flonted의 오류를 알리고 싶습니다

const { IncomingWebhook } = require('@slack/webhook')
// Webhook url
const url = 'https://hooks.slack.com/xxxxx'
const webhook = new IncomingWebhook(url)

exports.handler = async (event) => {
  const sentryBodyStr = event.body
  const sentryBody = JSON.parse(sentryBodyStr)
  const sentryEvent = sentryBody.event
  
  // ブラウザ情報
  const browserInfo = (() => {
    const browser = sentryEvent.contexts.browser
    if (browser === undefined) return 'unknown'
    return `${browser.name} ${browser.type} ${browser.version}`
  })()
  
  // OS情報
  const osInfo = (() => {
    const os = sentryEvent.contexts.os
    if (os === undefined) return 'unknown'
    return `${os.name} ${os.type} ${os.version}`
  })()
  
  // デバイス情報
  const deviceInfo = (() => {
    const device = sentryEvent.contexts.device
    if (device === undefined) return 'unknown'
    return `${device.family}`
  })()
  
  // エラー名
  const title = sentryEvent.title
  
  // Sentryのissue URL
  const url = sentryBody.url
  
  // 環境
  const env = sentryEvent.environment

  const issue = {
    message: title,
    detail: url,
    browser: browserInfo,
    os: osInfo,
    device: deviceInfo
  }
  const issueProperties = Object.entries(issue).map(entry => { return `${entry[0]}: ${entry[1]}` })

  const payload = {
    "blocks": [
      {
	"type": "section",
	"text": {
	  "type": "mrkdwn",
	  "text": `:ghost: *${env}* でエラーがおきたよ`
	}
      },
      {
	"type": "section",
	"text": {
	  "type": "mrkdwn",
	  "text": issueProperties.join('\n')
	}
      },
    ]
  }
  await webhook.send(payload)
}