How to use the @nuxt/utils.guardDir function in @nuxt/utils

// Default value for _nuxtConfigFile
  if (!options._nuxtConfigFile) {
    options._nuxtConfigFile = path.resolve(options.rootDir, `${defaultNuxtConfigFile}.js`)
  }

  if (!options._nuxtConfigFiles) {
    options._nuxtConfigFiles = [
      options._nuxtConfigFile
    ]
  }

  // Watch for config file changes
  options.watch.push(...options._nuxtConfigFiles)

  // Protect rootDir against buildDir
  guardDir(options, 'rootDir', 'buildDir')

  if (hasGenerateDir) {
    // Resolve generate.dir
    options.generate.dir = path.resolve(options.rootDir, options.generate.dir)

    // Protect rootDir against buildDir
    guardDir(options, 'rootDir', 'generate.dir')
  }

  if (hasSrcDir) {
    // Protect srcDir against buildDir
    guardDir(options, 'srcDir', 'buildDir')

    if (hasGenerateDir) {
      // Protect srcDir against generate.dir
      guardDir(options, 'srcDir', 'generate.dir')

if (hasGenerateDir) {
    // Resolve generate.dir
    options.generate.dir = path.resolve(options.rootDir, options.generate.dir)

    // Protect rootDir against buildDir
    guardDir(options, 'rootDir', 'generate.dir')
  }

  if (hasSrcDir) {
    // Protect srcDir against buildDir
    guardDir(options, 'srcDir', 'buildDir')

    if (hasGenerateDir) {
      // Protect srcDir against generate.dir
      guardDir(options, 'srcDir', 'generate.dir')
    }
  }

  // Populate modulesDir
  options.modulesDir = uniq(
    getMainModule().paths.concat(
      [].concat(options.modulesDir).map(dir => path.resolve(options.rootDir, dir))
    )
  )

  const mandatoryExtensions = ['js', 'mjs']

  options.extensions = mandatoryExtensions
    .filter(ext => !options.extensions.includes(ext))
    .concat(options.extensions)

options._nuxtConfigFile
    ]
  }

  // Watch for config file changes
  options.watch.push(...options._nuxtConfigFiles)

  // Protect rootDir against buildDir
  guardDir(options, 'rootDir', 'buildDir')

  if (hasGenerateDir) {
    // Resolve generate.dir
    options.generate.dir = path.resolve(options.rootDir, options.generate.dir)

    // Protect rootDir against buildDir
    guardDir(options, 'rootDir', 'generate.dir')
  }

  if (hasSrcDir) {
    // Protect srcDir against buildDir
    guardDir(options, 'srcDir', 'buildDir')

    if (hasGenerateDir) {
      // Protect srcDir against generate.dir
      guardDir(options, 'srcDir', 'generate.dir')
    }
  }

  // Populate modulesDir
  options.modulesDir = uniq(
    getMainModule().paths.concat(
      [].concat(options.modulesDir).map(dir => path.resolve(options.rootDir, dir))

options.watch.push(...options._nuxtConfigFiles)

  // Protect rootDir against buildDir
  guardDir(options, 'rootDir', 'buildDir')

  if (hasGenerateDir) {
    // Resolve generate.dir
    options.generate.dir = path.resolve(options.rootDir, options.generate.dir)

    // Protect rootDir against buildDir
    guardDir(options, 'rootDir', 'generate.dir')
  }

  if (hasSrcDir) {
    // Protect srcDir against buildDir
    guardDir(options, 'srcDir', 'buildDir')

    if (hasGenerateDir) {
      // Protect srcDir against generate.dir
      guardDir(options, 'srcDir', 'generate.dir')
    }
  }

  // Populate modulesDir
  options.modulesDir = uniq(
    getMainModule().paths.concat(
      [].concat(options.modulesDir).map(dir => path.resolve(options.rootDir, dir))
    )
  )

  const mandatoryExtensions = ['js', 'mjs']