Slack message module using the incoming webhook API.

slack.js

;(function () {
  'use strict'

  /*
   Slack message module using the incoming webhook API.
   https://api.slack.com/incoming-webhooks
   https://api.slack.com/docs/formatting
   */

  module.exports = Slack

  const https = require('https')
  const querystring = require('querystring')

  Slack.prototype.post = m => {
    return new Promise((res, rej) => {
      const payload = JSON.stringify({
        'channel': '#some-channel',
        'username': 'some-user',
        'text': `@channel: ${m}`,
        'icon_emoji': ':robot_face:',
        'link_names': 1
      })
      const data = querystring.stringify({ payload: payload })
      const post = https.request({
        hostname: 'hooks.slack.com',
        path: '/services/XXXXXXXXX/YYYYYYYYY/ZZZZZZZZZZZZZZZZZZZZZZZZ',
        port: 443,
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          'Content-Length': Buffer.byteLength(data)
        }
      }, r => res())
      post.on('error', e => rej())
      post.write(data)
      post.end()
    })
  }

  function Slack () {}
}())

Basic usage:

const Slack = require('./../slack')
const slack = Object.create(Slack.prototype)

yield slack.post('Hello world!')
// Do other stuff.