How might I structure a server reply to appear distinct?

My server query can receive two types of responses:

interface Response {
  [id: string]: Data
}

or

interface Response {
  error: string
}

However, I am encountering an error message that says:

Property 'error' of type 'string' is not assignable to string index type '{ /* Structure of Data */ }'.

What would be the correct way to type this object?

Answer №1

To specify the server's response type, you can create a union of data response and error response as shown below:

interface DataResponse {
    [id: string]: Data
}

interface ErrorResponse {
    error: string
}

type ServerResponse = DataResponse | ErrorResponse;

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