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JSLint is a Javascript code quality tool created by Douglas Crockford, Javascript hardcore developer. This tool helps you know what parts of your code you need to change in order to have a better sane code. Until now, you could only do it online, but with this plugin you can do it directly on ST2. If you are serious about Javascript you need this.
Specs
Pros
Pro Finds syntactical errors
Any code base eventually becomes huge at some point, and simple mistakes—that would not show themselves when written—can become show stoppers and waste hours of debugging. And this is when static code analysis tools come into play and help developers to spot such problems. JSHint scans a program written in JavaScript and reports about commonly made mistakes and potential bugs. The potential problem could be a syntax error, a bug due to implicit type conversion, a leaking variable or something else.