utils.ts

const isNone = (value: unknown) => value === None

const hasNone = (arr: Array<unknown>) =>
  arr.some((x) => x === None)

const map = <T, S>(
  fn: (x: T) => S,
  value: T | typeof None
) => {
  if (value === None) {
    return None
  } else {
    return fn(value)
  }
}