docs: function Command(command, options) {
    var previousPath;
  
    this.command = command;
  
    // We're on Windows if `process.platform` starts with "win", i.e. "win32".
    this.isWindows = (process.platform.lastIndexOf('win') === 0);
  
    // the cwd and environment of the command are the same as the main node
    // process by default.
    this.options = defaults(options || {}, {
      cwd: process.cwd(),
      env: process.env,
      verbosity: (options && options.silent) ? 1 : 2,
      usePowerShell: false
    });
  
    // include node_modules/.bin on the path when we execute the command.
    previousPath = this.options.env.PATH;
    this.options.env.PATH = path.join(this.options.cwd, 'node_modules', '.bin');
    this.options.env.PATH += path.delimiter;
    this.options.env.PATH += previousPath;
  }