Best javascript compressor/compiler/obfuscator?

Question

Duplicate:

• Are there any Javascript static analysis tools?
• Which javascript minification library produces better results?
• Best javascript compressor
• How can I obfuscate JavaScript?
• What is the best javascript obfuscator?
• others (just search SO)

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They should perform the following functionalities: - checking for errors - optimize the code - removing unused code - packaging management - compress it (rename varialbe and property name to shorter ones) - obfuscate it (sometime it is the same as compress it.

Answer 1

I have to say Yahoo's YUI Compressor. I have used it for a while now and really like it. Of course once I found one I liked I stopped looking.

javaflight is also worth checking out, its an ant task for the YUI Compressor.