import { WebClient } from 'https://deno.land/x/[email protected]/mod.ts';

  import * as wmill from 'https://deno.land/x/[email protected]/mod.ts';

  type Slack = {

      token: string;

  };

  export async function main(

      response_url: string,

      text: string,

      channel_id?: string,

      command?: string

  ) {

      if (command === "@mention") {

          // @mention - use Slack API

          const slack = await wmill.getResource<Slack>('f/slack_bot/bot_token');

          const web = new WebClient(slack.token);

          await web.chat.postMessage({

              channel: channel_id,

              text: `Echo: ${text}`

          });

      } else {

          // Slash command - use response_url

          await fetch(response_url, {

              method: 'POST',

              body: JSON.stringify({ text: `Echo: ${text}` })

          });

      }

  }