code: function getCli (definitions, usageSections, argv) {
    const commandLineArgs = require('command-line-args')
    const commandLineUsage = require('command-line-usage')
    const usage = usageSections ? commandLineUsage(usageSections) : ''
    const options = commandLineArgs(definitions, argv)
    return { options, usage }
  }
docs: Parse the command-line options.
  @param definitions {OptionDefinitions[]} - to be passed to command-line-args
  @param [usageSections] {section[]} - to be passed to command-line-usage
  @param [argv] {string[]} - If supplied, this `argv` array is parsed instead of `process.argv`.
  @returns {object}
  @static