It adds a path to the list of places where the js compiler would look for javascript files.

To construct that path it depends on "sourceDir in Compile" which probably is app/ and then appends "vendor/myjslibrary/js" to that and then says that it should match every js-file under that directory, so any file matching "*.js" under "app/vendor/myjslibrary/js/" and its subdirectories.

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