Introduction to ‘Service Worker Mock’

‘Service Worker Mock’ is a powerful tool for testing and developing service workers in a controlled environment. This library allows simulating various scenarios and handling service worker events effortlessly. By providing dozens of useful APIs, developers can enhance their workflow and ensure the reliability of their service workers.

Useful API Examples

Mocking Fetch

  const { createFetch } = require('service-worker-mock');
  const fetch = createFetch();
  global.fetch = fetch;
  fetch.mockResponseOnce(JSON.stringify({ message: 'Hello from Service Worker!' }));
  fetch('https://example.com/api')
    .then(response => response.json())
    .then(data => console.log(data.message)); // Outputs: Hello from Service Worker!

Handling Events

  const { createEventListener } = require('service-worker-mock');
  const eventListener = createEventListener();
  global.addEventListener = eventListener.addEventListener.bind(eventListener);
  global.dispatchEvent = eventListener.dispatchEvent.bind(eventListener);
  
  self.addEventListener('install', (event) => {
    console.log('Service Worker Installing...');
  });
  
  dispatchEvent(new Event('install')); // Outputs: Service Worker Installing...

Caching Mock Requests

  const { createCache } = require('service-worker-mock');
  const cache = createCache();
  self.caches = cache;
  
  caches.open('test-cache').then(cache => {
    return cache.put('https://example.com', new Response('Cached content'));
  });

Respond with Cached Data

  fetch('https://example.com').then(response => {
    response.text().then(content => console.log(content)); // Outputs: Cached content
  });

App Example using Introduced APIs

  const { createFetch, createEventListener, createCache } = require('service-worker-mock');
  const fetch = createFetch();
  const eventListener = createEventListener();
  const cache = createCache();

  global.fetch = fetch;
  global.addEventListener = eventListener.addEventListener.bind(eventListener);
  global.dispatchEvent = eventListener.dispatchEvent.bind(eventListener);
  global.caches = cache;

  self.addEventListener('fetch', (event) => {
    event.respondWith(
      caches.match(event.request).then(response => response || fetch(event.request))
    );
  });

  caches.open('app-cache').then(cache => {
    return cache.addAll([
      '/',
      '/style.css',
      '/app.js'
    ]);
  });

  fetch.mockResponseOnce(JSON.stringify({ message: 'Hello from Mock Fetch' }));

  fetch('/api/greet').then(response => response.json()).then(data => {
    console.log(data.message); // Outputs: Hello from Mock Fetch
  });

This comprehensive guide demonstrates the usage of ‘Service Worker Mock’ for testing and developing robust service workers. By integrating these APIs, developers can significantly enhance their service worker development process.

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