Create an incoming webhook for your Slack server and replace https://hooks.slack.com/put-your-stuff-here in app.json with your webhook url -- or remove the expo-postpublish-slack-notify hook entirely from app.json.

Running the app

cd into the app directory and run yarn or npm install
Open app with exp or XDE, try it out.

The idea behind the example

It's common to need to perform a set of tasks once you publish an update to your project. For example, you may want to notify people on Twitter or Slack, upload sourcemaps and cut a release on Sentry, etc. This example demonstrates how you can write your own simple hooks with ./hooks/echo.js, and install and use hooks distributed through npm, such as expo-prepublish-slack-notify.