code: function parseWatch (args, parsed) {
    let arg = args[0];
  
    if (arg === "-w" || arg === "--watch") {
      args.shift();
      parsed.cmd = "watchify";
      return true;
    }
  }
docs: If the current argument is the --watch argument,
  then this function sets {@link ParsedArgs#cmd} to "watchify".
  
  @param {string[]} args - The command-line arguments that have not yet been parsed
  @param {ParsedArgs} parsed - The command-line arguments that have already been parsed
  @returns {boolean}