All of those can be pretty much be handled natively, and obviously. They're all primitive
isFalse would be !=
isObject would use typeOf
isFucntion would use typeOf
Where a library becomes helpful is when you have:
* A real problem (none of those are real problems, and the npm packages for them are essentially unused jokes)
* A solution that is not intuitive, or has a sharp edge, or requires non-obvious knowledge, or does not have a preexisting std approach
Checking for a promise, given the constraints of having multiple types of promises out in the world, falls into both of those. Checking if something is falsey, when Javascript provides !, does not fall into either.
