Purpose of NgModule Decorator
- Modularity: One of the primary purposes of the
NgModule
decorator is to provide modularity within Angular applications. Modules allows to group related components, directives, pipes, and services together, making it easier to manage and maintain code. - Encapsulation:
NgModule
enables encapsulation by defining boundaries between different parts of the application. Each module has its own scope, and components, services, and other elements defined within a module are encapsulated and not visible to other modules by default that prevents naming conflicts and promoting code isolation. - Dependency Injection Configuration:
NgModule
provides a mechanism for configuring dependency injection within Angular applications. By specifying providers at the module level, You can ensure that services are available for injection throughout the module and its components. - Bootstrapping: The
bootstrap
property inNgModule
is used to specify the root component of the application. This tells Angular which component to bootstrap when the application starts, serving as the entry point of the application’s component tree. - Compilation and Optimization: Angular’s compiler uses information provided by
NgModule
decorators to compile templates, optimize performance, and generate efficient code bundles for deployment.NgModule
helps Angular optimize the application’s loading time and runtime performance.
Purpose of NgModule Decorator in Angular
The NgModule decorator in Angular is like a blueprint for organizing and configuring different parts of your application. It’s like a set of instructions that tells Angular how to assemble the various components, directives, pipes, and services into cohesive units called modules. These modules help in managing dependencies, defining routing rules, and configuring providers.
Essentially, the NgModule decorator serves as a central hub for defining and organizing the building blocks of an Angular application, making it easier to develop, maintain, and scale complex web applications.
Table of Content
- Features of NgModules
- Purpose of NgModule Decorator
Angular NgModules are also classes with ‘@NgModule’ and it has metadata that describes how the different parts of the application will work together. Like javascript modules have their own files but NgModule does not have their own file, they only include metadata. it also helps to organize the components and services of the angular application.
Syntax:
import { NgModule } from '@angular/core';
@NgModule({
declarations: [ /* Components, directives, and pipes */],
imports: [ /* Other modules */],
exports: [ /* Exports of this module */],
providers: [ /* Services */],
bootstrap: [ /* Root component */]
})
export class MyNgModule { }
Here, declarations is the array of components, directives, and pipes that belong to this module, imports is the array of other modules that this module depends on, exports is the array of declarations that should be visible and accessible to components in other modules, providers are the array of services available for injection within this module and bootstrap is the array containing the root component(s) to bootstrap when this module is loaded.