How to use the @oclif/parser/lib/flags.boolean function in @oclif/parser

char: 'p',
      description: 'Type of Kubernetes platform. Valid values are \"minikube\", \"minishift\", \"k8s (for kubernetes)\", \"openshift\", \"crc (for CodeReady Containers)\", \"microk8s\".',
      options: ['minikube', 'minishift', 'k8s', 'openshift', 'microk8s', 'docker-desktop', 'crc'],
    }),
    chenamespace: cheNamespace,
    templates: string({
      char: 't',
      description: 'Path to the templates folder',
      default: Update.getTemplatesDir(),
      env: 'CHE_TEMPLATES_FOLDER'
    }),
    'che-operator-image': string({
      description: 'Container image of the operator. This parameter is used only when the installer is the operator',
      default: DEFAULT_CHE_OPERATOR_IMAGE
    }),
    'skip-version-check': boolean({
      description: 'Skip user confirmation on version check',
      default: false
    }),
    'deployment-name': cheDeployment,
    'listr-renderer': listrRenderer,
    help: flags.help({ char: 'h' }),
  }

  static getTemplatesDir(): string {
    // return local templates folder if present
    const TEMPLATES = 'templates'
    const templatesDir = path.resolve(TEMPLATES)
    const exists = fs.pathExistsSync(templatesDir)
    if (exists) {
      return TEMPLATES
    }