async-hook-result.tsx

export type AsyncHookResult<R = void> = {
  loading?: boolean
  error?: Error
  result?: R // TODO require R if loading is true
}

export function newAsyncHookLoading<R = void> (loading = true): AsyncHookResult<R> {
  return { loading }
}

export function newAsyncHookResult<R = void> (result: R): AsyncHookResult<R> {
  return { loading: false, result }
}

export function newAsyncHookError<R = void> (error: Error): AsyncHookResult<R> {
  return { loading: false, error }
}