Angular
Exploring Standalone Components in Angular
Introduction
Angular has used NgModules to structure and maintain components, directives, and services for a long time. Standalone Components are now introduced with Angular 14. This will enable developers to create Angular applications in a less dependent and highly modular way. In this, we are going to find out what standalone components are, why they matter, and how you can use them effectively.
What Are Standalone Components?
Standalone components are self-contained Angular components that do not require a NgModule to work. This allows you to create modular, reusable components with minimal boilerplate code. A standalone component can import dependencies directly, which means it reduces the need for a shared module.
Key Features of Standalone Components:
- Do not require declaration inside a NgModule.
- Can import other standalone components, directives, and pipes directly.
- Promote better code organization and reusability.
- Improve tree-shakability by reducing unnecessary module dependencies.
Creating a Standalone Component
To create a standalone component in Angular, use the --standalone flag with the Angular
CLI: ng generate component my-component --standalone
Alternatively, you can manually define a standalone component by setting standalone: true in the component decorator:
import { Component } from '@angular/core';@Component({ selector: 'app-my-component', template: '<h2>Hello, Standalone Component!</h2>', standalone: true,})export class MyComponent {}Using Standalone Components in Your App
You can use standalone components directly in other components or bootstrap them without a module.
Importing in Another Standalone Component
import { Component } from '@angular/core';import { MyComponent } from './my-component';@Component({ selector: 'app-root', template: '<app-my-component></app-my-component>', standalone: true, imports: [MyComponent]})export class AppComponent {}
Bootstrapping a Standalone Component
Instead of bootstrapping an NgModule, you can bootstrap a standalone component directly in main.ts:
import { bootstrapApplication } from '@angular/platform-browser';import { AppComponent } from './app.component';bootstrapApplication(AppComponent);Advantages of Standalone Components
- Easy Structure: This eliminates unnecessary NgModules, therefore less boilerplate code.
- Increased Code Reusability: One can import a component independently which makes it a better module
- Faster App Start-up Time: Reduces the dependencies. It improves application start-up time.
- Better Tree Shaking: The unused components and dependencies become easier to remove. This ensures the final bundle size is much smaller.
When to Use Standalone Components
- While developing a new Angular applications from scratch.
- When working on micro front-ends or modular architectures.
- When migrating legacy applications by incrementally converting components to standalone.
- When building reusable UI components that can be used across multiple applications.
Best Practices
Standalone components in Angular are modern, flexible building blocks for reduced complexity and improved performance. Though NgModules are still supported, moving towards standalone components can help make your Angular projects more maintainable and modular. If you haven't tried standalone components yet, now's a great time to start experimenting with them!
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