React in a worker, worker, worker...

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@stefanjudis React in a worker, worker, worker, worker...

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@stefanjudis www.stefanjudis.com Heyo, I'm Stefan!

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Let's talk about CRA (create-react-app)

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A classical Single Page App

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There are problems with typical single page apps...

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React App No JavaScriptzzzz ...

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React App No JavaScriptzzzz ...

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React App No JavaScriptzzzz ...

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React App No JavaScriptzzzz ...

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React App No JavaScriptzzzz ...

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React App No JavaScriptzzzz ...

No JavaScript zzzz ...

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13 Million requests for JavaScript will time out. Ian Feather (Buzzfeed)

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"We don't have any non- JavaScript users". No, all your users are non-JS while they're downloading your JS. Jake Archibald (Google)

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React App No JavaScriptzzzz ...

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React App No JavaScriptzzzz ...

The spinner of death

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How can we do better?

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proxx.app

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nextjs.org www.gatsbyjs.org

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nextjs.org www.gatsbyjs.org Run the same React code on the server and client

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bundle.js

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bundle.js

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bundle.js Interactive

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Better performance!

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Better performance! Faster indexed by Google!

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Better performance! Faster indexed by Google! It's the same code front to back!

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But is it really the same code?

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module.exports = global.fetch = global.fetch || (typeof process == 'undefined' ? require('unfetch').default || require('unfetch') : function(url, opts) { return require('node-fetch')(url.replace(/^\/\ //g, 'https: //'), opts); });

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github.com/developit/unfetch/tree/master/packages/isomorphic-unfetch

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What if we serve HTML from an environment with the same methods?

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The Service Worker worker.js

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if ('serviceWorker' in navigator) { navigator.serviceWorker .register('/worker.js') .then(function(registration) {}, function(err) {}); }

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self.addEventListener('fetch', function(event) { event.respondWith( caches.match(event.request) .then(function(response) { // Cache hit - return response if (response) { return response; } return fetch(event.request); } ) ); });

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Let's try an experiment?

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Crowd Coding...

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What did just happen?

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No content

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localhost:8080

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localhost:8080

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localhost:8080 worker.js

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localhost:8080 worker.js

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localhost:8080 worker.js Interactive

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localhost:8080 worker.js Interactive

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localhost:8080 worker.js Interactive

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localhost:8080 worker.js Interactive

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localhost:8080 worker.js Interactive

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localhost:8080 worker.js Interactive

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worker.js

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worker.js

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worker.js

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worker.js

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Could universal workers be a thing?

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Let's create a cloud worker!

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www.cloudflare.com/products/cloudflare-workers/

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developers.cloudflare.com/workers/reference/

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developers.cloudflare.com/workers/reference/

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developers.cloudflare.com/workers/reference/

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https://dash.cloudflare.com/9dcd7c...

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worker.js

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worker.js

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worker.js

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worker.js

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worker.js

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worker.js

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worker.js

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worker.js

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worker.js worker.js

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worker.js worker.js

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worker.js worker.js

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worker.js

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worker.js

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worker.js

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worker.js

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worker.js

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Is this the solution to universal JavaScript?

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Service worker development is still very tedious

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Cache handling is tough

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It's worth investigating!

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Servers with browser APIs will change how we share code!

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react-in-a-worker.netlify.com

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www.react-in-a-worker.rocks

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github.com/stefanjudis/react-in-a-worker

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One last thing...

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... let's serve HTML instead of spinners.

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@stefanjudis [email protected] www.stefanjudis.com Thanks.