It's also completely valid JavaScript that does something very different than what it appears to.

    function getCount () {
      return undefined
      { // open code block
        'count': /*labelled line*/  1  //numeric expression
      } // close code block
    } // close function

LINE BREAKS CONSIDERED HARMFUL.

Which is why I'd say if you're writing javascript, use { brackets properly, and ; properly.

I agree, it's a common style, but a horrible one IMHO.