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

}

  if (typeof options.layoutTransition === 'string') {
    options.layoutTransition = { name: options.layoutTransition }
  }

  if (typeof options.extensions === 'string') {
    options.extensions = [options.extensions]
  }

  options.globalName = (isNonEmptyString(options.globalName) && /^[a-zA-Z]+$/.test(options.globalName))
    ? options.globalName.toLowerCase()
    : `nuxt`

  // Resolve rootDir
  options.rootDir = isNonEmptyString(options.rootDir) ? path.resolve(options.rootDir) : process.cwd()

  // Apply defaults by ${buildDir}/dist/build.config.js
  // TODO: Unsafe operation.
  // const buildDir = options.buildDir || defaults.buildDir
  // const buildConfig = resolve(options.rootDir, buildDir, 'build.config.js')
  // if (existsSync(buildConfig)) {
  //   defaultsDeep(options, require(buildConfig))
  // }

  // Apply defaults
  const nuxtConfig = getDefaultNuxtConfig()

  nuxtConfig.build._publicPath = nuxtConfig.build.publicPath

  // Fall back to default if publicPath is falsy
  if (options.build && !options.build.publicPath) {

nuxtConfig.build._publicPath = nuxtConfig.build.publicPath

  // Fall back to default if publicPath is falsy
  if (options.build && !options.build.publicPath) {
    options.build.publicPath = undefined
  }

  defaultsDeep(options, nuxtConfig)

  // Sanitize router.base
  if (!/\/$/.test(options.router.base)) {
    options.router.base += '/'
  }

  // Check srcDir and generate.dir existence
  const hasSrcDir = isNonEmptyString(options.srcDir)
  const hasGenerateDir = isNonEmptyString(options.generate.dir)

  // Resolve srcDir
  options.srcDir = hasSrcDir
    ? path.resolve(options.rootDir, options.srcDir)
    : options.rootDir

  // Resolve buildDir
  options.buildDir = path.resolve(options.rootDir, options.buildDir)

  // Aliases
  const { rootDir, srcDir, dir: { assets: assetsDir, static: staticDir } } = options
  options.alias = {
    '~~': rootDir,
    '@@': rootDir,
    '~': srcDir,

delete options.transition
  }

  if (typeof options.pageTransition === 'string') {
    options.pageTransition = { name: options.pageTransition }
  }

  if (typeof options.layoutTransition === 'string') {
    options.layoutTransition = { name: options.layoutTransition }
  }

  if (typeof options.extensions === 'string') {
    options.extensions = [options.extensions]
  }

  options.globalName = (isNonEmptyString(options.globalName) && /^[a-zA-Z]+$/.test(options.globalName))
    ? options.globalName.toLowerCase()
    : `nuxt`

  // Resolve rootDir
  options.rootDir = isNonEmptyString(options.rootDir) ? path.resolve(options.rootDir) : process.cwd()

  // Apply defaults by ${buildDir}/dist/build.config.js
  // TODO: Unsafe operation.
  // const buildDir = options.buildDir || defaults.buildDir
  // const buildConfig = resolve(options.rootDir, buildDir, 'build.config.js')
  // if (existsSync(buildConfig)) {
  //   defaultsDeep(options, require(buildConfig))
  // }

  // Apply defaults
  const nuxtConfig = getDefaultNuxtConfig()

// Fall back to default if publicPath is falsy
  if (options.build && !options.build.publicPath) {
    options.build.publicPath = undefined
  }

  defaultsDeep(options, nuxtConfig)

  // Sanitize router.base
  if (!/\/$/.test(options.router.base)) {
    options.router.base += '/'
  }

  // Check srcDir and generate.dir existence
  const hasSrcDir = isNonEmptyString(options.srcDir)
  const hasGenerateDir = isNonEmptyString(options.generate.dir)

  // Resolve srcDir
  options.srcDir = hasSrcDir
    ? path.resolve(options.rootDir, options.srcDir)
    : options.rootDir

  // Resolve buildDir
  options.buildDir = path.resolve(options.rootDir, options.buildDir)

  // Aliases
  const { rootDir, srcDir, dir: { assets: assetsDir, static: staticDir } } = options
  options.alias = {
    '~~': rootDir,
    '@@': rootDir,
    '~': srcDir,
    '@': srcDir,