This is something we've been inconsistent about. I wish we could have a lint for this as I'm opposed to humans linting code. My general thoughts: If you break to the next line, try to line it up with something meaningful e.g.
```js
function(arg1,
         arg2)
```
 If there's nothing to line it up to that makes sense, move it to then next line and indent by four spaces so it is obvious that it is not part of that indention level. e.g.
```
PDFJS.long =
    function superLong()
```