{"action":"closed","issue":{"url":"https://api.github.com/repos/slackapi/node-slack-sdk/issues/492","repository_url":"https://api.github.com/repos/slackapi/node-slack-sdk","labels_url":"https://api.github.com/repos/slackapi/node-slack-sdk/issues/492/labels{/name}","comments_url":"https://api.github.com/repos/slackapi/node-slack-sdk/issues/492/comments","events_url":"https://api.github.com/repos/slackapi/node-slack-sdk/issues/492/events","html_url":"https://github.com/slackapi/node-slack-sdk/issues/492","id":304565922,"number":492,"title":"v4.0.0 - IncomingWebhook errors with a TypeError","user":{"login":"dustingraves","id":6600627,"avatar_url":"https://avatars2.githubusercontent.com/u/6600627?v=4","gravatar_id":"","url":"https://api.github.com/users/dustingraves","html_url":"https://github.com/dustingraves","followers_url":"https://api.github.com/users/dustingraves/followers","following_url":"https://api.github.com/users/dustingraves/following{/other_user}","gists_url":"https://api.github.com/users/dustingraves/gists{/gist_id}","starred_url":"https://api.github.com/users/dustingraves/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dustingraves/subscriptions","organizations_url":"https://api.github.com/users/dustingraves/orgs","repos_url":"https://api.github.com/users/dustingraves/repos","events_url":"https://api.github.com/users/dustingraves/events{/privacy}","received_events_url":"https://api.github.com/users/dustingraves/received_events","type":"User","site_admin":false},"labels":[{"id":88295219,"url":"https://api.github.com/repos/slackapi/node-slack-sdk/labels/bug","name":"bug","color":"ee0701","default":true}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2018-03-12T22:38:51Z","updated_at":"2018-03-12T22:47:02Z","closed_at":"2018-03-12T22:47:02Z","author_association":"NONE","body":"### Description\r\n\r\n`IncomingWebhook` errors with a `TypeError: util_1.callbackify is not a function`\r\n\r\n### What type of issue is this? (place an `x` in one of the `[ ]`)\r\n- [x] bug\r\n- [ ] enhancement (feature request)\r\n- [ ] question\r\n- [ ] documentation related\r\n- [ ] testing related\r\n- [ ] discussion\r\n\r\n### Requirements (place an `x` in each of the `[ ]`)\r\n* [x] I've read and understood the [Contributing guidelines](https://github.com/slackapi/node-slack-sdk/blob/master/.github/contributing.md) and have done my best effort to follow them.\r\n* [x] I've read and agree to the [Code of Conduct](https://slackhq.github.io/code-of-conduct).\r\n* [x] I've searched for any related issues and avoided creating a duplicate issue.\r\n\r\n---\r\n\r\n### Bug Report\r\n\r\nFilling out the following details about bugs will help us solve your issue sooner.\r\n\r\n#### Reproducible in:\r\n\r\n`@slack/client` version: 4.0.0\r\n\r\nnode version: 6.10.0\r\n\r\nOS version(s): OS X 10.13.1\r\n\r\n#### Steps to reproduce:\r\n\r\n2. Initiate a new webhook process\r\n3. try to send a message via webhook\r\n\r\n#### Expected result:\r\n\r\nIt should work\r\n\r\n#### Actual result:\r\n\r\nThrows a TypeError\r\n\r\n#### Attachments:\r\n\r\n```shell\r\nTypeError: util_1.callbackify is not a function\r\n    at IncomingWebhook.send (project/node_modules/@slack/client/dist/IncomingWebhook.js:38:16)\r\n    at slackWebhookResponse (project/src/lib/utils.js:84:13)\r\n    at wrapper (project/node_modules/lodash/lodash.js:5205:19)\r\n    at process._tickDomainCallback (internal/process/next_tick.js:129:7)\r\n```\r\n"}}
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