IT industry insights with the tag Angular
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Angular v16 News: Revolution in Reactivity, Server-side Rendering, and Tools for Independent Components
Last year, the Angular team introduced a standalone API as part of the developer preview. Now, we present a groundbreaking update for Angular version 16, bringing significant advancements in reactivity, server-side rendering, and new tools. It's all a result of dozens of improvements in response to user feedback. Reactivity Revolution In the v16 release, we introduce a completely new reactivity model for Angular, which brings significant performance and developer experience improvements. It's fully backward compatible and interoperable with the existing system, and it enables: Improved real-time performance by reducing computations during change detection. After deploying Angular Signals, we expect a significant improvement in the INP Core Web Vital metric for signal-driven applications. It introduces a simpler mental model for reactivity, clearly defining dependencies between views and data flow throughout the application. It enables more precise reactivity, allowing us to monitor changes only in affected components in future versions. Makes Zone.js optional in future versions by using signals to notify the framework of changes in the model. It provides property computations without the penalty of re-computation in every change detection cycle. Enhances interoperability with RxJS by introducing a plan for reactive inputs. In v16, you'll find a new Signals library that is part of @angular/core, as well as an RxJS interop package - @angular/core/rxjs-interop. Angular Signals The Angular Signals library allows you to define reactive values and express dependencies between them. You can learn more about the library's features in the relevant RFC document. Here's a simple example of using it in Angular: The code above creates a computed value fullName that depends on the signals firstName and lastName. We also declare an effect whose callback function will run whenever we change the value of any of the observed signals - in this case, fullName, which indirectly depends on firstName and lastName. When we set the value of firstName to Mark, the browser will log: Name changed: Mark Doe RxJS Interoperability You'll be able to easily lift signals to observables using functions from the @angular/core/rxjs-interop package, which is available as part of the v16 release! Here's how you can transform a signal into an observable: ... and here's an example of transforming an observable into a signal to avoid using the async pipe: Many Angular users want to end data flows when an action related to a particular topic concludes. The following pattern illustrates this and is quite common: A new RxJS operator called takeUntilDestroyed has been introduced, simplifying this pattern to the following form: By default, this operator will inject the current cleanup context. For example, it will use the component's lifecycle in a component. takeUntilDestroyed is especially useful when you want to tie the observable's lifecycle to the specific component's lifecycle. Server-side Rendering and Hybridization Based on annual developer surveys, server-side rendering emerges as a crucial improvement in Angular. In recent months, the Angular team has collaborated with the Chrome Aurora team to boost performance and enhance developer experiences in the area of hybridization and server-side rendering. Now, a developer preview of full hybridization is available without disrupting the application's functionality. Angular Hybridization - a new option. In full hybridization without Angular destruction, Angular stops recreating the application from scratch. The framework identifies existing DOM nodes, creates internal data structures, and assigns event listeners to those nodes. The benefits include: No content flickering for end users. Better Core Web Vitals metrics in certain scenarios. A future-ready architecture allowing the loading of fine-grained code using elements we'll provide later this year. Currently, it's visible as progressive delaying of route hybridization. Easy integration with existing applications in just a few lines of code. Incremental adoption of hybridization with the ngSkipHydration attribute in components that manually manipulate the DOM. In early tests, we've seen up to a 45% improvement in Largest Contentful Paint with full hybridization! To get started, simply add a few lines of code to your main.ts file: New Server-side Rendering Features In the v16 release, the extension schema for ng in Angular Universal has been updated, allowing server-side rendering to be added to projects using the standalone API. Furthermore, we now support a stricter content security policy. Enhancements for Standalone Components, Directives, and Pipes To support developers in migrating their applications to the standalone API, migration schematics and a migration guide have been developed. When you're in your project directory, run the following command: Zone.js Configuration Zone.js configuration has been added through a new API called bootstrapApplication when using the standalone API. We've added this option, which allows for Zone.js configuration using the new provideZoneChangeDetection API: Developer Tooling Several key features from Angular CLI and the language service. Developer Preview of esbuild-based Build System In Angular v16, the esbuild-based build system enters the developer preview phase! Previous tests have shown over a 72% improvement in production build performance. Now, ng serve will use Vite as the development server, and esbuild powers both the development and production processes! To enable this feature, add the following to angular.json: Improved Unit Testing with Jest and Web Test Runner Experimental support for Jest has been added, and in future versions, migration from Karma to Web Test Runner is possible. Enhancing Developer Experience Required Inputs In v16, you can now mark inputs as required: Passing Router Data as Component Inputs Now you can pass the following data as component inputs for routing: Path parameters Query parameters Location data You can enable this feature using withComponentInputBinding as part of the provided router. Flexible ngOnDestroy Angular's lifecycle hooks provide various opportunities to hook into different points in your application's execution. One request over the years has been to provide more flexibility, such as accessing OnDestroy as an observable function. In v16, the ability to inject OnDestroy has been introduced, giving developers the flexibility they've asked for. This new feature allows injecting a DestroyRef corresponding to a component, directive, service, or pipe, and registering an onDestroy hook. DestroyRef can be injected anywhere in the injection context, even outside the component; in this case, the onDestroy hook will be triggered when the corresponding injector is destroyed. Self-Closing Tags Self-closing tags have been added, here's an example:
Updating Angular Version in Your Project: Step by Step
Sometimes there is a need to upgrade the Angular version in our project in order to use the latest features, fix bugs, or improve the application's performance. In this step-by-step guide, you will learn how to do that. Step 1: Check the Current Angular Version Before you begin the Angular update, it's worth finding out which version of Angular you are currently using. You can check this by navigating to the project directory and running the following command in the command line: This command will display information about the current version of Angular and other CLI tools used in the project. Save this information so you can compare it to the new version after the update. Step 2: Update Angular CLI Angular CLI is a tool for managing Angular projects. It is recommended to update the CLI as the first step. You can do this by executing the following command: This command will automatically update Angular CLI to the latest available version. After the update is completed, check if the new CLI version is installed correctly by running the ng version command again. Step 3: Update Angular Version Now that Angular CLI has been updated, you can proceed to update Angular itself. Use the following command to update Angular: The CLI will automatically update Angular to the latest available version. This may take a few moments depending on the number of changes in the new version. Step 4: Resolve Conflicts and Errors After the update, it's a good practice to test the project and ensure that everything is functioning correctly. Often, a new version of Angular introduces changes in the API or internal project structures, which can lead to conflicts or errors. If you encounter errors, read the console feedback to identify the issue. Then, follow the recommendations to resolve the errors. Remember, this is an important step to ensure that your project is stable after the update. Step 5: Update Dependencies During the Angular update, it may be necessary to update other project dependencies, such as libraries, modules, tools, or scripts. Make sure that all dependencies are updated to versions compatible with the new Angular version. This is especially important to avoid conflicts and errors during project operation. Step 6: Test the Project After completing the project update process, test it to ensure that everything is working as expected. Perform unit tests, check the site, navigate through it, and verify that all features are functioning correctly. This is a crucial step to ensure that your project is functioning as intended.
IT industry insights with the tag Angular
Fascinating Facts About Angular - A Modern Framework for Web Application Development
Angular is a popular framework for building web applications, offering tools for constructing scalable, dynamic user interfaces. Let's explore some fascinating facts about Angular:
Component-Based Structure
Angular is based on a component-based structure. This means that user interfaces are created using components that can be reused and combined to build more complex applications.
TypeScript Language
Angular is written in the TypeScript language, which means that developers use advanced static typing. This helps detect errors at compile time and create more reliable code.
Cross-Platform Capability
Angular enables the creation of applications that can run on various platforms, including web browsers, mobile systems, and desktops. This significantly expands the reach of applications.
Angular CLI
Angular CLI is a command-line tool that simplifies creating, developing, and testing Angular applications. This tool provides ready-made templates and commands for automating various tasks.
Strong Community
Angular has a thriving developer community that provides many resources, tools, and extensions. This gives developers access to support and resources.
Extensions and Libraries
Angular has an extensive ecosystem of extensions and libraries that allow adding various features to applications. Among them are tools for state management, routing, event handling, and more.
High Performance
Angular focuses on performance and efficiency. Mechanisms such as Ahead-of-Time (AOT) compilation and Lazy Loading make Angular applications fast and efficient to use.
Reactive Forms
Angular offers reactive forms that allow easy management of input and output data in applications. This simplifies form validation and handling.
The Future of Angular
Angular continues to evolve, with Google developers and the developer community working on new features and improvements. Updates and enhancements are planned, making Angular a modern tool for application development.
Advanced Developer Tools
Angular provides advanced developer tools that allow analysis and debugging of applications. Angular DevTools and Angular Console make it easier for developers to work.
Modularity
Angular encourages modular design. Angular applications are organized into modules, making it easier to manage and scale projects.
State Management
Angular offers various approaches to state management in applications, including the use of tools like NgRx, which helps create more transparent and scalable applications.
Internationalization (i18n)
Angular supports internationalization (i18n), meaning applications can be easily translated into different languages and customized for different geographic regions.
Security
Angular takes care of application security by offering protection mechanisms against XSS (Cross-Site Scripting) attacks and other threats.
Integration with Other Technologies
Angular is flexible and allows integration with other technologies, such as Web Components and various backend servers. This provides developers with significant opportunities for integration with existing systems.
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