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I've found that uglifyjs does about as good a job as Closure Compiler, but waaay faster. Could be a nice speed up in deploy times for you.

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closure kicks uglify for size when compiling with advanced optimisations.

I found that the advanced optimisations broke our Javascript when I compared the two a couple of years back. We weren't interested in rewriting our Javascript to make it compatible with the Closure.

The thing that will break your code is this type of notation this['function'] since the compiler can have no idea what renaming should apply. There are aspects of the library that lets you expose public apis.

I can really recommend the compiler in AO mode, the type saving is insane (75% reduction in file size) and type checking is sweet

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