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

Question

API data:

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

My code has a photos variable and a method called getPhotos() 

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
    )
}

For the next call, I get back 

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

Can someone help me with why jsfiddle.net/ca46hLw9 doesn't work?

Answer 1

For TypeScript 2.1 and higher, you can do it like this instead

let obj = { x: 1, y: "string" };
var newObj = {...obj, z: 3, y: 4}; // { x: number, y: number, z: number }