I've implemented a first pass at this feature (partial parsing), it's currently in beta.. to accept unknown options you now pass { partial: true } to the commandLineArgs function.. this is the new method sig (documentation still WIP).

so, to use your example, if we had this script...

const commandLineArgs = require('command-line-args')

const definitions = [
  { name: 'foo', type: String },
  { name: 'verbose', alias: 'v', type: Boolean },
  { name: 'libs', type: String, defaultOption: true }
]

const options = commandLineArgs(definitions, { partial: true })
console.log(options)

... and we installed it as mywrapper, then running this command:

$ mywrapper --foo bar -v libfn --libarg val1 -r

... would output this:

{ foo: 'bar',
  verbose: true,
  libs: 'libfn',
  _unknown: [ '--libarg', 'val1', '-r' ] }

The big changes here are that the script no longer throws with UNKNOWN_OPTION and returns the unknown args in the _unknown property.

Please install the beta and let me know what else needs to happen:

$ npm install command-line-args@^4.0.0-0

I'm considering making partial: true the default mode, not sure yet.

Allow for unknown options #25

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