In Typescript 3.4, when destructuring an object, you can define the exact response type like this:
interface IResponse {
loading: boolean;
data: any;
error: string;
}
interface IObject {
...
}
const {loading, data, error}:{data: IObject} = myResponseObject;
Essentially, you are transforming the myResponseObject.data: any type into myResponseObject.data: IObject type during destructuring. Is this possible?
To achieve this, you can use casting by extending the IResponse interface to provide a more specific definition for the data property:
interface IResponseWithTypedData extends IResponse {
data: IObject;
}
After defining the new interface, you can apply the cast when de-structuring like this:
const { data } = myResponseObject as IResponseWithTypedData;
If you make the type of data generic, you can then specify its type when destructuring:
interface IResponse<T = any> {
loading: boolean;
data: T;
error: string;
}
interface IObject {
}
declare const myResponseObject: IResponse;
const { loading, data, error }: IResponse<IObject> = myResponseObject;
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