LoadedData.ts

type LoadedData<A> =
  <B>(f: (a: A) => B, g: (e: Error) => B, b: B) => B;

function loaded<A>(a: A): LoadedData<A> {
  return <B>(f: (a: A) => B, error: (e: Error) => B, empty: B) => f(a);
}

function error<A>(e: Error): LoadedData<A> {
  return <B>(success: (a: A) => B, f: (e: Error) => B, empty: B) => f(e);
}

function loading<A>(): LoadedData<A> {
  return <B>(success: (a: A) => B, error: (e: Error) => B, e:B ) => e;
}