Javascript & html compiler

[PeterR]

I want to sanity check Javascript, html and css during the application build. I am presently locked onto GNU Legacy build (mingw32) on Windows.

Are there any Javascript, html compilers for the mingw32 environment?
Normally I would use closure but failed at first attempt to get Java to run.
Ran the MinGW installation manager:

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install: gcc-v3-java-3.4.5-20060117-3-mingw32-bin.tar.gz
 installing gcc-v3-java-3.4.5-20060117-3-mingw32-bin.tar.gz
mingw-get-gui: *** ERROR *** C:\MinGW\/info/gccint.info: extraction failed
mingw-get-gui: *** ERROR *** C:\MinGW\/info/gccint.info: probable package conflict; existing file not overwritten

Ends up with:

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$ gcc compiler.jar
gcc: error: compiler.jar: Java compiler not installed on this system

So looking either for a method of getting Java to run from within minGW32 OR another Javascript compiler.