Calling custom command leads to error event listener > defaultMaxListeners error

[kretschmannj]

Description of the bug/issue

Calling a custom command is incrementing the error event listener count eventually leading to an error indicating that the number of listeners exceeds the max limit (yes, I realize you can increase the defaultMaxListeners value but that is a workaround, not a solution).

Steps to reproduce

1. Create logMsg.js in the custom_commands folder
2. Create test.js in the tests folder
3. Add console log to node_modules\nightwatch\lib\core\treenode.js ...

    commandResult
      .once('complete', result => {
        resolveFn(result);
      })
    **if (commandResult.listenerCount("error") > 0) console.log("commandResult error listener count: " + commandResult.listenerCount("error") + " [" + this.fullName + "]")**
    commandResult
      .once('error', (err, abortOnFailure) => {
        err.abortOnFailure = abortOnFailure || abortOnFailure === undefined;
        rejectFn(err);
      });

5. Run tests.js (node nightwatch -e firefox tests/test.js)

Sample test

logMsg.js
exports.command = function () {
	this.pause(1) // function won't exit without this
}

test.js
module.exports = {
	"Test" : browser => {
		browser.logMsg().pause(1000)
		browser.logMsg().pause(1000)
		browser.logMsg().pause(1000)
		browser.logMsg().pause(1000)
	}
}

Command to run

node nightwatch -e firefox tests/test.js

Verbose Output

Starting test  [sessionId: 7f0618e7-3ec3-47db-9b7e-3e95c10e99f0]

  Running Test:
─────────────────────────────────────────────────────────────────────────────────────────────────────────────────
commandResult error listener count: 1 [logMsg]
commandResult error listener count: 2 [logMsg]
commandResult error listener count: 3 [logMsg]
commandResult error listener count: 4 [logMsg]
No assertions ran.


Completed test

Nightwatch Configuration

No response

Nightwatch.js Version

2.3.0

Node Version

14.17.1

Browser

No response

Operating System

Windows 10

Additional Information

No response