PyCharm also has excellent JavaScript support: http://www.jetbrains.com/editors/javascript_editor.jsp?ide=p... This, the IDE's cross platform support and the IdeaVIM plugin have basically converted me back to an IDE toting developer again.
I think having good HTML/JS/CSS support is a general trait of all of the JetBrains IDEs, in case you are curious if the one for your language has it too.
(and the sass syntax highlighting was also a 'ooh!', as was the automagical git support, as was JetBrains' helpful personal email reply to my filled in questionnaire, as was... well, you get the idea. I'm a happy customer!)