view-source:https://twitter.com

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view-source:https://twitter.com A very brief overview of twitter.com’s frontend architecture

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@giuseppegurgone 2009

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2010 @giuseppegurgone

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2010 @giuseppegurgone

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@giuseppegurgone 2010 #!NewTwitter Fully Client Side Application jQuery, Mustache, LABjs, Modernizr Home grown MVC “Necessary complexity” – Dan Webb

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2012 @giuseppegurgone

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@giuseppegurgone 2012 Expandable tweets

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@giuseppegurgone 2012 Inline Previews – Previeweet

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Journey into twitter.com’s source code @giuseppegurgone Previeweet https://github.com/giuseppeg/Previeweet Reverse engineering Minified code Learnt a ton !0 ~ ,

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@giuseppegurgone Previeweet last iteration pre–cards

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@giuseppegurgone @danwrong yey! The future is coming and it looks just like the past, but more good underneath. — Tom Lea (@cwninja) May 23, 2012 Server side rendering – 4x faster Progressive Enhancement Flight.js – Component based UI framework CommonJS + AMD via Loadrunner hashbang #! Hello PushState

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@giuseppegurgone Architecture Flight.js – Twitter’s JS Framework Code splitting (bundles) App initialization (bootstrapping) Routing

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function inbox() { this.attributes({ myProp: 'hi' }) this.doSomething = function () { this.trigger(document, 'uiDoingSomething') /* ... */ } // after initializing the component this.after('initialize', function () { this.on('click', this.doSomething) }) } var Inbox = flight.component(inbox) /* Attach the component to a DOM node */ Inbox.attachTo('#inbox', { myProp: 'hello' }) Flight.js A component-based, event-driven JavaScript framework @giuseppegurgone

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Flight.js Components @giuseppegurgone Get a reference to a node this.$node Organised in UI and Data components Decoupled – trigger and subscribe to DOM events Isolated and easy to test and reason about

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@giuseppegurgone Flight.js Components

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Code Splitting Bundles @giuseppegurgone

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var UiTimeline = require('components/ui/Timeline') var DataTimeline = require('components/data/Timeline') /* ... */ function init(initData) { /* Attach components to DOM nodes */ UiTimeline.attachTo('#timeline', initData.timeline) DataTimeline.attachTo('#timeline', initData.timeline) /* ... */ } module.exports = init Code Splitting Bundles @giuseppegurgone

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App Initialization Bootstrapping @giuseppegurgone

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/* Grab initial data */ var initData = {} try { initData = $.parseJSON( $('#init-data').val() ) } catch (e) {} /* Grab modules base path */ var basePath = using.path = $('#swift-module-path').val() /* Grab modules names */ var modules = $('.swift-boot-module').map(function (_, module) { return module.val() }).toArray() /* require modules and call their exported function (init) with initData */ using(modules, function () { [].slice.call(arguments).forEach(function (init) { init(initData) }) }) App Initialization Bootstrapping @giuseppegurgone

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App Initialization until a few days ago... @giuseppegurgone

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PushState via HTML5 History API Progressive Enhacement UI component to catch clicks on .js-nav links Data component to fetch data and update the URL / History UI component to update the UI Routing @giuseppegurgone