Deno Fresh PWA
Some people have reached out and asked me to do a talk on Deno Fresh and Progressive Web Apps (PWA) and I thought this would be a great topic to create a presentation for.
Video
Presentation (PDF)
Get it on Github
What is a PWA?
Progressive Web Apps (PWAs) are web apps that use service workers, manifests, and other web-platform features in combination with progressive enhancement to give users an experience similarly found with native apps.
Is this for Mobile Only?
No. PWAs are built to take advantage of native mobile device features, without requiring the end user to visit an app store, make a purchase and download software locally.
PWA Features & Capabilities
- Connectivity independence - low bandwidth
- App-like interface - mimic navigation of native
- Push notifications - user engagement
- Self-updates - stay fresh :)
- Safety / HTTPS only - Transport Layer Security (TLS)
- Discoverability and easy installation
- Works offline
Prerequisites
- Install Deno CLI
- Create a new Deno Fresh App
Install Deno CLI
curl -fsSL https://deno.land/x/install@v0.1.8/install.sh | sh
Create new app
Deno Fresh App
deno run -A -r https://fresh.deno.dev deno-fresh-pwa
cd deno-fresh-pwa
deno task start
Add <Head />
Open VSCode or another IDE and head over to the index.tsx and import the
<Head /> component from Deno Fresh like so
import { Head } from "https://deno.land/x/fresh@1.1.6/runtime.ts";
Add Manifest Link
Inside the same file index.tsx, add a reference to the manifest.webmanifest
file.
<link
crossorigin="use-credentials"
rel="manifest"
href="/manifest.webmanifest"
/>
Add PWA Script
Inside the same file index.tsx, add the following PWA script.
<script type="module">
import
"https://cdn.jsdelivr.net/npm/@pwabuilder/pwaupdate/dist/pwa-update.js"; const
el = document.createElement("pwa-update"); document.body.appendChild(el);
</script>
Add manifest file
Inside your /static directory, create a new file called manifest.manifest or
manifest.json. Then add the following code snippet to it.
{
"name": "",
"short_name": "",
"theme_color": "#000000",
"background_color": "#000000",
"display": "fullscreen",
"scope": "/",
"start_url": "/",
"orientation": "any",
"icons": [
{
"src": "/icon-512x512.png",
"sizes": "512x512",
"type": "image/png"
},
{
"src": "/manifest-icon-512.maskable.png",
"sizes": "512x512",
"type": "image/png",
"purpose": "maskable"
}
]
}
Add Service Worker file
Inside your /static directory, create a new file called pwa-sw.js. Then add
the following code snippet to it.
https://gist.github.com/erictherobot/4cef30ba1edc184c88e454bf2dc71507
Add Register Service Worker file
Inside your /static directory, create a new file called pwa-sw-register.ts.
Then add the following code snippet to it.
https://gist.github.com/erictherobot/5778631a1fcc72d45d5c18f5359a0809
Add Assets
Inside your /static directory, create a set of new image / icon files.
favicon.ico
icon-192x192.png
icon-256x256.png
icon-384x384.png
icon-512x512.png
manifest-icon-192.maskable.png
manifest-icon-512.maskable.png
You can use an online tool like https://realfavicongenerator.net which will give you all the assets needed from uploading a single image.
That's it!
You've created a Progressive Web App using Deno Fresh!
Your users will thank you and now you can ask your boss for a raise...
Resources
- Icon Generator:
realfavicongenerator.net
- PWA Builder & PWA Tester:
pwabuilder.com
Thanks for reading. Happy coding!
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