Description

Hi! I'm new to using Bolt and Slack in general.
Been scratching my head over why my custom receiver was not working, and when I looked at the source code in src/App.tsx I noticed this:

if (signingSecret !== undefined) {
      this.receiver = new ExpressReceiver({ signingSecret, endpoints });	      this.receiver = new ExpressReceiver({ signingSecret, logger, endpoints });
    } else if (receiver === undefined) {	    } 

So I commented out the SigningSecret that I was previously passing and it worked!

I think the application should either not overwrite the passed receiver, or log a warning in this scenario.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.

Bug Report

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Reproducible in:

package version: 1.2.0

node version: 12.6.0

OS version(s): Windows 10 Pro

Steps to reproduce:

1. Create a custom receiver class
2. Instantiate an App with a custom receiver and signing key
3. Emit an event with the receiver

Expected result:

Bolt doesn't overwrite my receiver with the ExpressReceiver

Actual result:

Bolt overwrites my receiver with the ExpressReceiver

Attachments:

https://github.com/slackapi/bolt/blob/522e70b381cf3d18a88b7ca271dcfb4f0ce1be9b/src/App.ts#L161