title: Discord bot not starting with heroku
body: <p>So i have hosted my bot on heroku for some time now, and it worked just fine, but i recently moved, temporarly, to self hosting again cause i had to update to discord.js v13, but now i'm done with the changes, and i tried to re-host the bot on heroku, but it gives this error:</p>
  <pre><code>(node:4) UnhandledPromiseRejectionWarning: ReferenceError: AbortController is not defined
  
  2021-08-08T20:30:17.770796+00:00 app[Worker.1]:     at RequestHandler.execute (/app/node_modules/discord.js/src/rest/RequestHandler.js:172:15)
  
  2021-08-08T20:30:17.770796+00:00 app[Worker.1]:     at RequestHandler.execute (/app/node_modules/discord.js/src/rest/RequestHandler.js:176:19)
  
  2021-08-08T20:30:17.770797+00:00 app[Worker.1]:     at RequestHandler.push (/app/node_modules/discord.js/src/rest/RequestHandler.js:50:25)
  
  2021-08-08T20:30:17.770797+00:00 app[Worker.1]:     at processTicksAndRejections (internal/process/task_queues.js:95:5)
  
  2021-08-08T20:30:17.770798+00:00 app[Worker.1]:     at async WebSocketManager.connect (/app/node_modules/discord.js/src/client/websocket/WebSocketManager.js:128:9)
  
  2021-08-08T20:30:17.770798+00:00 app[Worker.1]:     at async Client.login (/app/node_modules/discord.js/src/client/Client.js:245:7)
  
  2021-08-08T20:30:17.770799+00:00 app[Worker.1]: (Use `node --trace-warnings ...` to show where the warning was created)
  
  2021-08-08T20:30:17.770962+00:00 app[Worker.1]: (node:4) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
  
  2021-08-08T20:30:17.771045+00:00 app[Worker.1]: (node:4) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
  </code></pre>
  <p>I don't understand what is happening, the only change that i think could cause this is the fact that i made an event handler and i now put events in their own files like commands, but i'm not sure if that has something to do with this error, i really hope you can help.</p>