What is the best way to "connect" an interface in TypeScript?

I'm working on creating a child interface that mirrors the structure of a base interface. Any tips on how to achieve this?

interface BaseInterface {
  api: { [key: string]: string  };
  ui: { [key: string]: string  };
}

interface ChildInterface {
  // I want to ensure that this interface matches the shape of BaseInterface
  // like this:

  api: { firstName: string  };
  ui: { firstName: string  };
}

I attempted using 

type ChildInterface = BaseInterface
but struggled with customizing my ChildInterface.

Any insights would be greatly appreciated.

typescript

Answer №1

Incorporate the extends keyword to extend interfaces.

interface SubInterface extends MainInterface {
    additionalProperty:string;
}

const anotherItem : SubInterface = //...
console.log(anotherItem.api.lastName);
console.log(anotherItem.additionalProperty);

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