I am making a request as follow:

const listCompartmentsRequest: identity.requests.ListCompartmentsRequest = {
  compartmentId: id,
  compartmentIdInSubtree: true,
}

But I would like to short that long line identity.requests.ListCompartmentsRequest.

I'm expecting something like that:

const { ListCompartmentsRequest } = identity.requests

const listCompartmentsRequest: ListCompartmentsRequest = {
  compartmentId: id,
  compartmentIdInSubtree: true,
}

I tried it, however, I'm getting this error:

ListCompartmentsRequest refers to a value, but is being used as a type here. Did you mean typeof ListCompartmentsRequest?"

CodePudding user response：

From the MDN documentation for Destructuring assignment:

The destructuring assignment syntax is a JavaScript expression that makes it possible to unpack values from arrays, or properties from objects, into distinct variables.

Destructuring only applies to values, not types — TypeScript does not currently offer any equivalent kind of syntax. Instead, you can create a new type alias that represents the nested member of the type that you described. Here's an example:

TS Playground

type Identity = {
  Requests: {
    ListCompartmentsRequest: {
      compartmentId: string;
      compartmentIdInSubtree: boolean;
    };
  };
};

type ListCompartmentsRequest = Identity['Requests']['ListCompartmentsRequest'];

const id = '123';

const listCompartmentsRequest: ListCompartmentsRequest = {
  compartmentId: id,
  compartmentIdInSubtree: true,
};

And if you are targeting a type within a namespace, then you can use dot notation to access the nested type.