Slack Customization

slack-customization.js

/**
 * Append the following to /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static/ssb-interop.js
 * Replace url with your own, or point to this url to responsively hide sidebar: 
 * https://gist.githubusercontent.com/rissajeanne/dc10be6272d223b778307dcd1d0028d9/raw/a6afd5fdac45e6b839da95c314acb3d8c7619553/slack-hide-sidebar.css
 * Lastly, close and restart Slack
 *
 * Source: https://github.com/laCour/slack-night-mode/issues/73#issuecomment-287467332
 */

// Hides Slack sidebar if window is 720px or narrower
document.addEventListener('DOMContentLoaded', function() {
 $.ajax({
   url: 'https://gist.githubusercontent.com/rissajeanne/dc10be6272d223b778307dcd1d0028d9/raw/a6afd5fdac45e6b839da95c314acb3d8c7619553/slack-hide-sidebar.css',
   success: function(css) {
     $("<style></style>").appendTo('head').html(css);
   }
 });
});