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:

Answer 1

For typescript version 2.0 or higher, just modify the tsconfig.json file so the "lib" section includes "es6":

"lib": [
  "es5",
  "es6",
  "dom",
  "es2015.collection"
]