I wrote a Telegram bot using TelegrafJS, this framework wraps the Telegram API. The problem that I’m facing is how to correctly manage the unhandled rejection, in fact when I call this method:
await ctx.deleteMessage(message_id);
where ctx is the instance of TelegrafJS I got:
Bot error: Error: 400: Bad Request: message to delete not found
this error happens ’cause the message_id that I passed no longer exists in Telegram chat. Now, the problem is that I have several controllers which can cause that problem.
I was looking at Promise.prototype.catch(), my question is: can I set up a global rejection handler for my application, or should I use a try/catch block to methods potentially subject to exceptions?
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Answer
Yes you can, and it is pretty simple:
process.on('unhandledRejection', (err) => {
//handle it!
});
You can also catch the unhandled exceptions, using the same code basically:
process.on('uncaughtException', (err) => {
//handle it!
});