       version()
     when '-b', '--bare'
       opts.bare = true
+    when '-d', '--dedupe'
+      opts.dedupe = true
     when '-x', '--exclude'
       opts.exclude = new RegExp args.shift()
     when '-e', '--export'


opts =
  bare:    false
  exclude: null
  export:  null
  files:   []

    -e, --export <name>          export module as <name>
    -i, --include [module, ...]  additional modules to include, in <require as>:<path to module> format
    -m, --minify                 minify output
    -o, --output <file>          write bundle to file instead of stdout, {} may be used as a placeholder.
    -p, --prelude <file>         file to use as prelude
        --no-prelude             exclude prelude from bundle
    -s, --strict                 add "use strict" to each bundled module.
