Реагировать на неожиданный «токен» экспорта при внедрении сервисной работы

Question

Я довольно новичок, чтобы реагировать, и сейчас пытаюсь внедрить работника сервиса. На самом деле я всегда получаю ошибку «Uncaught SyntaxError: неожиданный токен« export »» в моем классе «serviceworker. js».

Вот мой файл main.tsx.

import React from 'react';
import ReactDOM from 'react-dom';
import 'bootstrap/dist/css/bootstrap.css';
import App from './app/app';
import * as registerServiceWorker from './serviceworker/serviceworker';

ReactDOM.render(<App />, document.getElementById('root'));
registerServiceWorker.register();

И это мой файл "serviceworker. js".

 const isLocalhost = Boolean(


  window.location.hostname === 'localhost' ||
     // [::1] is the IPv6 localhost address.
     window.location.hostname === '[::1]' ||
     // 127.0.0.1/8 is considered localhost for IPv4.
     window.location.hostname.match(
       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
     )
   )

    export function register(config) {
    if ('serviceWorker' in navigator) {
      // The URL constructor is available in all browsers that support SW.
      // const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
      // if (publicUrl.origin !== window.location.origin) {
      //   // Our service worker won't work if PUBLIC_URL is on a different origin
      //   // from what our page is served on. This might happen if a CDN is used to
      //
      //   return;
      // }

      window.addEventListener('load', () => {
        const swUrl = `/serviceworker/serviceworker.js`;

        if (isLocalhost) {
          // This is running on localhost. Let's check if a service worker still exists or not.
          checkValidServiceWorker(swUrl, config);

          // Add some additional logging to localhost, pointing developers to the
          // service worker/PWA documentation.
          navigator.serviceWorker.ready.then(() => {
            console.log(
              'This web app is being served cache-first by a service ' +
              'worker. To learn more,  '
            );
          });
        } else {
          // Is not localhost. Just register service worker
          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) {
                // At this point, the updated precached content has been fetched,
                // but the previous service worker will still serve the older
                // content until all client tabs are closed.
                console.log(
                  'New content is available and will be used when all ' +
                  'tabs for this page are closed. See  /CRA-PWA.'
                );

                // Execute callback
                if (config && config.onUpdate) {
                  config.onUpdate(registration);
                }
              } else {
                // At this point, everything has been precached.
                // It's the perfect time to display a
                // "Content is cached for offline use." message.
                console.log('Content is cached for offline use.');

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

  function checkValidServiceWorker(swUrl, config) {
    // Check if the service worker can be found. If it can't reload the page.
    fetch(swUrl)
      .then(response => {
        // Ensure service worker exists, and that we really are getting a JS file.
        const contentType = response.headers.get('content-type');
        if (
          response.status === 404 ||
          (contentType === null)
        ) {
          // No service worker found. Probably a different app. Reload the page.
          navigator.serviceWorker.ready.then(registration => {
            registration.unregister().then(() => {
              window.location.reload();
            });
          });
        } else {
          // Service worker found. Proceed as normal.
          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.ready.then(registration => {
        registration.unregister();
      });
    }
  }

Есть идеи, что я здесь не так сделал? Я уже добавил Babel, как предложено в этой теме реагировать на экспорт Неожиданный токен , но ошибка не исчезла. Я уже пытался экспортировать его через modules.export, но безуспешно.

Заранее спасибо!

РЕДАКТИРОВАТЬ: Вот как выглядит мой ".babelr c":

    {
  "presets": ["@babel/preset-react"],
  "plugins": [
    "babel-plugin-transform-export-extensions",
    "transform-es2015-modules-commonjs"
  ]
}

Answer 1

Вот как выглядит мой ".babelr c":

    {
  "presets": ["@babel/preset-react"],
  "plugins": [
    "babel-plugin-transform-export-extensions",
    "transform-es2015-modules-commonjs"
  ]
}