ECMAScript 6 class destructor

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Is there such a thing as destructors for ECMAScript 6?

No. EcmaScript 6 does not specify any garbage collection semantics at all[1], so there is nothing like a “destruction” either.

If I register some of my object’s methods as event listeners in the constructor, I want to remove them when my object is deleted

A destructor wouldn’t even help you here. It’s the event listeners themselves that still reference your object, so it would not be able to get garbage-collected before they are unregistered.
What you are actually looking for is a method of registering listeners without marking them as live root objects. (Ask your local eventsource manufacturer for such a feature).

1): Well, there is a beginning with the specification of WeakMap and WeakSet objects. However, true weak references are still in the pipeline [1][2].

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