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progressive-web-app

Progressive Web Apps with service workers, web manifest, offline support, installation prompts. Use for installable web apps, offline functionality, push notifications, or encountering service worker registration, cache strategy, manifest configuration errors.

Install with Tessl CLI

npx tessl i github:secondsky/claude-skills --skill progressive-web-app
What are skills?

89

Review — 89%

Does it follow best practices?

Validation — 13 / 16 Passed

Validation for skill structure

SKILL.md
Review
Evals

Progressive Web App (PWA)

Build web applications that work like native apps with offline support and installability.

Web App Manifest

{
  "name": "My Application",
  "short_name": "MyApp",
  "start_url": "/",
  "display": "standalone",
  "background_color": "#ffffff",
  "theme_color": "#000000",
  "icons": [
    { "src": "/icon-192.png", "sizes": "192x192", "type": "image/png" },
    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png" }
  ]
}

Service Worker

const CACHE_NAME = 'app-v1';
const STATIC_ASSETS = ['/', '/index.html', '/styles.css', '/app.js'];

// Install
self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME).then(cache => cache.addAll(STATIC_ASSETS))
  );
});

// Fetch with cache-first strategy
self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request).then(cached => {
      if (cached) return cached;

      return fetch(event.request).then(response => {
        if (response.status === 200) {
          const clone = response.clone();
          caches.open(CACHE_NAME).then(cache => cache.put(event.request, clone));
        }
        return response;
      });
    })
  );
});

Install Prompt

let deferredPrompt;

window.addEventListener('beforeinstallprompt', e => {
  e.preventDefault();
  deferredPrompt = e;
  showInstallButton();
});

async function installApp() {
  if (!deferredPrompt) return;
  deferredPrompt.prompt();
  const { outcome } = await deferredPrompt.userChoice;
  console.log('Install outcome:', outcome);
  deferredPrompt = null;
}

Push Notifications

async function subscribeToPush() {
  const registration = await navigator.serviceWorker.ready;
  const subscription = await registration.pushManager.subscribe({
    userVisibleOnly: true,
    applicationServerKey: VAPID_PUBLIC_KEY
  });
  await sendSubscriptionToServer(subscription);
}

PWA Checklist

  • HTTPS enabled
  • Web manifest configured
  • Service worker registered
  • Offline fallback page
  • Responsive design
  • Fast loading (<3s on 3G)
  • Installable
Repository
github.com/secondsky/claude-skills
Last updated
Created

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