TypeScript decorators and their usage in Angular:
TypeScript decorators provide a way to modify the behavior of classes, methods, properties, and parameters at design time. In Angular, decorators play a crucial role in configuring and customizing various aspects of components, services, and modules.

1. @Component decorator:

• Using the @Component decorator to define Angular components:

   import { Component } from "@angular/core";

   @Component({
     selector: "app-root",
     templateUrl: "./app.component.html",
     styleUrls: ["./app.component.css"]
   })
   export class AppComponent {
     // Component logic goes here
   }

• Configuring component metadata such as selector, template, styles, etc.
• Binding component properties and methods to the template
• Handling component events using event bindings

2. @Injectable decorator:

• Using the @Injectable decorator to define Angular services:

   import { Injectable } from "@angular/core";

   @Injectable({
     providedIn: "root"
   })
   export class DataService {
     // Service logic goes here
   }

• Registering services with the Angular dependency injection system
• Understanding the different provider options for service registration

3. @NgModule decorator:

• Using the @NgModule decorator to define Angular modules:

   import { NgModule } from "@angular/core";
   import { BrowserModule } from "@angular/platform-browser";
   import { AppComponent } from "./app.component";

   @NgModule({
     declarations: [AppComponent],
     imports: [BrowserModule],
     providers: [],
     bootstrap: [AppComponent]
   })
   export class AppModule {
     // Module logic goes here
   }

• Declaring and importing components, directives, and pipes within modules
• Configuring module providers for dependency injection
• Understanding the role of entry components and bootstrap components

Throughout this chapter, you’ll learn the fundamentals of TypeScript

and how to leverage its features to build robust and maintainable Angular applications. You’ll explore various TypeScript concepts, such as variables, data types, functions, classes, and decorators. Each concept will be accompanied by real-life code implementation examples to demonstrate their practical usage within an Angular project.