Refactor: Input validation

[rodolfopietro97]

We can add a validator package for input validations. Commonly we have:

function x(input) {
   // ... validate input ...
   assert(...)

   // Flow
   doSomeStuff(input)
}

Why cannot create a validation dependently by input type and function?

function x(input) {
   // ... validate input ...
   Validator.validateInput<typeof(input)>(input, functionName)

   // Flow
   doSomeStuff(input)
}