EmberConf 2019 Keynote

The opening keynote from EmberConf 2019, hosted in Portland, OR. Presented by Tom Dale and Yehuda Katz.

2. Code of Conduct
4. A framework for creating ambitious web applications.
5. Climb the Mountain Together
6. Climb the Mountain Together
7. The Celery Test
8. • Ember CLI • Six-Week Release Cycle • RFC Process • Code Mods • Templates • Engage with Standards • Invest in Community • Addons What We Did
9. • <script> tag • Web Components • Framework reboot • Ember Native What We Didn’t Do
10. Progress Stability
11. Aggressive Changes Cautious Changes Aggressive Changes
12. Falling Behind Community Fragmenting Aggressive Changes Cautious Changes Aggressive Changes
13. Falling Behind Community Fragmenting Em ber 1.13 Improvements • New rendering engine • Eliminate metamorph tags • Closure actions • Helper API • hasBlock Deprecations • Ember.View • {{view}} helper • Ember.Select • itemController • bind-attr
14. Falling Behind Community Fragmenting Em ber 1.13 Em ber 2.0
15. Falling Behind Community Fragmenting Em ber 2.0
16. Ember 3.0
17. Co
18. Co
19. this.get('firstName') this.set('lastName') this.firstName this.set('firstName') Co
20. {{user-avatar user=this.currentUser}} <UserAvatar @user={{this.currentUser}} /> Co
21. {{input value="hello"}} <Input @value="hello" /> Co
22. Pit of Incoherence Incremental Change Where We Are Where We Want to Be
23. Pit of Incoherence Incremental Change Where We Are Where We Want to Be
24. Where We Are Where We Want to Be
25. Where We Are Where We Want to Be
26. Ready for Everyone Where We Are Where We Want to Be
28. OCTANE
29. OCTANE
30. • No jQuery Required • JavaScript Classes • Angle Bracket Invocation • Glimmer Components • Tracked Properties Ember Octane A better component system
31. • Off by default for new apps • Documentation, tests, addons updated to not need jQuery No jQuery Required
32. No jQuery Required
33. • Standard JavaScript syntax • Knowledge portability • Integration with IDEs, linters • Works well with TypeScript JavaScript Classes
34. Classic Class import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Source: Ember Observer
35. JavaScript Class import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } }
36. import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } } import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Classic Class JavaScript Class
37. import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } } import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Classic Class JavaScript Class
38. import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } } import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Classic Class JavaScript Class
39. import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } } import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Classic Class JavaScript Class
40. import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Classic Class JavaScript Class import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } }
41. import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } } import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Classic Class JavaScript Class
42. import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default class extends AjaxService { @service session; namespace = '/api/v2'; @computed('session.{isAuthenticated,header}') get headers() { if (this.session.isAuthenticated) { return this.session.header; } } } import { computed } from '@ember/object'; import { inject as service } from '@ember/service'; import AjaxService from 'ember-ajax/services/ajax'; export default AjaxService.extend({ session: service(), namespace: '/api/v2', headers: computed('session.{isAuthenticated,header}', function() { if (this.get('session.isAuthenticated')) { return this.get('session.header'); } }) }); Classic Class JavaScript Class
43. Angle Bracket Invocation {{weather-tracker zip="10001"}} <WeatherTracker @zip="10001" />
44. Angle Bracket Invocation <WeatherTracker @zip="10001" aria-label="Weather" />
45. • Easier to scan visually • One-word components • <User /> • HTML attributes Angle Bracket Invocation
46. • Minimal base class • “Outer HTML” templates • Explicit, immutable arguments Glimmer Components
47. Classic Component import Component from "@ember/component"; export default Component.extend({ tagName: 'button', elementId: 'my-button', classNames: ['btn'], classNameBindings: ['isDangerous:dangerous'], attributeBindings: ['isDisabled:disabled'], isDangerous: false, isDisabled: false, }); my-button.js my-button.hbs Click Me
48. <button id="my-button" class="btn {{if @isDangerous 'dangerous'}}" disabled={{@isDisabled}}> Click Me </button> my-button.js my-button.hbs Click Me import Component from "@ember/component"; export default Component.extend({ tagName: 'button', elementId: 'my-button', classNames: ['btn'], classNameBindings: ['isDangerous:dangerous'], attributeBindings: ['isDisabled:disabled'], isDangerous: false, isDisabled: false, }); Glimmer Component my-button.hbs Classic Component
49. • State of the art change tracking • Fast, efficient updates • “Just JavaScript” • No need for this.set() Tracked Properties
50. Tracked Properties import Component from "@glimmer/component"; import { tracked } from "@glimmer/tracking"; import { action } from "@ember/object"; export default class extends Component { @tracked count = 0; @action increment() { this.count++; } }
51. Computed Tracked Properties import Component from "@glimmer/component"; import { tracked } from "@glimmer/tracking"; export default class extends Component { @tracked firstName = "Godfrey"; @tracked lastName = "Chan"; get fullName() { return `${this.firstName} ${this.lastName}`; } }
52. Tracked Properties, Anywhere import { tracked } from "@glimmer/tracking"; export default class Person { @tracked firstName; @tracked lastName; @tracked birthYear; constructor(firstName, lastName, birthYear) { this.firstName = firstName; this.lastName = lastName; this.birthYear = birthYear; } get age() { return (new Date()).getFullYear() - this.birthYear; } randomizeAge() { this.birthYear = 1900 + Math.round(Math.random() * 100); } }
53. person = new Person("Godfrey", "Chan", 1988); 1. Create a new model instance 2. Pass it to a component <UserEditor @person={{this.person}} /> 3. Mutate the model from the component @action randomize() { this.args.person.randomizeAge(); }
56. One Simple Rule If you change a class field and want the DOM to update, make it tracked.
57. • No jQuery Required • JavaScript Classes • Glimmer Components • Tracked Properties
59. <div class="weather"> <h2>Current weather</h2> <address> New York, NY </address> <div class="temperature"> 55° </div> </div> <WeatherTracker /> weather-tracker.hbs
60. import Component from '@glimmer/component'; import { tracked } from '@glimmer/tracking'; export default class extends Component { @tracked temperature = 55; @tracked city = "New York, NY"; } <div class="weather"> <h2>Current weather</h2> <address> {{this.city}} </address> <div class="temperature"> {{this.temperature}}° </div> </div> <WeatherTracker /> weather-tracker.hbs weather-tracker.js
61. import Component from '@glimmer/component'; import { tracked } from '@glimmer/tracking'; export default class extends Component { @tracked temperature; @tracked city; async loadWeather() { const response = await fetch(`/api?zip=${this.args.zip}`); const { temperature, city } = await response.json(); this.temperature = temperature; this.city = city; } } <div class="weather"> <h2>Current weather</h2> <address> {{this.city}} </address> <div class="temperature"> {{this.temperature}}° </div> </div> <WeatherTracker @zip="10001" /> weather-tracker.hbs weather-tracker.js
62. import Component from '@glimmer/component'; import { tracked } from '@glimmer/tracking'; export default class extends Component { @tracked temperature; @tracked city; async loadWeather() { const response = await fetch(`/api?zip=10001`); const { temperature, city } = await response.json(); this.temperature = temperature; this.city = city; } } <div class="weather"> <h2>Current weather</h2> <address> {{this.city}} </address> <div class="temperature"> {{this.temperature}}° </div> </div> <WeatherTracker /> weather-tracker.hbs weather-tracker.js
63. <div class="weather"> <h2>Current weather</h2> <address> {{this.city}} </address> <div class="temperature"> {{this.temperature}}° </div> </div> <WeatherTracker @zip="10001" /> import Component from '@glimmer/component'; import { tracked } from '@glimmer/tracking'; export default class extends Component { @tracked temperature; @tracked city; async loadWeather() { const response = await fetch(`/api?zip=10001`); const { temperature, city } = await response.json(); this.temperature = temperature; this.city = city; } } weather-tracker.hbs weather-tracker.js
64. import Component from '@glimmer/component'; import { tracked } from '@glimmer/tracking'; export default class extends Component { @tracked temperature; @tracked city; async loadWeather() { const response = await fetch(`/api?zip=${this.args.zip}`); const { temperature, city } = await response.json(); this.temperature = temperature; this.city = city; } } <div class="weather"> <h2>Current weather</h2> <address> {{this.city}} </address> <div class="temperature"> {{this.temperature}}° </div> </div> <WeatherTracker @zip="10001" /> weather-tracker.hbs weather-tracker.js
65. import Component from '@glimmer/component'; import { tracked } from '@glimmer/tracking'; export default class extends Component { @tracked temperature; @tracked city; constructor() { super(...arguments); this.loadWeather(); } async loadWeather() { const response = await fetch(`/api?zip=${this.args.zip}`); const { temperature, city } = await response.json(); this.temperature = temperature; this.city = city; } } <div class="weather"> <h2>Current weather</h2> <address> {{this.city}} </address> <div class="temperature"> {{this.temperature}}° </div> </div> <WeatherTracker @zip="10001" /> weather-tracker.hbs weather-tracker.js
66. <div class="weather"> <h2>Current weather</h2> <address> New York, NY </address> <div class="temperature"> 55° </div> </div> HTML <div class="weather"> <h2>Current weather</h2> <address> {{this.city}} </address> <div class="temperature"> {{this.temperature}}° </div> </div> Template DOM Output
68. FUN
69. P R E V I E W Today
70. • Features available in stable, beta or canary • Try it out and give feedback • Review guides, update addons, etc. P R E V I E W emberjs.com/editions/octane
72. Classic Octane ?
73. Pipeline • New file layout • Template imports • Embroider
74. Embroider • Faster builds • Asset optimization • Built on JavaScript modules
75. HBS ES5 CSS Source Files “Lingua Franca” HBS SCSS • TypeScript, Flow, experimental JS… • Sass, Less, CSS Blocks… • Handlebars, Emblem… • Latest ECMAScript (e.g. ES2018) • CSS • Handlebars
76. HBS ES5 CSS Packager • Optimize and compile for the browser APP.JS APP.CSS
79. HBS ES5 CSS Packager • Optimize and compile for the browser APP.JS APP.CSS webpack Rollup
80. 2019 Roadmap
81. Climb the Mountain Together
83. Jen Weber Framework Chris Garrett Framework Robert Jackson Data Chris Thoburn Data Chris Manson Learning Amy Lam Learning Kenneth Larsen Learning Martin Muñoz Alumni Brendan McLoughlin Alumni Clemens Müller Alumni
84. 2018 Template-only components Brand guidelines Discord Optional jQuery JS classes in Ember Data Internal survey Broccoli 2 New Ember CLI docs Ember Times 51x Element modifiers emberjs.com is an Ember app Decorators ember-template-lint Tracked properties Documentary RecordData ember-auto-import Testing improvements <AngleBrackets /> Async leak detection New guides TOC Editions JS classes Rehydration Async testing Reader questions Public infra redux Babel parallel compilation Roadmap RFC
85. Thank you!