In Chrome DevTools you can use getEventListeners(object) to get a list of registered event listeners on the specified object.

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You can also do this without the console, by selecting an element in the DOM inspector. In the element details, select the tab Event Listeners".

Example

const registry = getEventListeners(document)

registry['up-click']
// 0: { useCapture: false, passive: false, once: false, type: 'up:click', listener: ƒ }
// 1: { useCapture: false, passive: false, once: false, type: 'up:click', listener: ƒ }
// ...
// length: n