removeEventListener without knowing the function

by

getEventListeners(window) will return a map of events and their registered event listeners.

So for DOMContentLoaded event for example you can have many event listeners. If you know the index of the listener you want to remove (or if there exists only one), you can do:

var eventlistener = getEventListeners(window)["DOMContentLoaded"][index];
window.removeEventListener("DOMContentLoaded", 
                           eventlistener.listener,
                           eventlistener.useCapture);

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