Angular 5 Release: What’s New?

TL;DR: Angular is an all-encompassing JavaScript framework that is frequently used by developers all over the world for building web, desktop, and mobile applications. In this article, I'll cover the new features in Angular 5 and several other changes and deprecations.

Angular is built and maintained by Google.. It is a platform that combines declarative templates, dependency injection, end to end tooling, and integrated best practices to solve development challenges. Web platforms such as Google Adwords, Google Fiber, Adsense, and Winc use Angular to build their user interfaces.

Angular 5 was announced to the world on November 1, 2017. The previous Angular version was 4.4.0. This release focused on making Angular smaller and faster to use. Let's go through the major changes in version 5.

1. Http Deprecated, HttpClient Here to Stay

Before version 4.3, the

@angular/http

Http

HttpClient

@angular/common/http

HttpClient

• Typed, synchronous response body access, including support for JSON body types.
• JSON is an assumed default and no longer needs to be explicitly parsed.
• Interceptors allow middleware logic to be inserted into the pipeline.
• Immutable request/response objects.
• Progress events for both request upload and response download.
• Post-request verification & flush based testing framework.

import { HttpClientModule } from '@angular/common/http';

2. Support for Multiple Export Alias in Angular 5

In Angular 5, you can now give multiple names to your components and directives while exporting. Exporting a component with multiple names can help your users migrate without breaking changes.

“Exporting a component with multiple names can help your users migrate without breaking changes.”

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Example Usage:

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
  exportAs:'dashboard, logBoard'
})
export class AppComponent {
  title = 'app';
}

3. Internationalized Number, Date, and Currency Pipes

Angular 5 ships with new number, date, and currency pipes that increase standardization across browsers and eliminate the need for i18n polyfills. The pipes rely on the CLDR to provide extensive locale support and configurations for any locales you want to support. To use the old pipes, you will have to import the

DeprecatedI18NPipesModule

CommonModule

  import { NgModule } from '@angular/core';
  import { CommonModule, DeprecatedI18NPipesModule } from '@angular/common';

  @NgModule({
    imports: [
      CommonModule,
      // import deprecated module after
      DeprecatedI18NPipesModule
    ]
  })
  export class AppModule { }

4. Improved Decorator Support in Angular 5

Angular 5 now supports expression lowering in decorators for lambdas, and the value of

useValue

useFactory

data

In Angular 5

  Component({
    provider: [{provide: 'token', useFactory: () => null}]
  })
  export class MyClass {}

Before Angular 5

  Component({
    provider: [{provide: 'token', useValue: calculated()}]
  })
  export class MyClass {}

5. Build Optimization

The Angular team focused on making Angular 5 faster, smaller and easier to use. In Angular 5, production builds created with the Angular CLI will now apply the build optimizer by default. The build optimizer removes Angular decorators from your app's runtime codes thereby reducing the size of your bundle and increasing the boot speed of your application. In addition, the build optimizer removes part of your application that is not needed during runtime via tree-shaking. This action leads to a decreased bundle size, and faster application speed.

“In Angular 5, production builds created with the Angular CLI will now apply the build optimizer by default.”

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6. Angular Universal Transfer API

The Angular Universal team has added Domino to the

platform-server

Furthermore, two modules,

ServerTransferStateModule

BrowserTransferModule

7. Faster Compiler in Angular 5

A lot of improvements have been made to the Angular compiler to make it faster. The Angular compiler now leverages TypeScript transforms. You can take advantage of it by running:

ng serve --aot

Angular.io was used as a case study and the compiler pipeline saved 95% of the build time when an incremental AOT build was performed on it.

Note: TypeScript transforms are a new feature introduced as part of TypeScript 2.3, that allows hooking into the standard TypeScript compilation pipeline.

8. Forms Validation in Angular 5

In Angular 5, forms now have the ability to decide when the validity and value of a field or form are updated via on

blur

submit

Example Usage

  <input name="nickName" ngModel [ngModelOptions]="{updateOn: 'blur'}">

Another Example

  <form [ngFormOptions]="{updateOn: 'submit'}">

In the case of Reactive forms, you can add the option like so:

ngOnInit() {
  this.newUserForm = this.fb.group({
    userName: ['Bob', { updateOn: 'blur', validators: [Validators.required] }]
  });
}

9. Animations in Angular 5

In Angular 5, we have two new transition aliases,

:increment

:decrement

...
animations: [
  trigger('bannerAnimation', [
   transition(":increment", group([
     query(':enter', [
       style({ left: '100%' }),
       animate('0.5s ease-out', style('*'))
     ]),
     query(':leave', [
       animate('0.5s ease-out', style({ left: '-100%' }))
     ])
   ])),
   transition(":decrement", group([
     query(':enter', [
       style({ left: '-100%' }),
       animate('0.5s ease-out', style('*'))
     ]),
     query(':leave', [
       animate('0.5s ease-out', style({ left: '100%' }))
     ])
   ])),
 ])
]

Animation queries now support negative limits, in which case elements are matched from the end rather than from the beginning like so:

...
animations: [
 trigger(
   'myAnimation',
   [
     transition(
         '* => go',
         [
           query(
               '.item',
               [
                 style({opacity: 0}),
                 animate('1s', style({opacity: 1})),
               ],
               {limit: -3}),
        ]),
   ]),
]
...

10. New Router Lifecycle Events in Angular 5

Some new lifecycle events have been added to the router. The events are

GuardsCheckStart

ChildActivationStart

ActivationStart

GuardsCheckEnd

ResolveStart

ResolveEnd

ActivationEnd

ChildActivationEnd

Furthermore, you can now configure the router to reload a page when it receives a request to navigate to the same URL.

providers: [
  // ...
  RouterModule.forRoot(routes, {
    onSameUrlNavigation: 'reload'
  })
]

11. Better Support for Service Workers in Angular 5

In Angular 5, we have better support for service workers via the @angular/service-worker package. The service worker package is a conceptual derivative of the

@angular/service-worker

Note: Right now you will have to manually integrate the package because it's not fully integrated with the CLI v1.5 yet. It is available as beta in version 1.6 of the CLI.

Deprecations and Other Updates

• NgFor

  has been removed as it was deprecated since v4. Use

  NgForOf

  instead. This does not impact the use of

  *ngFor

  in your templates.
• The compiler option

  enableLegacyTemplate

  is now disabled by default as the

  <template>

  element was deprecated since v4. Use

  <ng-template>

  instead. The option

  enableLegacyTemplate

  and the

  <template>

  element will both be removed in Angular v6.
• The method

  ngGetContentSelectors()

  has been removed as it was deprecated since v4. Use

  ComponentFactory.ngContentSelectors

  instead.

• ReflectiveInjector

  is now deprecated. Use

  Injector.create

  as a replacement.

• NgProbeToken

  has been removed from

  @angular/platform-browser

  as it was deprecated since v4. Import it from

  @angular/core

  instead.

Check out other Angular 5 updates here.

Upgrading to Angular 5

The Angular team built a nifty tool to make upgrading as easy as possible.

Angular 5 upgrade tool

auth0-spa-js

npm install @auth0/auth0-spa-js

environment.ts

src/environments

CLIENT_DOMAIN

CLIENT_ID

// src/environments/environment.ts

export const environment = {
  production: false,
  auth: {
    CLIENT_DOMAIN: 'YOUR_DOMAIN',
    CLIENT_ID: 'YOUR_CLIENT_ID',
  },
};

export const config = {};

AuthService

ng generate service auth

src/app/auth.service.ts

//src/app/auth.service.ts

import { Injectable } from '@angular/core';
import createAuth0Client from '@auth0/auth0-spa-js';
import Auth0Client from '@auth0/auth0-spa-js/dist/typings/Auth0Client';
import {
  from,
  of,
  Observable,
  BehaviorSubject,
  combineLatest,
  throwError,
} from 'rxjs';
import { tap, catchError, concatMap, shareReplay } from 'rxjs/operators';
import { Router } from '@angular/router';
import { environment } from './../environments/environment';

@Injectable({
  providedIn: 'root',
})
export class AuthService {
  // Create an observable of Auth0 instance of client
  auth0Client$ = (from(
    createAuth0Client({
      domain: environment.auth.CLIENT_DOMAIN,
      client_id: environment.auth.CLIENT_ID,
      redirect_uri: `${window.location.origin}`,
    }),
  ) as Observable<Auth0Client>).pipe(
    shareReplay(1), // Every subscription receives the same shared value
    catchError((err) => throwError(err)),
  );
  // Define observables for SDK methods that return promises by default
  // For each Auth0 SDK method, first ensure the client instance is ready
  // concatMap: Using the client instance, call SDK method; SDK returns a promise
  // from: Convert that resulting promise into an observable
  isAuthenticated$ = this.auth0Client$.pipe(
    concatMap((client: Auth0Client) => from(client.isAuthenticated())),
    tap((res) => (this.loggedIn = res)),
  );
  handleRedirectCallback$ = this.auth0Client$.pipe(
    concatMap((client: Auth0Client) => from(client.handleRedirectCallback())),
  );
  // Create subject and public observable of user profile data
  private userProfileSubject$ = new BehaviorSubject<any>(null);
  userProfile$ = this.userProfileSubject$.asObservable();
  // Create a local property for login status
  loggedIn: boolean = null;

  constructor(private router: Router) {
    // On initial load, check authentication state with authorization server
    // Set up local auth streams if user is already authenticated
    this.localAuthSetup();
    // Handle redirect from Auth0 login
    this.handleAuthCallback();
  }

  // When calling, options can be passed if desired
  // https://auth0.github.io/auth0-spa-js/classes/auth0client.html#getuser
  getUser$(options?): Observable<any> {
    return this.auth0Client$.pipe(
      concatMap((client: Auth0Client) => from(client.getUser(options))),
      tap((user) => this.userProfileSubject$.next(user)),
    );
  }

  private localAuthSetup() {
    // This should only be called on app initialization
    // Set up local authentication streams
    const checkAuth$ = this.isAuthenticated$.pipe(
      concatMap((loggedIn: boolean) => {
        if (loggedIn) {
          // If authenticated, get user and set in app
          // NOTE: you could pass options here if needed
          return this.getUser$();
        }
        // If not authenticated, return stream that emits 'false'
        return of(loggedIn);
      }),
    );
    checkAuth$.subscribe();
  }

  login(redirectPath: string = '/') {
    // A desired redirect path can be passed to login method
    // (e.g., from a route guard)
    // Ensure Auth0 client instance exists
    this.auth0Client$.subscribe((client: Auth0Client) => {
      // Call method to log in
      client.loginWithRedirect({
        redirect_uri: `${window.location.origin}`,
        appState: { target: redirectPath },
      });
    });
  }

  private handleAuthCallback() {
    // Call when app reloads after user logs in with Auth0
    const params = window.location.search;
    if (params.includes('code=') && params.includes('state=')) {
      let targetRoute: string; // Path to redirect to after login processed
      const authComplete$ = this.handleRedirectCallback$.pipe(
        // Have client, now call method to handle auth callback redirect
        tap((cbRes) => {
          // Get and set target redirect route from callback results
          targetRoute =
            cbRes.appState && cbRes.appState.target
              ? cbRes.appState.target
              : '/';
        }),
        concatMap(() => {
          // Redirect callback complete; get user and login status
          return combineLatest([this.getUser$(), this.isAuthenticated$]);
        }),
      );
      // Subscribe to authentication completion observable
      // Response will be an array of user and login status
      authComplete$.subscribe(([user, loggedIn]) => {
        // Redirect to target route after callback processing
        this.router.navigate([targetRoute]);
      });
    }
  }

  logout() {
    // Ensure Auth0 client instance exists
    this.auth0Client$.subscribe((client: Auth0Client) => {
      // Call method to log out
      client.logout({
        client_id: environment.auth.CLIENT_ID,
        returnTo: `${window.location.origin}`,
      });
    });
  }
}

ng generate component login-button

src/app/login-button/login-button.component.ts

//src/app/login-button/login-button.component.ts

import { Component, OnInit } from '@angular/core';
import { AuthService } from '../auth.service';

@Component({
  selector: 'app-login-button',
  templateUrl: './login-button.component.html',
  styleUrls: ['./login-button.component.css'],
})
export class LoginButtonComponent implements OnInit {
  constructor(public auth: AuthService) {}

  ngOnInit() {}
}

src/app/login-button/login-button.component.html

<!-- src/app/login-button/login-button.component.html -->
<div>
  <button (click)="auth.login()" *ngIf="!auth.loggedIn">Log In</button>
  <button (click)="auth.logout()" *ngIf="auth.loggedIn">Log Out</button>
</div>

<app-login-button></app-login-button>

src/app/app.component.html

Conclusion

Angular 5 came loaded with new features and significant improvements. It is smaller and faster. I am proud of what the Angular team achieved with this release.

Have you switched to Angular 5 yet? What are your thoughts? Did you notice any significant improvement? Let me know in the comments section! 😊