This is a difference between JSCS and ESLint one-var/disallowMultipleVarDecl rules, i figure it is easier to change the code then to propose changes in ESLint

Are you saying ESLint doesn't allow multiple var statements?

@cowboy has some good opinions on that. So Grunt would definitely prefer to use multiple var statements.

With

"one-var": [
  "error",
  {
    "uninitialized": "always",
    "initialized": "never"
  }
]

It doesn't allow "initialized" values with different var keywords. I believe it satisfy the idea in the blog post you mentioned (see "In summary" at the end) -

My rule is as-follows: I’ll put multiple comma-separated declarations in a single var statement, but only if they don’t have assignments.

// SIMPLE AND SEXY

var foo, bar, baz;
var abc = 1;
var def = 2;

In any case, if you want me to change this rule or omit it, I can do that too

Ah cool. Thanks for pointing that out. Could we put the declarations onto one line and just concat the code comments with and?

done

19.0.0 is not used since it doesn't supports node < 4, which means you can't use ESLint 3.0, we can apply same approach as in jquery repo though - jquery/jquery@030191a

But if you do, i would suggest to do this in separate commit

yeah we can do that!