Type `MockObject` as "{[key: string]: Information}|undefined" in Typescript

Hello, I've encountered this type mentioned in the title {[id: string]: Details}|null and the Details interface is defined as follows:

export interface Details
{
  id: number;
  name: string;
  info: string;
}

I'm wondering how I can mock this. It's easy to mock the Details part like so:

getDetails(): Details {

       const detailsOne =  (): Details => {
           return {
                id: 300,
                name: "Some Name",
                info: "Some Info"
          } as Details
      }

      return detailsOne();
}

However, I'm struggling to understand how to return it within the [id: string] constraint as well.

Answer №1

The {[id: string]: Details}|null type is equivalent to

Record<string, Details> | null
and its structure representation is as follows:

type T = Record<string, Details> | null;
const x: T = {
  'someKey': {
      id: 500,
      name: "Another Name",
      info: "More Info"
  }
}
// or
const y: T = null

The T type consists of two valid members - a mapping of key->value pairs with keys of type string and values as objects of type Details, or null

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