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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
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<meta property="og:title" content="Service Worker, A [gentle] introduction" />
<meta property="og:description" content="Maybe the most exciting browser API today" />
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</head>
<body>
<div class="progress">
<div class="progress-bar"></div>
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<div class="slides">
<div class="slide-wrapper">
<div class="slide" id="slide-1">
<div data-id="1" class="slide-overlay"></div>
<section class="slide-content"><h1 id="service-worker">Service Worker</h1>
<h2 id="-font-color-red-a-font-font-color-green-gentle-font-introduction"><font color=red>A</font> <font color=green>[gentle]</font> introduction</h2>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-2">
<div data-id="2" class="slide-overlay"></div>
<section class="slide-content"><h2 id="what-is-a-worker-">What is a Worker?</h2>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-3">
<div data-id="3" class="slide-overlay"></div>
<section class="slide-content"><h3 id="browsers-used-to-run-everything-in-one-thread">Browsers used to run everything in one thread</h3>
<pre><code class="lang-mermaid">sequenceDiagram
participant B as 🗔 Browser
participant X
B->X: HTTP requests, compute, DOM changes ...</code></pre>
<p><a href="https://developer.mozilla.org/en-US/docs/Tools/Performance/Scenarios/Intensive_JavaScript">🏋 Intensive Javascript</a></p>
<script>
document.currentScript.parentNode.addEventListener('mermaid', event => event.target.querySelectorAll('g:nth-child(4), line').forEach(e => e.style = 'visibility: hidden!important')) // hide lines
</script></section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-4">
<div data-id="4" class="slide-overlay"></div>
<section class="slide-content"><h3 id="workers-runs-javascript-in-another-thread">Workers runs Javascript in another thread</h3>
<pre><code class="lang-mermaid">sequenceDiagram
participant B as 🗔 Browser
participant W as 📃 Worker
B->>W: create</code></pre>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/API/Worker">📓 Worker API</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-5">
<div data-id="5" class="slide-overlay"></div>
<section class="slide-content"><h3 id="then-uses-events-to-communicate">Then uses events to communicate</h3>
<pre><code class="lang-mermaid">sequenceDiagram
participant B as 🗔 Browser
participant W as 📃 Worker
B->>W: create
loop events
W--xB: message
B--xW:
end</code></pre>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/API/Worker/postMessage">📯 postMessage</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-6">
<div data-id="6" class="slide-overlay"></div>
<section class="slide-content"><h3 id="there-are-three-kind-of-workers">There are three kind of Workers</h3>
<blockquote>
<p>All run background scripts independently of any UI</p>
</blockquote>
<ul>
<li>Web Workers <small class="fragment">since 2010, perform heavy computation, ex: pdfjs</small></li>
<li>Shared Workers <small class="fragment">since 2010, shared across same origin <del>webkit in 2015</del></small></li>
<li>Service Workers <small class="fragment">since 2014, control HTTP requests from same origin</small></li>
</ul>
<p><a href="https://www.w3.org/TR/workers/">👷 Workers</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-7">
<div data-id="7" class="slide-overlay"></div>
<section class="slide-content"><h2 id="let-s-talk-about-service-workers">Let's talk about Service workers</h2>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-8">
<div data-id="8" class="slide-overlay"></div>
<section class="slide-content"><h3 id="definition">Definition</h3>
<blockquote>
<p>A service worker acts as a proxy between the browser (your web application) and the network</p>
</blockquote>
<p>Main usages</p>
<ul>
<li>Offline access<pre><code class="lang-mermaid">graph LR
B("🗔") --> S("📃")
S -.- N("☁")
style B fill:none,stroke:none
style S fill:none,stroke:none
style N fill:none,stroke:none</code></pre>
</li>
<li>Push notifications<pre><code class="lang-mermaid">graph RL
N("🗨") --> S("📃")
S -.- B("🗔")
style B fill:none,stroke:none
style S fill:none,stroke:none
style N fill:none,stroke:none</code></pre>
<li class="fragment">and more...</li>
</li>
</ul>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API">📖 Service Worker API</a></p>
<script>
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event.target.classList.add('fragment', 'float-right')
event.target.style.marginTop = '-5rem'
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if (event.target.matches('li:nth-of-type(2) svg')) event.target.style.marginTop = '-8rem'
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</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-9">
<div data-id="9" class="slide-overlay"></div>
<section class="slide-content"><h3 id="it-uses-recent-async-apis">It uses recent async APIs</h3>
<p>support: chrome, mozilla, android, opera, edge, safari</p>
<ul>
<li>Promises <small class="fragment">construction to execute code after a task is fulfilled</small></li>
<li>postMessage <small class="fragment">method to communicate between contexts</small></li>
<li>fetch <small class="fragment">function to make simple HTTP requests, successor of XHR</small></li>
</ul>
<p><a href="https://jakearchibald.github.io/isserviceworkerready">✓ Is Service Worker Ready</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-10">
<div data-id="10" class="slide-overlay"></div>
<section class="slide-content"><h3 id="runs-under-conditions">Runs under conditions</h3>
<p>support: chrome, mozilla, android, opera, edge (development), safari (development)</p>
<ul>
<li>HTTPS only, same origin <small class="fragment">for security reason</small></li>
<li>No DOM access <small class="fragment">no <code>document</code>, nor <code>window</code></small></li>
<li>Behind flag <small class="fragment">in Edge & Safari Technical Preview</small></li>
</ul>
<p><a href="http://caniuse.com/#search=serviceworker">❔ Can I Use Service Worker</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-11">
<div data-id="11" class="slide-overlay"></div>
<section class="slide-content"><h2 id="how-to-use-it-">How to use it?</h2>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-12">
<div data-id="12" class="slide-overlay"></div>
<section class="slide-content"><h3 id="registration">Registration</h3>
<p>support: chrome, mozilla, android, opera, edge (development), safari (development)</p>
<p><code>main.js</code></p>
<pre><code class="lang-javascript"><pre class="editor editor-colors"><div class="line"><span class="source js"><span class="keyword control js"><span>if</span></span><span> </span><span class="meta brace round js"><span>(</span></span><span class="support class js"><span>navigator</span></span><span class="meta delimiter property period js"><span>.</span></span><span class="variable other property js"><span>serviceWorker</span></span><span class="meta brace round js"><span>)</span></span></span></div><div class="line"><span class="source js"><span> </span><span class="support class js"><span>navigator</span></span><span class="meta delimiter property period js"><span>.</span></span><span class="variable other property js"><span>serviceWorker</span></span></span></div><div class="line"><span class="source js"><span> </span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>register</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>/service-worker.js</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta delimiter object comma js"><span>,</span></span><span> </span><span class="meta brace curly js"><span>{</span></span><span> scope</span><span class="keyword operator js"><span>:</span></span><span> </span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>/</span><span class="punctuation definition string end js"><span>'</span></span></span><span> </span><span class="meta brace curly js"><span>}</span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></div><div class="line"><span class="source js"><span> </span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>then</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="meta function arrow js"><span class="meta parameters js"><span class="variable parameter function js"><span>registration</span></span></span><span> </span><span class="storage type function arrow js"><span>=></span></span></span><span> </span><span class="variable other object js"><span>registration</span></span><span class="meta delimiter property period js"><span>.</span></span><span class="variable other property js"><span>state</span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></div></pre></code></pre>
<p><span class="fragment">Multiple Service Workers must register distinct scopes</span></p>
<p><a href="https://developers.google.com/web/fundamentals/getting-started/primers/service-workers">🍰 Getting Started</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-13">
<div data-id="13" class="slide-overlay"></div>
<section class="slide-content"><h3 id="first-install">First install</h3>
<p>support: chrome, mozilla, android, opera, edge (development), safari (development)</p>
<p><code>service-worker.js</code></p>
<pre><code class="lang-javascript"><pre class="editor editor-colors"><div class="line"><span class="source js"><span class="variable other object js"><span>self</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>addEventListener</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>install</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta delimiter object comma js"><span>,</span></span><span> </span><span class="meta function arrow js"><span class="meta parameters js"><span class="variable parameter function js"><span>event</span></span></span><span> </span><span class="storage type function arrow js"><span>=></span></span></span><span> </span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="support class js"><span>event</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>waitUntil</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="comment block js"><span class="punctuation definition comment js"><span>/*</span></span><span> ready to activate </span><span class="punctuation definition comment js"><span>*/</span></span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></div></pre></code></pre>
<pre><code class="lang-mermaid">graph LR
P["🗔 page"] -. register .-> I("⚙ install")
I --> A("✔ activate")
I --> E("⚠ error")
style P fill:white
style I fill:white,stroke:#41b6e8
style A fill:white,stroke:green
style E fill:white,stroke:red</code></pre>
<p><a href="https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle#install">⚙ Service Worker Lifecycle</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-14">
<div data-id="14" class="slide-overlay"></div>
<section class="slide-content"><h3 id="next-visit">Next visit</h3>
<p>support: chrome, mozilla, android, opera, edge (development), safari (development)</p>
<ul>
<li>Activates only inside scope</li>
<li>Skip the <code>install</code> event handler</li>
</ul>
<pre><code class="lang-mermaid">graph LR
P["🗔 page"] -. in scope .-> A("✔ activate")
A -. control .-> P
click P callback "in the Service Worker Scope"
style P fill:white,stroke:lightgrey
style A fill:white,stroke:green</code></pre>
<p><a href="https://developers.google.com/web/fundamentals/primers/service-workers">👍 Service Worker: An Introduction</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-15">
<div data-id="15" class="slide-overlay"></div>
<section class="slide-content"><h3 id="upgrade-process">Upgrade process</h3>
<p>support: chrome, mozilla, android, opera, edge (development), safari (development)</p>
<p>New Service Worker will wait deactivation of the old one before it activates</p>
<pre><code class="lang-mermaid">graph LR
subgraph Old Service Worker
O("✔ activate") --> D("☠ deactivate")
end
subgraph New Service Worker
O("✔ activate") -. updatefound .-> I("⚙ install")
I -. waiting .-> A("✔ activate")
end
style O fill:white,stroke:lightgrey
style D fill:white,stroke:red
style I fill:white,stroke:#41b6e8
style A fill:white,stroke:green</code></pre>
<script>
document.currentScript.parentNode.addEventListener('mermaid', event => event.target.style.maxWidth = '90%')
</script>
<p><a href="https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle">✌ Service Worker Lifecycle</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-16">
<div data-id="16" class="slide-overlay"></div>
<section class="slide-content"><h3 id="emitted-events">Emitted events</h3>
<p>Main functional events</p>
<ul>
<li>fetch <small class="fragment">intercepted an HTTP request (made by main thread)</small></li>
<li>message <small class="fragment">received a message via postMessage</small></li>
<li>push <small class="fragment">received a push notification</small></li>
</ul>
<p><a href="https://developer.mozilla.org/fr/docs/Web/API/ServiceWorker">🗱 Service Worker events</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-17">
<div data-id="17" class="slide-overlay"></div>
<section class="slide-content"><h3 id="states-events-flow">States & events flow</h3>
<pre><code class="lang-mermaid">graph LR
A("✔ Activated") --> D{"⌛ Idle"}
D --> F("⚙ Handle event")
F --> D
D --> T["☠ Terminated"]
T --> F
style A fill:white,stroke:green
style D fill:white
style F fill:white,stroke:#41b6e8
style T fill:white,stroke:red</code></pre>
<script>
document.currentScript.parentNode.addEventListener('mermaid', event => event.target.style.maxWidth = '100%')
</script>
<p><span class="fragment">Service worker may <strong>terminate at any time</strong>!</span></p>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers">🌠 Using Service Workers</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-18">
<div data-id="18" class="slide-overlay"></div>
<section class="slide-content"><h2 id="avoid-pitfalls">Avoid pitfalls</h2>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-19">
<div data-id="19" class="slide-overlay"></div>
<section class="slide-content"><h3 id="persistence">Persistence</h3>
<blockquote>
<p>You cannot rely on global state within a service worker</p>
</blockquote>
<ul>
<li>No Local Storage</li>
<li>But IndexedDB (use a wrapper!)</li>
<li>Use the Cache interface</li>
</ul>
<p><a href="https://www.npmjs.com/package/localforage">🖥 Localforage</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-20">
<div data-id="20" class="slide-overlay"></div>
<section class="slide-content"><h3 id="tips">Tips</h3>
<ul>
<li>Beware of redirects, credentials, streams</li>
<li>Avoid puting version in script URL</li>
<li>Specific debug tools <small class="fragment">chrome://serviceworker-internals</small></li>
<li>By default first run does not <code>control</code> the main Thread</li>
</ul>
<p><a href="https://medium.com/@boopathi/service-workers-gotchas-44bec65eab3f">⚠ Service Workers gotchas</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-21">
<div data-id="21" class="slide-overlay"></div>
<section class="slide-content"><h2 id="let-s-go-offline-">Let's go offline!</h2>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-22">
<div data-id="22" class="slide-overlay"></div>
<section class="slide-content"><h3 id="offline-basics">Offline basics</h3>
<p>support: chrome, mozilla, android, opera, edge (development), safari (development)</p>
<p><code>service-worker.js</code></p>
<pre><code class="lang-javascript"><pre class="editor editor-colors"><div class="line"><span class="source js"><span class="storage modifier js"><span>const</span></span><span> </span><span class="constant other js"><span>CACHE</span></span><span> </span><span class="keyword operator assignment js"><span>=</span></span><span> </span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>my-awsome-pwa</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta delimiter object comma js"><span>,</span></span></span></div><div class="line"><span class="source js"><span class="storage modifier js"><span>const</span></span><span> </span><span class="constant other js"><span>FILES</span></span><span> </span><span class="keyword operator assignment js"><span>=</span></span><span> </span><span class="meta brace square js"><span>[</span></span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>/</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta delimiter object comma js"><span>,</span></span><span> </span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>/styles.css</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta delimiter object comma js"><span>,</span></span><span> </span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>/script.js</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta brace square js"><span>]</span></span></span></div><div class="line"><span class="source js"><span class="variable other object js"><span>self</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>addEventListener</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>install</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta delimiter object comma js"><span>,</span></span><span> </span><span class="meta function arrow js"><span class="meta parameters js"><span class="variable parameter function js"><span>event</span></span></span><span> </span><span class="storage type function arrow js"><span>=></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="support class js"><span>event</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>waitUntil</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="variable other object js"><span>caches</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="support function dom js"><span>open</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="constant other js"><span>CACHE</span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>then</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="meta function arrow js"><span class="meta parameters js"><span class="variable parameter function js"><span>cache</span></span></span><span> </span><span class="storage type function arrow js"><span>=></span></span></span><span> </span><span class="variable other object js"><span>cache</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>addAll</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="constant other js"><span>FILES</span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></div></pre></code></pre>
<p><a href="https://w3c.github.io/ServiceWorker/">📚 Service Worker specification</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-23">
<div data-id="23" class="slide-overlay"></div>
<section class="slide-content"><h3 id="cache-first-fallback-to-network">Cache first, fallback to network</h3>
<p>support: chrome, mozilla, android, opera, edge (development), safari (development)</p>
<p><code>service-worker.js</code> </p>
<pre><code class="lang-javascript"><pre class="editor editor-colors"><div class="line"><span class="source js"><span class="variable other object js"><span>self</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>addEventListener</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="string quoted single js"><span class="punctuation definition string begin js"><span>'</span></span><span>fetch</span><span class="punctuation definition string end js"><span>'</span></span></span><span class="meta delimiter object comma js"><span>,</span></span><span> </span><span class="meta function arrow js"><span class="meta parameters js"><span class="variable parameter function js"><span>event</span></span></span><span> </span><span class="storage type function arrow js"><span>=></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="support class js"><span>event</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>respondWith</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="variable other object js"><span>caches</span></span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="support function js"><span>match</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="support class js"><span>event</span></span><span class="meta delimiter property period js"><span>.</span></span><span class="variable other property js"><span>request</span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="meta method-call js"><span class="meta delimiter method period js"><span>.</span></span><span class="entity name function js"><span>then</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="meta function arrow js"><span class="meta parameters js"><span class="variable parameter function js"><span>response</span></span></span><span> </span><span class="storage type function arrow js"><span>=></span></span></span><span> response </span><span class="keyword operator logical js"><span>||</span></span><span> </span><span class="meta function-call js"><span class="entity name function js"><span>fetch</span></span><span class="meta arguments js"><span class="punctuation definition arguments begin bracket round js"><span>(</span></span><span class="support class js"><span>event</span></span><span class="meta delimiter property period js"><span>.</span></span><span class="variable other property js"><span>request</span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="meta method-call js"><span class="meta arguments js"><span> </span><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></span></span></div><div class="line"><span class="source js"><span class="meta method-call js"><span class="meta arguments js"><span class="punctuation definition arguments end bracket round js"><span>)</span></span></span></span></span></div></pre></code></pre>
<p><a href="https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#cache-falling-back-to-network">📴 Offline cookbook</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-24">
<div data-id="24" class="slide-overlay"></div>
<section class="slide-content"><h3 id="caching-strategies">Caching strategies</h3>
<ul>
<li>Cache only <small class="fragment">KISS Progressive Web Application</small></li>
<li>Cache first, falling back to network <small class="fragment">static assets</small></li>
<li>Network first, falling back to cache <small class="fragment">API resources</small></li>
<li>etc</li>
</ul>
<p><a href="https://workboxjs.org/">🗃 Workboxjs</a></p>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-25">
<div data-id="25" class="slide-overlay"></div>
<section class="slide-content"><h2 id="receive-notifications">Receive notifications</h2>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden" id="slide-26">
<div data-id="26" class="slide-overlay"></div>
<section class="slide-content"><h3 id="web-push-notification">Web push notification</h3>
<ul>
<li>Used to be complex <small class="fragment">vendor specific implementations</small></li>
<li>Fully standardized <small class="fragment">browser provides push server</small></li>
<li>Native notifications UI <small class="fragment">with user permission</small></li>
</ul>
<p><a href="https://developers.google.com/web/fundamentals/codelabs/push-notifications/">🚨 Push Notifications in Web App</a></p>
</section>
</div>
</div>