IsNegativeNumber

Hard
20.0% Acceptance

Sometimes when working with numeric literals, we need to rule out (or enforce) that the provided number is a positive integer.

To do that, we first need a way to tell if the number is negative.

Write a type-level function IsNegativeNumber that accepts a number N and returns:

  • true if N is negative
  • false if N is positive
  • false if N is 0,
  • never if N is number
  • never if N is a union