FortJs provides "Assign" And "Singleton" decorator for dependency Injection.

Assign

Assign can be used in controller and all type of component.

e.g -

To inject "hello world" to a variable value

export class UserController extends Controller {
    service: UserService;

    @Worker()
    index(@Assign('hello world') value) {
        console.log(value) // hello world
    }
}

Singleton

Singleton creates a single object & maintain this across whole application.

e.g -

To inject a service in a controller constructor

export class UserController extends Controller {
    service: UserService;

    constructor(@Singleton(UserService) service) {
        super();
        this.service = service;
    }
}

By using Singleton you can save memory as its create only one instance of class & maintains throughout the app.