Typescript : Property does not exist on type 'object'

Question

I have the follow setup and when I loop through using for...of and get an error of :

Property "country" doesn't exist on type "object".

Is this a correct way to loop through each object in array and compare the object property value?

let countryProviders: object[];

export function GetAllProviders() {
   allProviders = [
      { region: "r 1", country: "US", locale: "en-us", company: "co 1" },
      { region: "r 2", country: "China", locale: "zh-cn", company: "co 2" },
      { region: "r 4", country: "Korea", locale: "ko-kr", company: "co 4" },
      { region: "r 5", country: "Japan", locale: "ja-jp", company: "co 5" }
   ]

   for (let providers of allProviders) {
      if (providers.country === "US") { // error here
         countryProviders.push(providers);
      }
   }
}

Answer 1

You probably have allProviders typed as object[] as well. And property country does not exist on object. If you don't care about typing, you can declare both allProviders and countryProviders as Array<any>:

let countryProviders: Array<any>;
let allProviders: Array<any>;

If you do want static type checking. You can create an interface for the structure and use it:

interface Provider {
    region: string,
    country: string,
    locale: string,
    company: string
}

let countryProviders: Array<Provider>;
let allProviders: Array<Provider>;