apispec.ts

interface MisingEmail {
  status: 400;
  body: { error: "MISSING_EMAIL"}
}

interface MissingPassword {
  status: 400;
  body: { error: "MISSING_PASSWORD" }
}

interface InvalidPassword {
  status: 401;
  body: { error: "INVALID_PASSWORD" }
}

interface Success {
  status: 200;
  body: { token: string }
}

type LoginApiResponse = MissingEmail | MissingPassword | InvalidPassword | Success;

// Doesn't work, but illustrative of what I want
type AxiosApiResponse = Omit<LoginApiResponse, 'body'> & { data: typeof LoginApiResponse.body };