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Re:Meteor releases authentication, accounts system, and new ... by Derander on Wednesday October 17, 2012 @07:28PM (#4666866)
From the linked page:

  client function client_function(x, y) { ... }
This seems at least slightly different from "pure javascript". There are more examples on the page, particularly the neat sugar for database stuff.

I don't think it's accurate to say that this is an outright lie.

Re:Meteor releases authentication, accounts system, and new ... by hbbio on Wednesday October 17, 2012 @07:42PM (#4666898)
Opa generates pure JS code, even though it's indeed a variant of JavaScript with some added features (the ones you mention) and some removed. But then, there's also Derby and probably others.