Feature request

Summary

Support persistent event listeners registered by $modx->addEventListener($eventname, $pluginId) in bootstrap.php files and allow attaching anonymous functions as event handlers.

Why is it needed?

In MODX 3, packages can use bootstrap.php for initialization, which is very convenient. However:

• When adding events with $modx->addEventListener($event, $pluginId) inside bootstrap.php, they do not work as expected because later the eventMap is reloaded and overwrites these changes.
• This forces developers to always create plugins even for simple cases, which adds unnecessary boilerplate.

Having the ability to:

1. Register persistent events directly in bootstrap.php.
2. Attach closures or callable functions as event handlers.

…would make package development cleaner and more flexible.

Suggested solution(s)

1. Ensure that event listeners registered in bootstrap.php are not removed/overwritten when the eventMap is reinitialized.
2. Extend $modx->addEventListener() to support callbacks/closures, for example:

$modx->addEventListener('OnWebPageInit', function($modx, $event) {
    // custom logic here
});

or create new method like addEventListenerClosure.

This would allow developers to bind logic directly in code without creating a separate plugin element.

Related issue(s)/PR(s)

Not found yet.