JavaScript Code Contract Libraries?

Question

I am just starting up a new web application and I want to implement some form of contract\'esque style validation in my JavaScript. I did some quick googling, and came across Js

Answer 1

I also have thrown together my idea of type contracts, which does what I want. A little late, I think, but I'll recommend it nevertheless for people willing to look at it: https://github.com/lindem/FirstContract

It's a WIP, but I needed something like it.

function bmi (weight, height) {
    return weight / height * height;
}

var c = require("firstcontract").c
    /* 
     * contract applies to function taking two non-negative numbers,
     * returning a negative number: 
     */
    , contract = c(["R+0", "R+0"], "R+0")
    , cbmi = contract(bmi)
    ;

it was created so that I can add and remove it without changing the function monitored itself and provides just a clamp around the function. It's commonjs and on npm.