Standard allows you to use a var before it's declared

[dcposch]

I don't know if this is intentional, but standard doesn't warn about this:

function foo () {
  console.log('' + x) // prints undefined
  var x = 5
}

[qzb]

Yes, this is intentional (at least for now): #636

[feross]

I would like standard to catch this issue, but can't enable the relevant rule until eslint/eslint#7111 is fixed.

So, yes, this is intentional for now. See #636 (comment) for explanation.