code: function (glob, opts) {
      if (opts.ignore) {
        this.map('exclude', opts.ignore, opts);
      }
      if (opts.exclude) {
        this.map('exclude', opts.exclude, opts);
      }
      if (opts.include) {
        this.map('include', opts.include, opts);
      }
  
      // if not disabled by the user, run the built-ins
      if (!this.disabled('builtins')) {
        if (!this.disabled('npm')) {
          this.use(npm(opts));
        }
        if (!this.disabled('dotfiles')) {
          this.use(dotfiles()(opts));
        }
        if (!this.disabled('gitignore')) {
          this.use(gitignore()(opts));
        }
      }
    }
docs: Set configuration defaults.