`slash-up sync` hangs forever during Heroku deployment

[linuswillner]

Déja vù, I'm here again with mystic hanging issues.

As titled, slash-up sync does nothing for at least 40 minutes (didn't bother waiting any longer) when trying to deploy to Heroku. I have positive confirmation that the command is started by NPM, but after that, nothing happens. Adding the --debug flag still prints nothing. Tried updating to latest slash-up and slash-create, neither had any effect.

We last deployed successfully with [email protected] and [email protected] on October 10th. This breakage has therefore happened somewhere between then and now. I will try again tomorrow to rule out Discord platform issues.

The only clue I have to go on at this stage is that the sync command never gets as far https://github.com/Snazzah/slash-up/blob/master/src/commands/sync.ts#L134, since I tried adding beforeSync: 'block' to the config, but still nothing would happen. It seems reasonable to assume it never makes it as far as https://github.com/Snazzah/slash-up/blob/master/src/commands/sync.ts#L126 either. I have a non-zero amount of commands, and it not stopping on "no commands" seems to suggest it doesn't make it as far as https://github.com/Snazzah/slash-up/blob/master/src/commands/sync.ts#L116 either. I have neither disableDelete nor globalToGuild enabled in the production environment (latter is enabled in dev, but I'm running slash-up sync, which should mean it does not go into that branch), so it therefore stands to reason the script never enters neither https://github.com/Snazzah/slash-up/blob/master/src/commands/sync.ts#L108 nor https://github.com/Snazzah/slash-up/blob/master/src/commands/sync.ts#L99.

Summarily, bar the handler() function not running at all, it seems the script is liable to hang somewhere here: https://github.com/Snazzah/slash-up/blob/master/src/commands/sync.ts#L95-L96

The strangest thing is that this works just fine locally.

That's all I've got to go on at this stage; happy to provide more help where I can. Thank you in advance for any help!