serviceWorkerRegistration.js

const PUBLIC_URL = 'https://www.checkmate.pe.kr/';

const isLocalhost = Boolean(
  window.location.hostname === 'localhost' ||
    window.location.hostname === '[::1]' ||
    window.location.hostname.match(
      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/,
    ),
);

export function register(config) {
  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
    const publicUrl = new URL(PUBLIC_URL, window.location.href);
    if (publicUrl.origin !== window.location.origin) {
      return;
    }

    window.addEventListener('load', () => {
      const swUrl = `${PUBLIC_URL}/service/service-worker.js`;

      if (isLocalhost) {
        checkValidServiceWorker(swUrl, config);

        navigator.serviceWorker.ready.then(() => {
          console.log(
            'This web app is being served cache-first by a service ' +
              'worker. To learn more, visit https://cra.link/PWA',
          );
        });
      } else {
        registerValidSW(swUrl, config);
      }
    });
  }
}

function registerValidSW(swUrl, config) {
  navigator.serviceWorker
    .register(swUrl)
    .then((registration) => {
      registration.onupdatefound = () => {
        const installingWorker = registration.installing;
        if (installingWorker == null) {
          return;
        }
        installingWorker.onstatechange = () => {
          if (installingWorker.state === 'installed') {
            if (navigator.serviceWorker.controller) {
              console.log(
                'New content is available and will be used when all ' +
                  'tabs for this page are closed. See https://cra.link/PWA.',
              );

              // 성공 콜백 실행
              if (config && config.onUpdate) {
                config.onUpdate(registration);
              }
            } else {
              console.log('Content is cached for offline use.');

              if (config && config.onSuccess) {
                config.onSuccess(registration);
              }
            }
          }
        };
      };
    })
    .catch((error) => {
      console.error('Error during service worker registration:', error);
    });
}

function checkValidServiceWorker(swUrl, config) {
  fetch(swUrl, {
    headers: { 'Service-Worker': 'script' },
  })
    .then((response) => {
      const contentType = response.headers.get('content-type');
      if (
        response.status === 404 ||
        (contentType != null && contentType.indexOf('javascript') === -1)
      ) {
        navigator.serviceWorker.ready.then((registration) => {
          registration.unregister().then(() => {
            window.location.reload();
          });
        });
      } else {
        registerValidSW(swUrl, config);
      }
    })
    .catch(() => {
      console.log(
        'No internet connection found. App is running in offline mode.',
      );
    });
}

export function unregister() {
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker
      .register('/service-worker.js')
      .then((registration) => {
        console.log(
          '서비스 워커가 다음 범위로 등록되었습니다:',
          registration.scope,
        );
      })
      .catch((error) => {
        console.error('서비스 워커 등록에 실패했습니다:', error);
      });
  } else {
    console.log('이 브라우저에서는 서비스 워커를 지원하지 않습니다.');
  }
}