Skip to main content

What's New in Angular 9? Angular 9 New Features

Angular 9 is the smaller, faster, and easier to use and it will be making Angular developers life easier. The fully version of Angular 9 will be released in the month of October/November 2019.

Explore this: Angular 9 vs. Angular 8 vs. Angular 7 vs. Angular 6, 5, 4, 2

Added Angular 9 Features -
1.      Added undecorated classes migration schematic in the core.
2.      The formControlName also accepts a number in the form
3.      Now allow selector-less directives as base classes in View Engine in the compiler.
4.      Added support selector-less directive as base classes in Ivy and also make the Ivy compiler the default for ngc.
5.      Convert all ngtsc diagnostics to ts.Diagnostics
6.      bazel: support ts_library targets as entry-points for ng_package.
7.      core: add dynamic queries schematic.
8.      core: Mark TestBed.get as deprecated.
9.      ivy: expose helper and also support ng-add in localize package.
10.  ivy: i18n – add syntax support for $localize metadata block.
11.  ivy: i18n – reorganize entry-points for better reuse.
12.  language-service: enable logging on TypeScriptHost.
13.  language-service: provide diagnostic for invalid templateUrls.
14.  language-service: provide diagnostics for invalid styleUrls.


core: TestBed.get function is marked as deprecated, use TestBed.inject instead.

Performance Improvements :

  1. Binding update benchmark and also convert all node-based benchmark to use a testing harness.
  2. Avoid megamorphic reads during property binding.
  3. Avoid repeated lview reads in pipe instructions.
  4. Avoid repeated LView reads in property instructions.
  5. Avoid unnecessary DOM reads in styling instructions.
  6. Initialise TNode inputs / outputs on the first creation pass for the Ivy.
  7. limit TNode.outputs reads for the ivy.

8. The language-service, keep analyzedModules cache when source files don't change.

It looks like -
describe('TypeScriptServiceHost', () => {
  it('should not clear caches when external template changes', () => {
    const tsLSHost = new MockTypescriptHost(['/app/main.ts'], toh);
    const tsLS = ts.createLanguageService(tsLSHost);
    const ngLSHost = new TypeScriptServiceHost(tsLSHost, tsLS);
    const oldModules = ngLSHost.getAnalyzedModules();
    tsLSHost.override('/app/', '<div></div>');
    const newModules = ngLSHost.getAnalyzedModules();


Angular 9 Breaking Changes -

1) Ivy applications :- 
Previously, in Ivy applications, Hammer providers were included by default. With this commit, apps that want Hammer support must import HammerModule in their root module i.e.

import {HAMMER_PROVIDERS} from './dom/events/hammer_gestures'

2) ServiceWorker: 
Remove deprecated option versionedFiles from service worker asset group configuration in ngsw-config.json


"assetGroups": [

    "name": "test",
    "resources": {
      "versionedFiles": [


"assetGroups": [
    "name": "test",
    "resources": {
      "files": [

Angular 9 Bug Fixes -

common: update $locationShim to notify onChange listeners before emitting AngularJS events.

compiler: return enableIvy true when using readConfiguration
ivy -
1.      Get name directly from nativeNode
2.      Handle empty bindings in template type checker
3.      In ngcc, handle inline exports in commonjs code
4.      The ngcc should only index .d.ts exports within the package
5.      The ngTemplateOutlet error when switching between null and template value

language-service -
1.      Instantiate MetadataResolver once
2.      Remove 'context' used for module resolution
ngcc -
1.      Handle deep imports that already have an extension

2.      Ignore format properties that exist but are undefined

Reference link -

Compatibility note: The primary goal of the backward compatibility promise is to ensure that changes in the core framework and tooling don't break the existing ecosystem of components and applications and don't put undue upgrade/migration burden on Angular application and component authors.

Note: Angular versions ^4.0.0 and ^5.0.0 are no longer under support.
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin

25 Best Vue.js 2 Interview Questions and Answers

What Is Vue.js? The Vue.js is a progressive JavaScript framework and used to building the interactive user interfaces and also it’s focused on the view layer only (front end). The Vue.js is easy to integrate with other libraries and others existing projects. Vue.js is very popular for Single Page Applications developments. The Vue.js is lighter, smaller in size and so faster. It also supports the MVVM ( Model-View-ViewModel ) pattern. The Vue.js is supporting to multiple Components and libraries like - ü   Tables and data grids ü   Notifications ü   Loader ü   Calendar ü   Display time, date and age ü   Progress Bar ü   Tooltip ü   Overlay ü   Icons ü   Menu ü   Charts ü   Map ü   Pdf viewer ü   And so on The Vue.js was developed by “ Evan You ”, an Ex Google software engineer. The latest version is Vue.js 2. The Vue.js 2 is very similar to Angular because Evan You was inspired by Angular and the Vue.js 2 components looks like -

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from '

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVADOR

React | Encryption and Decryption Data/Text using CryptoJs

To encrypt and decrypt data, simply use encrypt () and decrypt () function from an instance of crypto-js. Node.js (Install) Requirements: 1.       Node.js 2.       npm (Node.js package manager) 3.       npm install crypto-js npm   install   crypto - js Usage - Step 1 - Import var   CryptoJS  =  require ( "crypto-js" ); Step 2 - Encrypt    // Encrypt    var   ciphertext  =  CryptoJS . AES . encrypt ( JSON . stringify ( data ),  'my-secret-key@123' ). toString (); Step 3 -Decrypt    // Decrypt    var   bytes  =  CryptoJS . AES . decrypt ( ciphertext ,  'my-secret-key@123' );    var   decryptedData  =  JSON . parse ( bytes . toString ( CryptoJS . enc . Utf8 )); As an Example,   import   React   from   'react' ; import   './App.css' ; //Including all libraries, for access to extra methods. var   CryptoJS  =  require ( "crypto-js" ); function   App () {    var   data