Message Metadata

/**
 * Application-specific data to attach to Slack message.
 * @see https://docs.slack.dev/messaging/message-metadata
 */
interface MessageMetadata {
  /** Human readable alphanumeric string representing your application's metadata event */
  event_type: string;
  /** Free-form object containing whatever data your application wishes to attach */
  event_payload: {
    [key: string]: string | number | boolean | MessageMetadataEventPayloadObject | MessageMetadataEventPayloadObject[];
  };
}

interface MessageMetadataEventPayloadObject {
  [key: string]: string | number | boolean;
}

import { MessageMetadata } from "@slack/types";

// Task management metadata
const taskMetadata: MessageMetadata = {
  event_type: "task_created",
  event_payload: {
    task_id: "task_12345",
    priority: "high",
    assignee: "U123456789",
    due_date: "2024-01-15",
    completed: false,
    tags: ["urgent", "backend"]
  }
};

// Survey metadata
const surveyMetadata: MessageMetadata = {
  event_type: "survey_response",
  event_payload: {
    survey_id: "survey_67890",
    response_count: 5,
    average_rating: 4.2,
    questions: [
      { question_id: "q1", response: "Very satisfied" },
      { question_id: "q2", response: "Would recommend" }
    ]
  }
};

// Using with message posting
const message = {
  channel: "C1234567890",
  text: "New task has been created",
  metadata: taskMetadata
};

// Message events with metadata
interface MessageEvent {
  type: 'message';
  channel: string;
  user: string;
  text: string;
  ts: string;
  metadata?: MessageMetadata;
}