A demonstration of "dependency hell" -- in particular, the problem of conflicting dependencies.

bar.js

var x = require('x-1.3');
var foo = require('foo');

// Doesn't work because x is expecting v1.2 of the Thing interface.
foo.wiggle(x.makeThing());

foo.js

var x = require('x-1.2');

function wiggle(thingFromX) {
  thingFromX.doSomething();
}

I'm pretty sure this is an unsolveable problem.
Detectable, yes, but not (generally) solvable. It basically boils down to type incompatibilities (Something that Javascript hides on first sight, but it's that), where the type of something changes between versions.