Using TypeScript and Object assign gives me an error property assign does not exist on type ObjectConstructor

Question

I am writing my question again because earlier it made little sense and I wasn't very clear.

I am receiving data from API that looks something like this:

{"photos":[{"id":1,"title":"photo_1_title"}]}

So, in my code, I have a photos variable, and a method called getPhotos()

I am using infinite scroll so when I reach the bottom of the page, I call getPhotos() again.

photos: any;

getPhotos() {
  this.photoService.getPhotos()
    .subscribe(
      photos => this.photos = photos
      // here, instead of doing this, I want to add the array of photos I get back to this.photos using Object.assign however it is giving me the said error
    )
}

So if the next time I call it, I get back {"photos":[{"id":2,"title":"photo_2_title"}]}, then I am trying to set this.photos to be

{"photos":[{"id":1,"title":"photo_1_title"}, {"id":2,"title":"photo_2_title"}]}

can someone help me with why
jsfiddle.net/ca46hLw9 doesn't work? I thought assign is supposed to merge contents of an object together right?

Answer 1

You can use type assertion, like this:

(<any>Object).assign(this.success, success.json())