RemoteData.ts

interface NotAsked {
  type: "NotAsked";
}

interface Loading {
  type: "Loading";
}

interface Success<T> {
  type: "Success";
  data: T;
}

interface Failure<E> {
  type: "Failure";
  error: E;
}

export type RemoteData<T, E> = NotAsked | Loading | Success<T> | Failure<E>;