What is New in Angular 9 and how to update old version ?

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Angular 9 was published on February 7, 2020. Version 9 passes all applications to do the Ivy compiler and runtime by default. Angular has been updated to run with TypeScript 3.6 and 3.7. In increase to 100 of bug fixes, the Ivy compiler and runtime allows many advantages:

The 9.0.0 release of Angular is here! That is a larger release that crosses the whole platform, including the framework, Angular Material, and the CLI. The release shifts applications to the Ivy compiler and runtime by default and offers enhanced ways of testing components.


That is one of the largest updates to Angular we have done in the earlier 3 years and we are charged for all of the ways it allows developers to build more reliable applications and provide to the Angular ecosystem
How to update to version 9
Proceed to this website update.angular.io for complete knowledge and guidance. To have the biggest update practice, we suggest your initial update to the last release of Angular 8.
First, update to the newest version of 8
ng update @angular/cli@8 @angular/core@8
Now, update to 9
ng update @angular/cli @angular/core
Ivy
Version 9 runs all applications to do the Ivy compiler and runtime by default. In increasing to hundreds of bug fixes, the Ivy compiler and runtime allows many advantages:
·         Smaller bundle sizes
·         Faster testing
·         Great debugging
·         Updated CSS class and style coupling
·         Fixed type checking
·         Fixed build errors
·         Fixed build times, allowing AOT on by default
·         Bettered Internationalization
Smaller bundle sizes
The Ivy compiler has done created to extract parts of Angular that aren’t doing done via tree-shaking and to make less code for every Angular component.
With those changes, little apps, and large apps can see the most exciting size savings.
·         Little apps that don’t accept various Angular features that can help most from tree-shaking.
·         Big apps with several components can help most from the controlled facility size.
·         Medium-sized apps should observe bundle sizes that are on par or slightly less considering all benefit less from tree-shaking and don’t have sufficient components to truly leverage fewer factories.

Faster testing
We have also revised the implementation of TestBed in Ivy to make it extra useful.
Before, TestBed would recompile all components in the running of each test, although of whether there were any modifications done to components (for example, through overrides).
In Ivy, TestBed doesn’t recompile parts in tests except a component has been manually revoked, which enables it to withdraw recompilation between the grand majority of tests.
With this update, the framework’s core taking tests are about 40% faster. We would require users to see their own application test speeds to be around 40–50% faster.

Better debugging
Ivy gives you larger tools to debug your applications. When running an application in Dev Mode with the Ivy runtime, we now offer the new  ng object for debugging.
·         You can ask Angular for a way to occurrences of your components, directives, and more
·         Manually call methods and update the state
·         When you require to see the results of change disclosure, you can trigger change detection with applyChanges

Ivy also increases the total trace for debugging problems such as the ExpressionChangedAfterItHasBeenCheckedError. Before the stack trace could be unhelpful:
By Ivy, you view an extra helpful stack trace that enables you to jump straight to the template instruction with the appearance that has changed.

Improved CSS class and style binding
The Ivy compiler and runtime executes changes for handling styles. Previously, if an application accepted fencing solutions for a style, those styles would destructively succeed each other. With Ivy, the styles are mixed in an expected way.

Improved type checking
The Angular the compiler can examine more of the types of your application, and it can apply extra strict rules. These articles will help you and your team find bugs beginning in the development process.
Improved build errors
The new Ivy the compiler is not only faster and allows the more effective type of safety, but it also offers each of the error messages easier to read.

Improved build times, enabling Ahead-of-Time compiler by default

Thanks to Ivy’s new construction, we’ve made important changes to the compiler’s execution.
We hold our compiler’s achievement in terms of the overhead on top of a plain TypeScript collection of an application. For our documentation app (angular.io), this overhead subtracted from 0.8x to 0.5x with Ivy, an increase of approximately 40%.
Improved internationalization (i18n)
Internationalization must be a core feature of Angular, where you could develop your application once per locale and take really optimized and limited applications. In 9.0, we’re executing this active by leading the build-time i18n changes following in the build method. This variation allowed us to get it up to 10 times faster.

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