This document discusses the author's experience using Angular 2 in production for one year. It covers what they expected from the framework, including high performance, compatibility with old browsers, and a long product lifecycle. It also discusses key Angular 2 concepts like Web Components, TypeScript, bindings, reactive programming with RxJS, debugging tools, and forms. The author concludes by discussing future directions like Angular Universal for server-side rendering and using Angular with other technologies like NativeScript.

2. ONE YEAR OF ANGULAR 2
ON PRODUCTION
Oleksandr Tryshchenko
Senior Front-end Developer, Dataart

3. 29 April 2017
Agenda
• Why?
• How?
• Problems
• How to solve problems
• Examples
• Q&A

5. What we expected from technology
• It doesn’t force you to write infrastructure code
• Stable framework with active community
• Simple team complectation
• Consistent ecosystem and similar architecture for all projects
• High level of abstraction and real boost for developent
• Low coupling
• Testability.
29 April 2017 5

6. What we wanted from technology
• High performance.
• Compatibility with old browsers.
• Long product lifecycle.
29 April 2017 6

7. 29 April 2017
Web Components
• Shadow DOM
• Templates
• Imports
• Custom Elements

8. 29 April 2017
Web Components
• Shadow DOM
• Templates
• Imports
• Custom Elements

9. 29 April 2017
Shadow DOM

10. Shadow DOM
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11. Shadow DOM
29 April 2017 11

12. Shadow DOM – Emulated
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13. Shadow DOM – Emulated
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14. Shadow DOM – Emulated
barny-bear
- - barny-bear.component.ts
- - barny-bear.component.spec.ts
- - barny-bear.component.scss
- - barny-bear.component.html
- - barny-bear.module.ts
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15. Shadow DOM – Pseudoselectors
:host
/deep/
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16. viewEncapsulation
• None – don’t use Shadow DOM.
• Emulated – emulate Shadow DOM behavior (Default).
• Native – turn on the native implementation.
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17. Component Declaration
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19. 29 April 2017
Angular CLI
• Official tool.
• Standardization and totalitarism.
• Achieves time on routine.
• Configures Webpack instead of you .
• Expect unit tests from developer.

20. 29 April 2017
Angular CLI – possibilities
It can:
• Scaffold an empty project
• Generate components, services, pipess
• Generate infrastructure: tests, builds
• Syntax code analysis
• Development environment
• Code formatting

21. Angular CLI ?
29 April 2017 21

22. 29 April 2017
Angular CLI - Webpack

23. 29 April 2017
Anders Hejlsberg
Was working on:
• Turbo Pascal
• Delphi
• C#
• TypeScript

24. 29 April 2017
TypeScript
• Very flexible transpiler
• Types control
• Interfaces
• Mixins
• Namespaces

25. TS Type handling
• Interfaces
• Check function types and arguments
• Check types of object properties
• Check function return values
• Possibility to declare your own types
• Enum
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26. private models = new Observable<Correlation[]>();
29 April 2017 F O O T E R H E R E 26

27. TS Decorators
(ESXXXX Decorators)
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import { Component, Input, Output, EventEmitter } from
'@angular/core';
@Component({
selector: 'conditional-formating',
templateUrl: './conditional-formating.component.html',
styleUrls: ['./conditional-formating.component.scss'],
providers: []
})
export class ConditionalFormatingComponent {
@Input() value: Number = 0;
@Input() label: String = ‘No Value';
constructor() { }
}

28. Decorators
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29. Decorators
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30. Decorators
29 April 2017 H T T P S : / / G I T H U B . C O M / W Y C A T S / J A V A S C R I P T - D E C O R A T O R S 30

31. TS typing
xxxx.d.ts
declare namespace d3 {
type TooltipDirection = ("n" | "s" | "e" | "w" | "nw" | "ne" | "sw" | "se");
interface Tooltip {
hide(): Tooltip;
show(target: SVGElement): Tooltip;
attr(name: string, value: Primitive): Tooltip;
style(name: string, value: Primitive, priority?: string): Tooltip;
destroy(): Tooltip;
}
export function tip(): Tooltip;
}
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32. 29 April 2017
Binding
One-direction «inside»:
• {{expression}}
• [target] = "expression"
• bind-target = "expression"

33. 29 April 2017
Binding
One-direction «внаружу»:
• (target) = "statement"
• on-target = "statement"

34. 29 April 2017
Binding
Two-way
• [(target)] = "expression"
• bindon-target = "expression"

35. Key Value Differs
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36. 29 April 2017
ReactiveX (Rx.js)
• Another way to organize async actions
• Cause the new way of component
composition

37. Using flatMap and switchMap
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38. Rx.js + A2
PROS
- Allows us to remove http logic from components
- Can be used with an async pipe
CONS
- Require composition changes
- Implements toPromise() method
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39. Composition of components
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40. Rx.js
29 April 2017 H T T P S : / / W W W . Y O U T U B E . C O M / W A T C H ? V = W W R 9 N X V X 1 E C 40
ROB WORMALD
(@ROBWORMALD):
ANGULAR & RXJS AT
NG-EUROPE 2016

41. Zone.js
• Cool errors trace.
• Dirty-checking.
• You can stop all the async actions after component
destruction
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42. Web Animations API
29 April 2017 H T T P S : / / W W W . Y O U T U B E . C O M / W A T C H ? V = 4 V D M I V R M L 3 4 42
ANGULAR 2 0
ANIMATIONS MATIAS
NIEMELA
ANGULARCONNECT

43. Angular 2 Forms
29 April 2017 H T T P S : / / W W W . Y O U T U B E . C O M / W A T C H ? V = X Y V 9 L S R V 0 S 4 43
ANGULAR 2 FORMS
KARA ERICKSON

44. Compatibility
• App particulary compiles into ES5.
• CLI generates polyfills.brower.ts.
• Won’t work on Safari and IE .
• We need to include intl polyfill.
29 April 2017 44

45. Debugging of Angular 2
applications
29 April 2017 45

46. @angular/core/testing
- Jasmine
- Karma
- Protractor (e2e)
29 April 2017 46

47. 29 April 2017
Augury
• Official tool from A2 team.
• Don’t need any efforts from developer.
• Works well with an built app.

48. 29 April 2017 48

49. 29 April 2017
Visual Studio Code
• Syntax analysis and smart suggestions
based on types and interfaces
• Built-in transpiler

50. Personal
• Components. Only one type of components.
• Directives. Only one type of directives.
• Services. Only one type of services.
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51. Thanks!
29 April 2017 51

52. What’s after?
29 April 2017 52

53. 29 April 2017
Angular 2 Universal
• Official tool.
• Renders static pages on server side.
• Pre-render and re-render.
• Cool API reference.

54. 29 April 2017
NativeScript

55. 29 April 2017
angular

56. 29 April 2017
angular-react

57. 29 April 2017
angular-react-native

58. 29 April 2017
angular-react-native-
renderer