I\'ve been working with KoaJS for a while, and we can easily use the \'let\' keyword and the generators when using the --harmony flag but I couldn\'t find how much support for
This does not concern node 0.11, but in the current 5.8.0, you can use --harmony_default_parameter.
--harmony_default_parameter
It it scheduled to be included by default in v6.0.