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The Evolution of Airbnb's Frontend

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Over the last few years, Airbnb’s frontend architecture has evolved to keep pace with the rapid advancement happening the JavaScript world. Starting as a humble Rails 2 + Prototype.js app in 2008, the frontend stack powering airbnb.com has gone through a few revisions, including a push towards single-page app architecture with Backbone.js and Handlebars.js, an adventure into isomorphic JavaScript with Rendr (our library for using Node.js to server-render Backbone SPAs), and most recently, a move toward React.js and a re-envisioning of our build pipeline to take advantage of CommonJS, ES6, and a Node.js-based transform system. Spike Brehm, software engineer on the @AirbnbNerds team, will walk through how we approached and executed on these changes. Plus, get excited to see a preview of our new approach to isomorphic JavaScript, allowing us to server-render React components from our Rails app.

Spike Brehm is a software engineer at Airbnb who specializes in building rich web experiences. As a JavaScript nerd, he has spent the last few years shipping web apps and prototyping Airbnb’s front-end stack, experimenting with “isomorphic JavaScript” — apps that have the flexibility to run on both the client and sever using the same codebase.

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The Evolution of Airbnb's Frontend

  1. The Evolution of Airbnb’s Frontend ! @spikebrehm
  2. Spike Brehm ____________________________ @spikebrehm ! @AirbnbNerds since 2011
  3. 1. A Brief History of airbnb.com 2. Modernizing our JavaScript Stack 3. Airbnb&Isomorphic JavaScript
  4. A Brief History of airbnb.com
  5. ! airbedandbreakfast.com2008
  6. ! airbnb.com2009
  7. ! airbnb.com2012
  8. ! airbnb.com2015
  9. Rails 2.x MySQL Vanilla CSS Prototype.js !2009
  10. Rails 3.x, Java MySQL, Redis, HDFS, Postgres, DynamoDB SASS, O2 jQuery, Backbone, Handlebars !2012
  11. ! Bootstrap-inspired CSS frameworkO2
  12. Rails 3.x, Java, Node.js MySQL, Redis, HDFS, Postgres, DynamoDB, Kafka, RabbitMQ, … SASS, O2 jQuery, Backbone, Handlebars, React, CommonJS, ES6 !2015
  13. Modernizing our JavaScript Stack
  14. A. JavaScript Libraries
  15. Flight
  16. ! Listing management tools
  17. Hitting a Wall with Backbone&Handlebars Backbone & Handlebars approach falls apart as UI components become more dynamic. No data binding, so have to either: 1. Re-render whole view when model changes (slow, lose DOM state like focused fields). 2. Drop down to manual DOM manipulation.
  18. Airbnb <3 React React makes it easier to build&maintain stateful UI components. React makes it easier to reason about data flow in your app.
  19. B. Asset building
  20. Sprockets Rails asset pipeline: manages JavaScripts, stylesheets, images, etc. Written by Ruby devs to solve problems of simple web apps.
  21. JavaScript </3 Sprockets Doesn’t solve JavaScript dependency management: 1. Local dependencies (application code) 2. External dependencies (third-part libraries)
  22. /* application.js */ //= require_tree . /* application.js */ ! //= require ./models/listing.js //= require ./collections/listings.js //= require_tree . What if one file depends on another? Bad: Order matters Bad: Objects attached to `window` Bad: Implicit dependencies Local dependencies
  23. $ cp ~/Downloads/backbone.js app/assets/javascripts/vendor/ backbone-1.1.12.js /* application.js */ ! //= require vendor/backbone-1.1.12.js ... //= require_tree . What if I want to use Backbone? Bad: Manually download Bad: Manually versioning Bad: Implicit dependencies External dependencies
  24. CommonJS&NPM to the rescue
  25. /* collections/listings.js */ var Listing = require(‘../models/listing’); ! module.exports = ... Good: Explicit dependencies Good: Don’t worry about ordering Good: Objects not leaked to `window` Local dependencies
  26. /* collections/listings.js */ var Listing = require(‘../models/listing’); var Backbone = require(‘backbone’); ! module.exports = Backbone.Collection.extend({ ... }); Good: Central management Good: Explicit dependencies External dependencies $ npm install --save backbone@1.1.2
  27. Explicit Dependencies
  28. Browserify* Use CommonJS syntax in client-side modules: `require` and `module.exports`. Package dependencies from NPM. Transforms. * or Webpack
  29. Browserify Transforms Handlebars var template = require(‘./templates/user.hbs’); ! var html = template({name: “Spike”}); es2015 import Header from ‘./Header.jsx’; ! const numMonths = 36; ! let photos = users.map((user) => user.photo);
  30. Airbnb&Isomorphic JavaScript
  31. JavaScript code that can be shared between environments.
  32. +
  33. Client-side MVC Client Server Your app API
  34. +
  35. Client + server MVC Server Client Your app API
  36. Performance Initial pageload speed. SEO* Crawlable single-page apps. Flexibility Run code anywhere. Maintainability Reduce code duplication.
  37. Performance
  38. Client-rendered app Download skeleton HTML User sees content Download JavaScript Fetch data from API Evaluate JavaScript Exacerbated on mobile: high latency, low bandwidth
  39. Server-rendered app Download full HTML Download JavaScript User sees content Evaluate JavaScript
  40. Rendr
  41. Moving Away from Rendr at Airbnb
  42. It was revolutionary to share code between client and server using Node.js…
  43. 10% 90% Rails Node.js …but too hard to share code between server and server— between Rails and Node.js. Long tail of features to rewrite in JavaScript: 1. CSRF tokens 2. Custom headers, i.e. CDN 3. Middleware 4. Application code
  44. Do we rewrite everything in Node.js?
  45. The single worst strategic mistake that any software company can make: ! Rewrite the code from scratch. Joel Spolsky
  46. A New Approach to Isomorphic JavaScript at Airbnb
  47. Browser. Rails. App.jsx Fetch JSON data Node.js.App.jsx
  48. Mystique: Node.js rendering service for React components Allows us to render React components on the server from within Rails. Built on Iso, tiny utility for isomorphic bootstrapping of React components. https://github.com/goatslacker/iso
  49. ! https://www.airbnb.com/getaways/san-francisco A/B testing now
  50. Thanks!! ! @spikebrehm @AirbnbNerds

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