How to use the @vuepress/shared-utils.chalk.gray function in @vuepress/shared-utils

const createServerConfig = require('./webpack/createServerConfig')
  const { createBundleRenderer } = require('vue-server-renderer')
  const { normalizeHeadTag, applyUserWebpackConfig } = require('./util/index')

  logger.wait('\nExtracting site metadata...')
  const options = await prepare(sourceDir, cliOptions, true /* isProd */)
  if (cliOptions.outDir) {
    options.outDir = cliOptions.outDir
  }

  const { outDir } = options
  if (process.cwd() === outDir) {
    return console.error(logger.error(chalk.red('Unexpected option: outDir cannot be set to the current working directory.\n'), false))
  }
  await fs.remove(outDir)
  logger.debug('Dist directory: ' + chalk.gray(require('path').resolve(process.cwd(), outDir)))

  let clientConfig = createClientConfig(options, cliOptions).toConfig()
  let serverConfig = createServerConfig(options, cliOptions).toConfig()

  // apply user config...
  const userConfig = options.siteConfig.configureWebpack
  if (userConfig) {
    clientConfig = applyUserWebpackConfig(userConfig, clientConfig, false)
    serverConfig = applyUserWebpackConfig(userConfig, serverConfig, true)
  }

  // compile!
  const stats = await compile([clientConfig, serverConfig])

  const serverBundle = require(path.resolve(outDir, 'manifest/server.json'))
  const clientManifest = require(path.resolve(outDir, 'manifest/client.json'))

if (hasDefaultExport(content)) {
            destPath = await writeEnhancer(
              moduleId++,
              `export { default } from ${JSON.stringify(enhanceAppFile)}`
            )
          } else {
            destPath = await writeEnhancer(
              moduleId++,
              `import ${JSON.stringify(enhanceAppFile)}`,
              false /* do not contain default export*/
            )
          }
        } else {
          logger.developer(
            chalk.gray(`[${pluginName}] `) +
            `${chalk.cyan(enhanceAppFile)} Not Found.`
          )
        }
      }

      if (destPath) {
        manifest.push(destPath)
      }
    }

    // 2. write entry file.
    await ctx.writeTemp('internal/app-enhancers.js', pathsToModuleCode(manifest))
  }
}

compiler.hooks.done.tap('vuepress-log', stats => {
      if (shouldClearScreen) {
        clearScreen()
      }

      const time = new Date().toTimeString().match(/^[\d:]+/)[0]
      const displayUrl = `http://${displayHost}:${port}${publicPath}`

      logger.success(
        `${chalk.gray(`[${time}]`)} Build ${chalk.italic(stats.hash.slice(0, 6))} `
        + `finished in ${stats.endTime - stats.startTime} ms! `
        + (
          isFirst
            ? ''
            : `${chalk.gray(`(${displayUrl})`)}`
        )
      )
      if (isFirst) {
        isFirst = false
        console.log(`${chalk.gray('>')} VuePress dev server listening at ${chalk.cyan(displayUrl)}`)
        const { duration } = performance.stop()
        logger.developer(`It took a total of ${chalk.cyan(`${duration}ms`)} to run the ${chalk.cyan('vuepress dev')} for the first time.`)
      }
    })
    if (shouldClearScreen) {

siteAgreement: 'templates/dev.html',
        themeAgreement: 'templates/dev.html'
      }
    )

    this.ssrTemplate = this.resolveCommonAgreementFilePath(
      'ssrTemplate',
      {
        defaultValue: this.getLibFilePath('client/index.ssr.html'),
        siteAgreement: 'templates/ssr.html',
        themeAgreement: 'templates/ssr.html'
      }
    )

    logger.debug('SSR Template File: ' + chalk.gray(this.ssrTemplate))
    logger.debug('DEV Template File: ' + chalk.gray(this.devTemplate))
  }

this._pluginQueue.forEach(plugin => {
      if (plugin.enabled) {
        this.applyPlugin(plugin)
      } else {
        logger.debug(`${chalk.gray(`[${plugin.name}]`)} disabled.`)
      }
    })
  }

defaultValue: this.getLibFilePath('client/index.dev.html'),
        siteAgreement: 'templates/dev.html',
        themeAgreement: 'templates/dev.html'
      }
    )

    this.ssrTemplate = this.resolveCommonAgreementFilePath(
      'ssrTemplate',
      {
        defaultValue: this.getLibFilePath('client/index.ssr.html'),
        siteAgreement: 'templates/ssr.html',
        themeAgreement: 'templates/ssr.html'
      }
    )

    logger.debug('SSR Template File: ' + chalk.gray(this.ssrTemplate))
    logger.debug('DEV Template File: ' + chalk.gray(this.devTemplate))
  }