How to pass an object to service constructor in NgModule of angular 2/4 app

Question

So here is a service say MyService

MyService has a constructor in its implementation

@Injectable() 
export class MyService {
    constructor(myObject: MyClass) {}
}

Now myObject is of type MyClass which I need to pass while injecting the service

One way by which I can use MyService is

_myService = new MyService(new Myclass())

and then access methods in MyService

this._myService.someMethod();

But with this approach I have to do this in every component where I use MyService

I want to pass the value to MyService constructor in NgModule in providers array

So that in any component I need MyService I can just use by

export class MyComponent {
    constructor( _myService: MyService) {}
    this._myService.someMethod();
}

Answer 1

So I figured out how to do it

It can be done by using useFactory in the following manner

{
  provide: MyService, 
  useFactory: MyServiceFactory  
}

export function MyServiceFactory() {
  return new MyService(new MyClass());
}

This will pass the MyClass object which is required by MyService constructor and the service can be injected henceforth into any component.

export class MyComponent {
  constructor( _myService: MyService) {}
}