GROQ-hook projection example for Slack Block Kit

groqHookToSlack.groq

{
  "blocks": [
    {
      "type": "header",
      "text": {
        "type": "plain_text",
        "text": coalesce(title, "Untitled article"),
        "emoji": true
      }
    },
    ...body[] {
      _type == "block" => {
        "type": "section",
        "text": {
          "type": "plain_text",
          "text": pt::text(@),
          "emoji": true
        }
      },
      _type == "image" => {
        "type": "image",
        "title": {
          "type": "plain_text",
          "text": coalesce(caption, alt, asset->originalFilename, "-"),
          "emoji": true
        },
        "image_url": asset->url,
        "alt_text": coalesce(alt, '')
      }
    }
  ]
}