7xl mx-auto flex flex-col w-full lg:rounded-2xl lg:bg-card lg:dark:bg-card-dark">
        <div className="flex-col gap-0 lg:gap-5 lg:rounded-2xl lg:bg-gray-10 lg:dark:bg-gray-70 shadow-inner-border dark:shadow-inner-border-dark lg:flex-row flex grow w-full mx-auto items-center bg-cover bg-center lg:bg-right ltr:lg:bg-[length:60%_100%] bg-no-repeat bg-meta-gradient dark:bg-meta-gradient-dark">
          <div className="lg:-m-5 h-full shadow-nav dark:shadow-nav-dark lg:rounded-2xl bg-wash dark:bg-gray-95 w-full flex grow flex-col">
            <div className="w-full bg-card dark:bg-wash-dark lg:rounded-t-2xl border-b border-black/5 dark:border-white/5">
              <h3 className="text-sm my-1 mx-5 text-tertiary dark:text-tertiary-dark select-none text-start">
                {filename}
              </h3>
            </div>
            {left}
          </div>
          <div
            ref={contentRef}
            className="relative mt-0 lg:-my-20 w-full p-2.5 xs:p-5 lg:p-10 flex grow justify-center"
            dir="ltr">
            {right}
            <div
              className={cn(
                'absolute z-10 inset-0 pointer-events-none transition-opacity transform-gpu',
                activeArea ? 'opacity-100' : 'opacity-0'
              )}>
              {overlayStyles.map((styles, i) => (
                <div
                  key={i}
                  className="top-0 start-0 bg-blue-30/5 border-2 border-link dark:border-link-dark absolute rounded-lg"
                  style={styles}
                />
              ))}
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}

function useCodeHover(areas) {
  const [hoverLine, setHoverLine] = useState(null);
  const area = areas.get(hoverLine);
  let meta;
  if (area) {
    const highlightLines = area.lines ?? [hoverLine];
    meta = '```js {' + highlightLines.map((l) => l + 1).join(',') + '}';
  }
  return [area, meta, setHoverLine];
}

const example1Areas = new Map([
  [2, {name: 'Video'}],
  [3, {name: 'Thumbnail'}],
  [4, {name: 'a'}],
  [5, {name: 'h3'}],
  [6, {name: 'p'}],
  [7, {name: 'a'}],
  [8, {name: 'LikeButton'}],
  [9, {name: 'Video'}],
]);

function Example1() {
  const [area, meta, onLineHover] = useCodeHover(example1Areas);
  return (
    <ExampleLayout
      filename="Video.js"
      activeArea={area}
      left={
        <CodeBlock
          onLineHover={onLineHover}
          isFromPackageImport={false}
          noShadow={true}
          noMargin={true}>
          <div meta={meta}>{`function Video({ video }) {
  return (
    <div>
      <Thumbnail video={video} />
      <a href={video.url}>
        <h3>{video.title}</h3>
        <p>{video.description}</p>
      </a>
      <LikeButton video={video} />
    </div>
  );
}
          `}</div>
        </CodeBlock>
      }
      right={
        <ExamplePanel height="113px">
          <Video
            video={{
              id: 'ex1-0',
              title: 'My video',
              description: 'Video description',
              image: 'blue',
              url: null,
            }}
          />
        </ExamplePanel>
      }
    />
  );
}

const example2Areas = new Map([
  [8, {name: 'VideoList'}],
  [9, {name: 'h2'}],
  [11, {name: 'Video', lines: [11]}],
  [13, {name: 'VideoList'}],
]);

function Example2() {
  const [area, meta, onLineHover] = useCodeHover(example2Areas);
  const videos = [
    {
      id: 'ex2-0',
      title: 'First video',
      description: 'Video description',
      image: 'blue',
    },
    {
      id: 'ex2-1',
      title: 'Second video',
      description: 'Video description',
      image: 'red',
    },
    {
      id: 'ex2-2',
      title: 'Third video',
      description: 'Video description',
      image: 'green',
    },
  ];

  return (
    <ExampleLayout
      filename="VideoList.js"
      activeArea={area}
      left={
        <CodeBlock
          onLineHover={onLineHover}
          isFromPackageImport={false}
          noShadow={true}
          noMargin={true}>
          <div meta={meta}>{`function VideoList({ videos, emptyHeading }) {
  const count = videos.length;
  let heading = emptyHeading;
  if (count > 0) {
    const noun = count > 1 ? 'Videos' : 'Video';
    heading = count + ' ' + noun;
  }
  return (
    <section>
      <h2>{heading}</h2>
      {videos.map(video =>
        <Video key={video.id} video={video} />
      )}
    </section>
  );
}`}</div>
        </CodeBlock>
      }
      right={
        <ExamplePanel height="22rem" noShadow={false} noPadding={true}>
          <div className="m-4">
            <VideoList videos={videos} />
          </div>
        </ExamplePanel>
      }
    />
  );
}

const example3Areas = new Map([
  [6, {name: 'SearchableVideoList'}],
  [7, {name: 'SearchInput', lines: [7, 8, 9]}],
  [8, {name: 'SearchInput', lines: [7, 8, 9]}],
  [9, {name: 'SearchInput', lines: [7, 8, 9]}],
  [10, {name: 'VideoList', lines: [10, 11, 12]}],
  [11, {name: 'VideoList', lines: [10, 11, 12]}],
  [12, {name: 'VideoList', lines: [10, 11, 12]}],
  [13, {name: 'SearchableVideoList'}],
]);

function Example3() {
  const [area, meta, onLineHover] = useCodeHover(example3Areas);
  const videos = [
    {
      id: 'vids-0',
      title: 'React: The Documentary',
      description: 'The origin story of React',
      image: '/images/home/videos/documentary.webp',
      url: 'https://www.youtube.com/watch?v=8pDqJVdNa44',
    },
    {
      id: 'vids-1',
      title: 'Rethinking Best Practices',
      description: 'Pete Hunt (2013)',
      image: '/images/home/videos/rethinking.jpg',
      url: 'https://www.youtube.com/watch?v=x7cQ3mrcKaY',
    },
    {
      id: 'vids-2',
      title: 'Introducing React Native',
      description: 'Tom Occhino (2015)',
      image: '/images/home/videos/rn.jpg',
      url: 'https://www.youtube.com/watch?v=KVZ-P-ZI6W4',
    },
    {
      id: 'vids-3',
      title: 'Introducing React Hooks',
      description: 'Sophie Alpert and Dan Abramov (2018)',
      image: '/images/home/videos/hooks.jpg',
      url: 'https://www.youtube.com/watch?v=V-QO-KO90iQ',
    },
    {
      id: 'vids-4',
      title: 'Introducing Server Components',
      description: 'Dan Abramov and Lauren Tan (2020)',
      image: '/images/home/videos/rsc.jpg',
      url: 'https://www.youtube.com/watch?v=TQQPAU21ZUw',
    },
  ];

  return (
    <ExampleLayout
      filename="SearchableVideoList.js"
      activeArea={area}
      hoverTopOffset={60}
      left={
        <CodeBlock
          onLineHover={onLineHover}
          isFromPackageImport={false}
          noShadow={true}
          noMargin={true}>
          <div meta={meta}>{`import { useState } from 'react';

function SearchableVideoList({ videos }) {
  const [searchText, setSearchText] = useState('');
  const foundVideos = filterVideos(videos, searchText);
  return (
    <>
      <SearchInput
        value={searchText}
        onChange={newText => setSearchText(newText)} />
      <VideoList
        videos={foundVideos}
        emptyHeading={\`No matches for “\${searchText}”\`} />
    </>
  );
}`}</div>
        </CodeBlock>
      }
      right={
        <BrowserChrome domain="example.com" path={'videos.html'}>
          <ExamplePanel
            noShadow={false}
            noPadding={true}
            contentMarginTop="72px"
            height="30rem">
            <h1 className="mx-4 mb-1 font-bold text-3xl text-primary">
              React Videos
            </h1>
            <p className="mx-4 mb-0 leading-snug text-secondary text-xl">
              A brief history of React
            </p>
            <div className="px-4 pb-4">
              <SearchableVideoList videos={videos} />
            </div>
          </ExamplePanel>
        </BrowserChrome>
      }
    />
  );
}

const example4Areas = new Map([
  [6, {name: 'ConferenceLayout'}],
  [7, {name: 'Suspense'}],
  [8, {name: 'SearchableVideoList'}],
  [9, {name: 'Suspense'}],
  [10, {name: 'ConferenceLayout'}],
  [17, {name: 'SearchableVideoList'}],
]);

function Example4() {
  const [area, meta, onLineHover] = useCodeHover(example4Areas);
  const [slug, setSlug] = useState('react-conf-2021');
  const [animate, setAnimate] = useState(false);

  function navigate(newSlug) {
    setSlug(newSlug);
    setAnimate(true);
  }

  return (
    <ExampleLayout
      filename="confs/[slug].js"
      activeArea={area}
      hoverTopOffset={60}
      left={
        <CodeBlock
          onLineHover={onLineHover}
          isFromPackageImport={false}
          noShadow={true}
          noMargin={true}>
          <div meta={meta}>{`import { db } from './database.js';
import { Suspense } from 'react';

async function ConferencePage({ slug }) {
  const conf = await db.Confs.find({ slug });
  return (
    <ConferenceLayout conf={conf}>
      <Suspense fallback={<TalksLoading />}>
        <Talks confId={conf.id} />
      </Suspense>
    </ConferenceLayout>
  );
}

async function Talks({ confId }) {
  const talks = await db.Talks.findAll({ confId });
  const videos = talks.map(talk => talk.video);
  return <SearchableVideoList videos={videos} />;
}`}</div>
        </CodeBlock>
      }
      right={
        <NavContext value={{slug, navigate}}>
          <BrowserChrome
            domain="example.com"
            path={'confs/' + slug}
            hasRefresh={true}
            hasPulse={true}>
            <ExamplePanel
              noPadding={true}
              noShadow={true}
              contentMarginTop="56px"
              height="35rem">
              <Suspense fallback={null}>
                <div style={{animation: animate ? 'fadein 200ms' : null}}>
                  <link rel="preload" href={reactConf2019Cover} as="image" />
                  <link rel="preload" href={reactConf2021Cover} as="image" />
                  <ConferencePage slug={slug} />
                </div>
              </Suspense>
            </ExamplePanel>
          </BrowserChrome>
        </NavContext>
      }
    />
  );
}

function useNestedScrollLock(ref) {
  useEffect(() => {
    let node = ref.current;
    let isLocked = false;
    let lastScroll = performance.now();

    function handleScroll() {
      if (!isLocked) {
        isLocked = true;
        node.style.pointerEvents = 'none';
      }
      lastScroll = performance.now();
    }

    function updateLock() {
      if (isLocked && performance.now() - lastScroll > 150) {
        isLocked = false;
        node.style.pointerEvents = '';
      }
    }

    window.addEventListener('scroll', handleScroll);
    const interval = setInterval(updateLock, 60);
    return () => {
      window.removeEventListener('scroll', handleScroll);
      clearInterval(interval);
    };
  }, [ref]);
}

function ExamplePanel({
  children,
  noPadding,
  noShadow,
  height,
  contentMarginTop,
}) {
  return (
    <div
      className={cn(
        'max-w-3xl rounded-2xl mx-auto text-secondary leading-normal bg-white overflow-hidden w-full overflow-y-auto',
        noShadow ? 'shadow-none' : 'shadow-nav dark:shadow-nav-dark'
      )}
      style={{height}}>
      <div
        className={noPadding ? 'p-0' : 'p-4'}
        style={{contentVisibility: 'auto', marginTop: contentMarginTop}}>
        {children}
      </div>
    </div>
  );
}

const NavContext = createContext(null);

function BrowserChrome({children, hasPulse, hasRefresh, domain, path}) {
  const [restartId, setRestartId] = useState(0);
  const isPulsing = hasPulse && restartId === 0;
  const [shouldAnimatePulse, setShouldAnimatePulse] = useState(false);
  const refreshRef = useRef(null);

  useEffect(() => {
    if (!isPulsing) {
      return;
    }
    const observer = new IntersectionObserver(
      (entries) => {
        entries.forEach((entry) => {
          setShouldAnimatePulse(entry.isIntersecting);
        });
      },
      {
        root: null,
        rootMargin: `0px 0px`,
      }
    );
    observer.observe(refreshRef.current);
    return () => observer.disconnect();
  }, [isPulsing]);

  function handleRestart() {
    confCache = new Map();
    talksCache = new Map();
    setRestartId((i) => i + 1);
  }

  return (
    <div className="mx-auto max-w-3xl shadow-nav dark:shadow-nav-dark relative overflow-hidden w-full dark:border-opacity-10 rounded-2xl">
      <div className="w-full h-14 rounded-t-2xl shadow-outer-border backdrop-filter overflow-hidden backdrop-blur-lg backdrop-saturate-200 bg-white bg-opacity-90 z-10 absolute top-0 px-3 gap-2 flex flex-row items-center">
        <div className="select-none h-8 relative bg-gray-30/20 text-sm text-tertiary text-center rounded-full w-full flex-row flex space-between items-center">
          {hasRefresh && <div className="h-4 w-6" />}
          <div className="w-full leading-snug flex flex-row items-center justify-center">
            <svg
              className="text-tertiary me-1 opacity-60"
              width="12"
              height="12"
              viewBox="0 0 44 44"
              fill="none"
              xmlns="http://www.w3.org/2000/svg">
              <path
                fillRule="evenodd"
                clipRule="evenodd"
                d="M22 4C17.0294 4 13 8.0294 13 13V16H12.3103C10.5296 16 8.8601 16.8343 8.2855 18.5198C7.6489 20.387 7 23.4148 7 28C7 32.5852 7.6489 35.613 8.2855 37.4802C8.8601 39.1657 10.5296 40 12.3102 40H31.6897C33.4704 40 35.1399 39.1657 35.7145 37.4802C36.3511 35.613 37 32.5852 37 28C37 23.4148 36.3511 20.387 35.7145 18.5198C35.1399 16.8343 33.4704 16 31.6897 16H31V13C31 8.0294 26.9706 4 22 4ZM25 16V13C25 11.3431 23.6569 10 22 10C20.3431 10 19 11.3431 19 13V16H25Z"
                fill="currentColor"
              />
            </svg>

            <span className="text-gray-30">
              {domain}
              {path != null && '/'}
            </span>
            {path}
          </div>
          {hasRefresh && (
            <div
              ref={refreshRef}
              className={cn(
                'relative rounded-full flex justify-center items-center ',
                isPulsing && shouldAnimatePulse && 'animation-pulse-button'
              )}>
              {isPulsing && shouldAnimatePulse && (
                <div className="z-0 absolute shadow-[0_0_0_8px_rgba(0,0,0,0.5)] inset-0 rounded-full animation-pulse-shadow" />
              )}
              <button
                aria-label="Reload"
                onClick={handleRestart}
                className={
                  'z-10 flex items-center p-1.5 rounded-full cursor-pointer justify-center' +
                  // bg-transparent hover:bg-gray-20/50,
                  // but opaque to obscure the pulsing wave.
                  ' bg-[#ebecef] hover:bg-[#d3d7de]'
                }>
                <IconRestart className="text-tertiary text-lg" />
              </button>
            </div>
          )}
        </div>
        {restartId > 0 && (
          <div
            key={restartId}
            className="z-10 loading h-0.5 bg-link transition-all duration-200 absolute bottom-0 start-0"
            style={{
              animation: `progressbar ${loadTalksDelay + 100}ms ease-in-out`,
            }}
          />
        )}
      </div>
      <div className="h-full flex flex-1" key={restartId}>
        {children}
      </div>
    </div>
  );
}

function ConferencePage({slug}) {
  const conf = use(fetchConf(slug));
  return (
    <ConferenceLayout conf={conf}>
      <div data-hover="Suspense">
        <Suspense fallback={<TalksLoading />}>
          <Talks confId={conf.id} />
        </Suspense>
      </div>
    </ConferenceLayout>
  );
}

function TalksLoading() {
  return (
    <div className="flex flex-col items-center h-[25rem] overflow-hidden">
      <div className="w-full">
        <div className="relative overflow-hidden before:-skew-x-12 before:absolute before:inset-0 before:-translate-x-full before:animate-[shimmer_2.5s_infinite] before:bg-gradient-to-r before:from-transparent before:via-white/50 before:to-transparent">
          <div className="space-y-4">
            <div className="pt-4 pb-1">
              <div className="h-10 w-full rounded-full bg-gray-10"></div>
            </div>
            <div className="pb-1">
              <div className="h-5 w-20 rounded-lg bg-gray-10"></div>
            </div>
            <div className="flex flex-row items-center gap-3">
              <div className="aspect-video w-32 xs:w-36 rounded-lg bg-gray-10"></div>
              <div className="flex flex-col gap-2">
                <div className="h-3 w-40 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-32 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-24 rounded-lg bg-gray-10"></div>
              </div>
            </div>
            <div className="flex flex-row items-center gap-3">
              <div className="aspect-video w-32 xs:w-36 rounded-lg bg-gray-10"></div>
              <div className="flex flex-col gap-2">
                <div className="h-3 w-40 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-32 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-24 rounded-lg bg-gray-10"></div>
              </div>
            </div>
            <div className="flex flex-row items-center gap-3">
              <div className="aspect-video w-32 xs:w-36 rounded-lg bg-gray-10"></div>
              <div className="flex flex-col gap-2">
                <div className="h-3 w-40 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-32 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-24 rounded-lg bg-gray-10"></div>
              </div>
            </div>
            <div className="flex flex-row items-center gap-3">
              <div className="aspect-video w-32 xs:w-36 rounded-lg bg-gray-10"></div>
              <div className="flex flex-col gap-2">
                <div className="h-3 w-40 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-32 rounded-lg bg-gray-10"></div>
                <div className="h-3 w-24 rounded-lg bg-gray-10"></div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}

function Talks({confId}) {
  const videos = use(fetchTalks(confId));
  return <SearchableVideoList videos={videos} />;
}

function SearchableVideoList({videos}) {
  const [searchText, setSearchText] = useState('');
  const foundVideos = filterVideos(videos, searchText);
  return (
    <div className="mt-3" data-hover="SearchableVideoList">
      <SearchInput value={searchText} onChange={setSearchText} />
      <VideoList
        videos={foundVideos}
        emptyHeading={`No matches for “${searchText}”`}
      />
    </div>
  );
}

function filterVideos(videos, query) {
  const keywords = query
    .toLowerCase()
    .split(' ')
    .filter((s) => s !== '');
  if (keywords.length === 0) {
    return videos;
  }
  return videos.filter((video) => {
    const words = (video.title + ' ' + video.description)
      .toLowerCase()
      .split(' ');
    return keywords.every((kw) => words.some((w) => w.startsWith(kw)));
  });
}

function VideoList({videos, emptyHeading}) {
  let heading = emptyHeading;
  const count = videos.length;
  if (count > 0) {
    const noun = count > 1 ? 'Videos' : 'Video';
    heading = count + ' ' + noun;
  }
  return (
    <section className="relative" data-hover="VideoList">
      <h2
        className="font-bold text-xl text-primary mb-4 leading-snug"
        data-hover="h2">
        {heading}
      </h2>
      <div className="flex flex-col gap-4">
        {videos.map((video) => (
          <Video key={video.id} video={video} />
        ))}
      </div>
    </section>
  );
}

function SearchInput({value, onChange}) {
  const id = useId();
  return (
    <form
      className="mb-3 py-1"
      data-hover="SearchInput"
      onSubmit={(e) => e.preventDefault()}>
      <label htmlFor={id} className="sr-only">
        Search
      </label>
      <div className="relative w-full">
        <div className="absolute inset-y-0 start-0 flex items-center ps-4 pointer-events-none">
          <IconSearch className="text-gray-30 w-4" />
        </div>
        <input
          type="text"
          id={id}
          className="flex ps-11 py-4 h-10 w-full text-start bg-secondary-button outline-none betterhover:hover:bg-opacity-80 pointer items-center text-primary rounded-full align-middle text-base"
          placeholder="Search"
          value={value}
          onChange={(e) => onChange(e.target.value)}
        />
      </div>
    </form>
  );
}

function ConferenceLayout({conf, children}) {
  const {slug, navigate} = useContext(NavContext);
  const [isPending, startTransition] = useTransition();
  return (
    <div
      className={cn(
        'transition-opacity delay-100',
        isPending ? 'opacity-90' : 'opacity-100'
      )}
      data-hover="ConferenceLayout">
      <Cover background={conf.cover}>
        <select
          aria-label="Event"
          defaultValue={slug}
          onChange={(e) => {
            startTransition(() => {
              navigate(e.target.value);
            });
          }}
          className="appearance-none pe-8 ps-2 bg-transparent text-primary-dark text-2xl font-bold mb-0.5"
          style={{
            backgroundSize: '4px 4px, 4px 4px',
            backgroundRepeat: 'no-repeat',
            backgroundPosition:
              'calc(100% - 20px) calc(1px + 50%),calc(100% - 16px) calc(1px + 50%)',
            backgroundImage:
              'linear-gradient(45deg,transparent 50%,currentColor 50%),linear-gradient(135deg,currentColor 50%,transparent 50%)',
          }}>
          <option
            className="bg-wash dark:bg-wash-dark text-primary dark:text-primary-dark"
            value="react-conf-2021">
            React Conf 2021
          </option>
          <option
            className="bg-wash dark:bg-wash-dark text-primary dark:text-primary-dark"
            value="react-conf-2019">
            React Conf 2019
          </option>
        </select>
      </Cover>
      <div className="px-4 pb-4" key={conf.id}>
        {children}
      </div>
    </div>
  );
}

function Cover({background, children}) {
  return (
    <div className="h-40 overflow-hidden relative items-center flex">
      <div className="absolute inset-0 px-4 py-2 flex items-end bg-gradient-to-t from-black/40 via-black/0">
        {children}
      </div>
      <img
        src={background}
        width={500}
        height={263}
        alt=""
        className="w-full object-cover"
      />
    </div>
  );
}

function Video({video}) {
  return (
    <div className="flex flex-row items-center gap-3" data-hover="Video">
      <Thumbnail video={video} />
      <a
        href={video.url}
        target="_blank"
        rel="noreferrer"
        className="outline-link dark:outline-link outline-offset-4 group flex flex-col flex-1 gap-0.5"
        data-hover="a">
        <h3
          className={cn(
            'text-base leading-tight text-primary font-bold',
            video.url && 'group-hover:underline'
          )}
          data-hover="h3">
          {video.title}
        </h3>
        <p className="text-tertiary text-sm leading-snug" data-hover="p">
          {video.description}
        </p>
      </a>
      <LikeButton video={video} />
    </div>
  );
}

function Code({children}) {
  return (
    <code
      dir="ltr"
      className="font-mono inline rounded-lg bg-gray-15/40 dark:bg-secondary-button-dark py-0.5 px-1 text-left">
      {children}
    </code>
  );
}

function Thumbnail({video}) {
  const {image} = video;
  return (
    <a
      data-hover="Thumbnail"
      href={video.url}
      target="_blank"
      rel="noreferrer"
      aria-hidden="true"
      tabIndex={-1}
      className={cn(
        'outline-link dark:outline-link outline-offset-2 aspect-video w-32 xs:w-36 select-none flex-col shadow-inner-border rounded-lg flex items-center overflow-hidden justify-center align-middle text-white/50 bg-cover bg-white bg-[conic-gradient(at_top_right,_var(--tw-gradient-stops))]',
        image === 'blue' && 'from-yellow-50 via-blue-50 to-purple-60',
        image === 'red' && 'from-yellow-50 via-red-50 to-purple-60',
        image === 'green' && 'from-yellow-50 via-green-50 to-purple-60',
        image === 'purple' && 'from-yellow-50 via-purple-50 to-purple-60',
        typeof image === 'object' && 'from-gray-80 via-gray-95 to-gray-70',
        video.url && 'hover:opacity-95 transition-opacity'
      )}
      style={{
        backgroundImage:
          typeof image === 'string' && image.startsWith('/')
            ? 'url(' + image + ')'
            : null,
      }}>
      {typeof image !== 'string' ? (
        <>
          <div className="transition-opacity mt-2.5 -space-x-2 flex flex-row w-full justify-center">
            {image.speakers.map((src, i) => (
              <img
                key={i}
                className="h-8 w-8 border-2 shadow-md border-gray-70 object-cover rounded-full"
                src={src}
                alt=""
              />
            ))}
          </div>
          <div className="mt-1">
            <span className="inline-flex text-xs font-normal items-center text-primary-dark py-1 whitespace-nowrap outline-link px-1.5 rounded-lg">
              <Logo className="text-xs me-1 w-4 h-4 text-brand text-brand-dark" />
              React Conf
            </span>
          </div>
        </>
      ) : image.startsWith('/') ? null : (
        <ThumbnailPlaceholder />
      )}
    </a>
  );
}

function ThumbnailPlaceholder() {
  return (
    <svg
      className="drop-shadow-xl"
      width="36"
      height="36"
      viewBox="0 0 72 72"
      fill="none"
      xmlns="http://www.w3.org/2000/svg">
      <path
        fillRule="evenodd"
        clipRule="evenodd"
        d="M36 69C54.2254 69 69 54.2254 69 36C69 17.7746 54.2254 3 36 3C17.7746 3 3 17.7746 3 36C3 54.2254 17.7746 69 36 69ZM52.1716 38.6337L28.4366 51.5801C26.4374 52.6705 24 51.2235 24 48.9464V23.0536C24 20.7764 26.4374 19.3295 28.4366 20.4199L52.1716 33.3663C54.2562 34.5034 54.2562 37.4966 52.1716 38.6337Z"
        fill="currentColor"
      />
    </svg>
  );
}

// A hack since we don't actually have a backend.
// Unlike local state, this survives videos being filtered.
const likedVideos = new Set();

function LikeButton({video}) {
  const [isLiked, setIsLiked] = useState(() => likedVideos.has(video.id));
  const [animate, setAnimate] = useState(false);
  return (
    <button
      data-hover="LikeButton"
      className={cn(
        'outline-none focus:bg-red-50/5 focus:text-red-50 relative flex items-center justify-center w-10 h-10 cursor-pointer rounded-full hover:bg-card active:scale-95 active:bg-red-50/5 active:text-red-50',
        isLiked ? 'text-red-50' : 'text-tertiary'
      )}
      aria-label={isLiked ? 'Unsave' : 'Save'}
      onClick={() => {
        const nextIsLiked = !isLiked;
        if (nextIsLiked) {
          likedVideos.add(video.id);
        } else {
          likedVideos.delete(video.id);
        }
        setAnimate(true);
        setIsLiked(nextIsLiked);
      }}>
      <svg
        className="absolute overflow-visible"
        viewBox="0 0 24 24"
        fill="none"
        xmlns="http://www.w3.org/2000/svg">
        <circle
          className={cn(
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}

function NativeIcons() {
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function WebIcons() {
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        />
        <path
          d="m31.654 31.661 2.3887 2.3887m51.954 51.954 2.3887 2.3887"
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          strokeLinecap="square"
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          d="m36.935 27.134 1.9376 2.7672m42.143 60.186 1.9376 2.7672"
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          d="m49.59 21.297 0.8743 3.263m19.016 70.97 0.8743 3.263"
          stroke="#fff"
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          d="m56.449 20.063 0.2944 3.3653m6.4037 73.194 0.2944 3.3652"
          stroke="#fff"
          strokeLinecap="square"
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        <path
          d="m91.222 33.87-34.71 22.211-27.785 30.15 34.879-21.704 27.616-30.656z"
          clipRule="evenodd"
          fill="#fff"
          fillRule="evenodd"
        />
        <path
          d="m91.222 33.87-34.71 22.211 7.094 8.4453 27.616-30.656z"
          clipRule="evenodd"
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            x2="59.999"
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            <stop stopColor="#28CEFB" offset="1" />
          </linearGradient>
        </defs>
      </SvgContainer>
    </div>
  );
}

// TODO: upgrade React and use the built-in version.
function use(promise) {
  if (promise.status === 'fulfilled') {
    return promise.value;
  } else if (promise.status === 'rejected') {
    throw promise.reason;
  } else if (promise.status === 'pending') {
    throw promise;
  } else {
    promise.status = 'pending';
    promise.then(
      (result) => {
        promise.status = 'fulfilled';
        promise.value = result;
      },
      (reason) => {
        promise.status = 'rejected';
        promise.reason = reason;
      }
    );
    throw promise;
  }
}

let confCache = new Map();
let talksCache = new Map();
const loadConfDelay = 250;
const loadTalksDelay = 1000;

function fetchConf(slug) {
  if (confCache.has(slug)) {
    return confCache.get(slug);
  }
  const promise = new Promise((resolve) => {
    setTimeout(() => {
      if (slug === 'react-conf-2021') {
        resolve({
          id: 0,
          cover: reactConf2021Cover,
          name: 'React Conf 2021',
        });
      } else if (slug === 'react-conf-2019') {
        resolve({
          id: 1,
          cover: reactConf2019Cover,
          name: 'React Conf 2019',
        });
      }
    }, loadConfDelay);
  });
  confCache.set(slug, promise);
  return promise;
}

function fetchTalks(confId) {
  if (talksCache.has(confId)) {
    return talksCache.get(confId);
  }
  const promise = new Promise((resolve) => {
    setTimeout(() => {
      if (confId === 0) {
        resolve([
          {
            id: 'conf-2021-0',
            title: 'React 18 Keynote',
            description: 'The React Team',
            url: 'https://www.youtube.com/watch?v=FZ0cG47msEk&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=1',
            image: {
              speakers: [
                '/images/home/conf2021/andrew.jpg',
                '/images/home/conf2021/lauren.jpg',
                '/images/home/conf2021/juan.jpg',
                '/images/home/conf2021/rick.jpg',
              ],
            },
          },
          {
            id: 'conf-2021-1',
            title: 'React 18 for App Developers',
            description: 'Shruti Kapoor',
            url: 'https://www.youtube.com/watch?v=ytudH8je5ko&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=2',
            image: {
              speakers: ['/images/home/conf2021/shruti.jpg'],
            },
          },
          {
            id: 'conf-2021-2',
            title: 'Streaming Server Rendering with Suspense',
            description: 'Shaundai Person',
            url: 'https://www.youtube.com/watch?v=pj5N-Khihgc&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=3',
            image: {
              speakers: ['/images/home/conf2021/shaundai.jpg'],
            },
          },
          {
            id: 'conf-2021-3',
            title: 'The First React Working Group',
            description: 'Aakansha Doshi',
            url: 'https://www.youtube.com/watch?v=qn7gRClrC9U&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=4',
            image: {
              speakers: ['/images/home/conf2021/aakansha.jpg'],
            },
          },
          {
            id: 'conf-2021-4',
            title: 'React Developer Tooling',
            description: 'Brian Vaughn',
            url: 'https://www.youtube.com/watch?v=oxDfrke8rZg&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=5',
            image: {
              speakers: ['/images/home/conf2021/brian.jpg'],
            },
          },
          {
            id: 'conf-2021-5',
            title: 'React without memo',
            description: 'Xuan Huang (黄玄)',
            url: 'https://www.youtube.com/watch?v=lGEMwh32soc&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=6',
            image: {
              speakers: ['/images/home/conf2021/xuan.jpg'],
            },
          },
          {
            id: 'conf-2021-6',
            title: 'React Docs Keynote',
            description: 'Rachel Nabors',
            url: 'https://www.youtube.com/watch?v=mneDaMYOKP8&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=7',
            image: {
              speakers: ['/images/home/conf2021/rachel.jpg'],
            },
          },
          {
            id: 'conf-2021-7',
            title: 'Things I Learnt from the New React Docs',
            description: "Debbie O'Brien",
            url: 'https://www.youtube.com/watch?v=-7odLW_hG7s&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=8',
            image: {
              speakers: ['/images/home/conf2021/debbie.jpg'],
            },
          },
          {
            id: 'conf-2021-8',
            title: 'Learning in the Browser',
            description: 'Sarah Rainsberger',
            url: 'https://www.youtube.com/watch?v=5X-WEQflCL0&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=9',
            image: {
              speakers: ['/images/home/conf2021/sarah.jpg'],
            },
          },
          {
            id: 'conf-2021-9',
            title: 'The ROI of Designing with React',
            description: 'Linton Ye',
            url: 'https://www.youtube.com/watch?v=7cPWmID5XAk&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=10',
            image: {
              speakers: ['/images/home/conf2021/linton.jpg'],
            },
          },
          {
            id: 'conf-2021-10',
            title: 'Interactive Playgrounds with React',
            description: 'Delba de Oliveira',
            url: 'https://www.youtube.com/watch?v=zL8cz2W0z34&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=11',
            image: {
              speakers: ['/images/home/conf2021/delba.jpg'],
            },
          },
          {
            id: 'conf-2021-11',
            title: 'Re-introducing Relay',
            description: 'Robert Balicki',
            url: 'https://www.youtube.com/watch?v=lhVGdErZuN4&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=12',
            image: {
              speakers: ['/images/home/conf2021/robert.jpg'],
            },
          },
          {
            id: 'conf-2021-12',
            title: 'React Native Desktop',
            description: 'Eric Rozell and Steven Moyes',
            url: 'https://www.youtube.com/watch?v=9L4FFrvwJwY&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=13',
            image: {
              speakers: [
                '/images/home/conf2021/eric.jpg',
                '/images/home/conf2021/steven.jpg',
              ],
            },
          },
          {
            id: 'conf-2021-13',
            title: 'On-device Machine Learning for React Native',
            description: 'Roman Rädle',
            url: 'https://www.youtube.com/watch?v=NLj73vrc2I8&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=14',
            image: {
              speakers: ['/images/home/conf2021/roman.jpg'],
            },
          },
          {
            id: 'conf-2021-14',
            title: 'React 18 for External Store Libraries',
            description: 'Daishi Kato',
            url: 'https://www.youtube.com/watch?v=oPfSC5bQPR8&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=15',
            image: {
              speakers: ['/images/home/conf2021/daishi.jpg'],
            },
          },
          {
            id: 'conf-2021-15',
            title: 'Building Accessible Components with React 18',
            description: 'Diego Haz',
            url: 'https://www.youtube.com/watch?v=dcm8fjBfro8&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=16',
            image: {
              speakers: ['/images/home/conf2021/diego.jpg'],
            },
          },
          {
            id: 'conf-2021-16',
            title: 'Accessible Japanese Form Components with React',
            description: 'Tafu Nakazaki',
            url: 'https://www.youtube.com/watch?v=S4a0QlsH0pU&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=17',
            image: {
              speakers: ['/images/home/conf2021/tafu.jpg'],
            },
          },
          {
            id: 'conf-2021-17',
            title: 'UI Tools for Artists',
            description: 'Lyle Troxell',
            url: 'https://www.youtube.com/watch?v=b3l4WxipFsE&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=18',
            image: {
              speakers: ['/images/home/conf2021/lyle.jpg'],
            },
          },
          {
            id: 'conf-2021-18',
            title: 'Hydrogen + React 18',
            description: 'Helen Lin',
            url: 'https://www.youtube.com/watch?v=HS6vIYkSNks&list=PLNG_1j3cPCaZZ7etkzWA7JfdmKWT0pMsa&index=19',
            image: {
              speakers: ['/images/home/conf2021/helen.jpg'],
            },
          },
        ]);
      } else if (confId === 1) {
        resolve([
          {
            id: 'conf-2019-0',
            title: 'Keynote (Part 1)',
            description: 'Tom Occhino',
            url: 'https://www.youtube.com/watch?v=QnZHO7QvjaM&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh',
            image: {
              speakers: ['/images/home/conf2019/tom.jpg'],
            },
          },
          {
            id: 'conf-2019-1',
            title: 'Keynote (Part 2)',
            description: 'Yuzhi Zheng',
            url: 'https://www.youtube.com/watch?v=uXEEL9mrkAQ&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=2',
            image: {
              speakers: ['https://conf2019.reactjs.org/img/speakers/yuzhi.jpg'],
            },
          },
          {
            id: 'conf-2019-2',
            title: 'Building The New Facebook With React and Relay (Part 1)',
            description: 'Frank Yan',
            url: 'https://www.youtube.com/watch?v=9JZHodNR184&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=3',
            image: {
              speakers: ['/images/home/conf2019/frank.jpg'],
            },
          },
          {
            id: 'conf-2019-3',
            title: 'Building The New Facebook With React and Relay (Part 2)',
            description: 'Ashley Watkins',
            url: 'https://www.youtube.com/watch?v=KT3XKDBZW7M&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=4',
            image: {
              speakers: ['/images/home/conf2019/ashley.jpg'],
            },
          },
          {
            id: 'conf-2019-4',
            title: 'How Our Team Is Using React Native to Save The World',
            description: 'Tania Papazafeiropoulou',
            url: 'https://www.youtube.com/watch?v=zVHWugBPGBE&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=5',
            image: {
              speakers: ['/images/home/conf2019/tania.jpg'],
            },
          },
          {
            id: 'conf-2019-5',
            title:
              'Using Hooks and Codegen to Bring the Benefits of GraphQL to REST APIs',
            description: 'Tejas Kumar',
            url: 'https://www.youtube.com/watch?v=cdsnzfJUqm0&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=6',
            image: {
              speakers: ['/images/home/conf2019/tejas.jpg'],
            },
          },
          {
            id: 'conf-2019-6',
            title: 'Building a Custom React Renderer',
            description: 'Sophie Alpert',
            url: 'https://www.youtube.com/watch?v=CGpMlWVcHok&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=7',
            image: {
              speakers: ['/images/home/conf2019/sophie.jpg'],
            },
          },
          {
            id: 'conf-2019-7',
            title: 'Is React Translated Yet?',
            description: 'Nat Alison',
            url: 'https://www.youtube.com/watch?v=lLE4Jqaek5k&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=12',
            image: {
              speakers: ['/images/home/conf2019/nat.jpg'],
            },
          },
          {
            id: 'conf-2019-8',
            title: 'Building (And Re-Building) the Airbnb Design System',
            description: 'Maja Wichrowska and Tae Kim',
            url: 'https://www.youtube.com/watch?v=fHQ1WSx41CA&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=13',
            image: {
              speakers: [
                '/images/home/conf2019/maja.jpg',
                '/images/home/conf2019/tae.jpg',
              ],
            },
          },
          {
            id: 'conf-2019-9',
            title: 'Accessibility Is a Marathon, Not a Sprint',
            description: 'Brittany Feenstra',
            url: 'https://www.youtube.com/watch?v=ONSD-t4gBb8&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=14',
            image: {
              speakers: ['/images/home/conf2019/brittany.jpg'],
            },
          },
          {
            id: 'conf-2019-10',
            title: 'The State of React State in 2019',
            description: 'Becca Bailey',
            url: 'https://www.youtube.com/watch?v=wUMMUyQtMSg&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=15',
            image: {
              speakers: ['/images/home/conf2019/becca.jpg'],
            },
          },
          {
            id: 'conf-2019-11',
            title: 'Let’s Program Like It’s 1999',
            description: 'Lee Byron',
            url: 'https://www.youtube.com/watch?v=vG8WpLr6y_U&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=16',
            image: {
              speakers: ['/images/home/conf2019/lee.jpg'],
            },
          },
          {
            id: 'conf-2019-12',
            title: 'React Developer Tooling',
            description: 'Brian Vaughn',
            url: 'https://www.youtube.com/watch?v=Mjrfb1r3XEM&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=17',
            image: {
              speakers: ['/images/home/conf2019/brian.jpg'],
            },
          },
          {
            id: 'conf-2019-13',
            title: 'Data Fetching With Suspense In Relay',
            description: 'Joe Savona',
            url: 'https://www.youtube.com/watch?v=Tl0S7QkxFE4&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=18',
            image: {
              speakers: ['/images/home/conf2019/joe.jpg'],
            },
          },
          {
            id: 'conf-2019-14',
            title: 'Automatic Visualizations of the Frontend',
            description: 'Cameron Yick',
            url: 'https://www.youtube.com/watch?v=SbreAPNmZOk&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=19',
            image: {
              speakers: ['/images/home/conf2019/cameron.jpg'],
            },
          },
          {
            id: 'conf-2019-15',
            title: 'React Is Fiction',
            description: 'Jenn Creighton',
            url: 'https://www.youtube.com/watch?v=kqh4lz2Lkzs&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=20',
            image: {
              speakers: ['/images/home/conf2019/jenn.jpg'],
            },
          },
          {
            id: 'conf-2019-16',
            title: 'Progressive Web Animations',
            description: 'Alexandra Holachek',
            url: 'https://www.youtube.com/watch?v=laPsceJ4tTY&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=21',
            image: {
              speakers: ['/images/home/conf2019/alexandra.jpg'],
            },
          },
          {
            id: 'conf-2019-17',
            title:
              'Creating Games, Animations and Interactions with the Wick Editor',
            description: 'Luca Damasco',
            url: 'https://www.youtube.com/watch?v=laPsceJ4tTY&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=21',
            image: {
              speakers: ['/images/home/conf2019/luca.jpg'],
            },
          },
          {
            id: 'conf-2019-18',
            title: 'Building React-Select',
            description: 'Jed Watson',
            url: 'https://www.youtube.com/watch?v=yS0jUnmBujE&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=25',
            image: {
              speakers: ['/images/home/conf2019/jed.jpg'],
            },
          },
          {
            id: 'conf-2019-19',
            title: 'Promoting Transparency in Government Spending with React',
            description: 'Lizzie Salita',
            url: 'https://www.youtube.com/watch?v=CVfXICcNfHE&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=26',
            image: {
              speakers: ['/images/home/conf2019/lizzie.jpg'],
            },
          },
          {
            id: 'conf-2019-20',
            title: 'Wonder-driven Development: Using React to Make a Spaceship',
            description: 'Alex Anderson',
            url: 'https://www.youtube.com/watch?v=aV0uOPWHKt4&list=PLPxbbTqCLbGHPxZpw4xj_Wwg8-fdNxJRh&index=27',
            image: {
              speakers: ['/images/home/conf2019/alex.jpg'],
            },
          },
        ]);
      }
    }, loadTalksDelay);
  });
  talksCache.set(confId, promise);
  return promise;
}