Angular utilizes specific syntax for declaring modules, components, and services, as shown in the example below:
@Component({
...
})
export class AppComponent
However, this syntax is not commonly seen in traditional JavaScript development. It begs the question - was this syntax created specifically for Angular, or is it part of a newer specification like ES7?
One of the powerful language features in Typescript is its support for decorators. Angular takes advantage of this feature to enhance its framework by introducing special features like @Component, services labeled with @Injectable, and modules marked with @NgModule.
With the introduction of Classes in TypeScript and ES6, there are now scenarios that demand additional functionalities to annotate or modify classes and class members. Decorators offer a solution by allowing developers to add annotations and a meta-programming syntax for class declarations and members. Decorators are currently a stage 2 proposal for JavaScript and are accessible as an experimental feature of TypeScript.
As an illustration, the Angular documentation for Component explains:
This decorator designates a class as an Angular component and includes configuration metadata that specifies how the component should be handled, created, and utilized during runtime.
This content provides insights on decorators specifically in connection to TypeScript.
Decorators are a unique type of declaration that can be assigned to various elements such as class declarations, methods, accessors, properties, or parameters. Using the syntax @expression, decorators require expression to be a function that will execute during runtime with details regarding the element being decorated.
https://www.typescriptlang.org/docs/handbook/decorators.html#class-decorators
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