Modern Ember - Speaker Deck

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modern ember dan gebhardt @dgeb ember israel meetup 2018.08.27

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WHY EMBER?

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WHY EMBER IN 2018?

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OUR VALUES • Convention over Conﬁguration • Stability without Stagnation • Climb the Mountain Together

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modern ember • Fewer Concepts • Latest JavaScript • Optimize for Success

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All features shown today are available in stable, beta, or canary releases. Some are behind a feature ﬂag and subject to change. modern ember * *

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STANDARD FILE LAYOUT

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src/ ui/ components/ action-bar/ component.js template.hbs user-proﬁle/ component.js template.hbs

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src/ ui/ components/ action-bar/ component.js template.hbs action-bar-item/ component.js template.hbs user-proﬁle/ component.js template.hbs

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JS MODULES

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import Component from '@ember/component'; import { computed } from '@ember/object'; export default class extends Component { fullName: computed(/* … */) }

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UNLOCKED OPTIMIZATIONS • Strip assertions & other debug functions • Treeshaking

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JS CLASSES

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class Person { constructor(firstName, lastName) { this.firstName = firstName; this.lastName = lastName; } sayHello() { console.log(`${this.firstName} ${this.lastName}`); } }

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DECORATORS

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export default class extends Component { @service currentUser; constructor(...args) { super(...args); this.set('title', 'Default Title'); console.log('constructing!'); } didInsertElement() { tab(this.element); } @computed get tabCount() { return this.tabs.length; } }

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CLASS FIELDS

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export default class extends Component { @service currentUser; constructor(...args) { super(...args); this.set('title', 'Default Title'); console.log('constructing!'); } update(title) { this.set('title', title); } didInsertElement() { tab(this.element); } @computed get tabCount() { return this.tabs.length; } }

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export default class extends Component { @service currentUser; title = 'Default Title'; update(title) { this.set('title', title); } didInsertElement() { tab(this.element); } @computed get tabCount() { return this.tabs.length; } }

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TYPESCRIPT export default class extends Component { @service currentUser: User; title = 'Default Title'; tabs: Tab[]; constructor(...args) { super(...args); console.log('constructing!'); } didInsertElement() { tab(this.element); } @computed get tabCount() { return this.tabs.length; } }

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TESTING

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TESTS • Unit • Integration • Acceptance

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import { module, test } from 'qunit'; import { setupTest } from 'ember-qunit'; module('Unit | Service | location', function(hooks) { setupTest(hooks); // Replace this with your real tests. test('it exists', function(assert) { let service = this.owner.lookup('service:location'); assert.ok(service); }); }); EXAMPLE UNIT TEST BLUEPRINT

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import { module, test } from 'qunit'; import { setupApplicationTest } from 'ember-qunit'; import { visit, fillIn, click } from '@ember/test-helpers'; module('Acceptance | posts', function(hooks) { setupApplicationTest(hooks); test('should add new post', async function(assert) { await visit('/posts/new'); await fillIn('input.title', 'My new post'); await click('button.submit'); const title = this.element.querySelector('ul.posts li:first').textContent; assert.equal(title, 'My new post'); }); }); EXAMPLE ACCEPTANCE TEST

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DEPENDENCIES

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EMBER ADDONS

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NPM PACKAGES

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Step 1. $ npm install --save axios Step 2. import axios from 'axios'; Step 3. There is no step 3.

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OPTIONAL JQUERY

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import Component from '@ember/component'; export default Component.extend({ didInsertElement() { let iframe = this.element.querySelector('iframe'); let message = { name: 'didInsertElement' }; iframe.contentWindow.postMessage(message, '*'); } });

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Preact Glimmer

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METRICS • First Meaningful Paint • Rehydration Time

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2.5s 2.9s First Meaningful Paint Glimmer Preact 90th percentile, lower numbers are better

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2.5s 4.1s 2.9s 4.3s Rehydration First Meaningful Paint Glimmer Preact 90th percentile, lower numbers are better

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• Binary Bytecode • Server-side Rendering • Repairing Rehydration • Async Rendering

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HBS HBS HBS 110110 010010 101011 001010 GBX compiles

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ASYNC RENDERING

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SERVER SIDE RENDERING

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Glimmer 2.5s 4.1s Glimmer (no SSR) 4.0s 4.0s First Meaningful Paint Fully Interactive 90th percentile, lower numbers are better

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TRACKED FIELDS

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export default class extends Component { @service currentUser; @tracked title = 'Default Title'; update(title) { this.title = title; } didInsertElement() { tab(this.element); } @computed get tabCount() { return this.tabs.length; } }

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export default class extends Component { @service currentUser; @tracked title = 'Default Title'; update(title) { this.title = title; } didInsertElement() { tab(this.element); } @tracked get tabCount() { return this.tabs.length; } } // TBD: tracked vs. computed

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{{user-profile}} ANGLE BRACKET COMPONENTS

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{{#each options as |option|}} {{radio-button action="select" option=option selected=selected}} {{/each}} {{#each options as |option|}} {{/each}}

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{{#each options as |option|}} {{radio-button action="select" option=option selected=selected}} {{/each}} {{#each options as |option|}} {{/each}}

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You have unsaved changes. Do you want to leave? {{#if @isOpen}}

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You have unsaved changes. Do you want to leave? {{#if @isOpen}}

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PERFORMANCE

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Stack Registers Executable Heap Opcodes Constants References Validators Component Managers DOM VM

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Stack Registers Executable Heap Opcodes Constants References Validators Component Managers DOM VM

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❤ COMMUNITY

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RESOURCES

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https://www.youtube.com/watch?v=NhtpXs0ZtUc

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https://glimmerjs.com

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https://codingitwrong.com/2018/08/16/modern-ember.html

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https://github.com/emberjs/rfcs/pull/364

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Thanks! dan gebhardt @dgeb ember israel meetup 2018.08.27