JavaScript var vs. Groovy def

I keep typing the following:

var blogger = new Blogger()

when I should be saying

def blogger = new Blogger()

def is used to define new methods and variables. The problem is that the JavaScript syntax compiles ... it just doesn't execute. I looks like a call to method var().

The code fails at runtime with groovy.lang.MissingPropertyException: "No such property: blogger for class: com.nfjs.hls.blog.pages.Login".

Just takes a little getting used to. Perhaps this is where polyglot programming breaks down a little ... switching between too similar languages.