feat: add check if listener exists

[pawk3k]

Hi everyone I just repeated the pr as it had some conflict in it for simplicity I've added this as a new one. In my use case, I need this function to check if the listener was defined in the host of the iframe and then call the native behavior of the host if the listener was not specified in other cases call the listener. This pr is just a copy of https://github.com/krakenjs/post-robot/pull/91 for bringing attention to this

[pawk3k]

It seems like some mismatched dependencies :D

[dtjones404]

Looks like one of our eslint plugins is broken: https://github.com/amilajack/eslint-plugin-compat/pull/529. Working on a fix!