According to JS style guide, you need to return back to the indentation level you left before the continuation. Existing indentation may look weird, but it's correct. Example from style guide:

~~~ js
// Four-space, wrap at 80.  Works with very long function names, survives
// renaming without reindenting, low on space.
goog.foo.bar.doThingThatIsVeryDifficultToExplain = function(
    veryDescriptiveArgumentNumberOne, veryDescriptiveArgumentTwo,
    tableModelEventHandlerProxy, artichokeDescriptorAdapterIterator) {
  // ... (2 spaces again)
};
~~~