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-js-root                       Tells ExternC to generate JS instead of AS and place it in the specified folder
-as-root                       Tells ExternC to generate AS and place it in the specified folder
-class-to-function             Name of JS classes to output as a Function
-external                      Files of externs
-external-externs              Not sure what this is forexterns              Similar to -external-library-path for externs. Basically, a way to specify some types that are needed at compile time without including them in the final output.
-exclude (class, name)         Name of method in class to skip
-field-exclude (class, field)  Name of var in class to skip
-class-exclude (class)         Name of class to skip
-named-module                  Not sure about this one either.

About js-root:

ExternC parses most JS, including some JS not already formatted as GCC Externs.  Normally it outputs AS.  But sometimes we want it to output true GCC Externs because otherwise GCC will complain.  Eventually, ExternC could parse any JS and be used to generate Externs.