good first bughelp wanted
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Description
See e.g. https://github.com/emscripten-core/emscripten/issues/5456#issuecomment-552005331 and other reports in the past. If one creates event handlers then the module cannot be GC'd even if nothing but the event handlers refers to it. The handlers must be unregistered manually.
If all event handlers used a WeakRef to everything else, then the module can be gc'd, and then the event handler can see it can just exit (and unregister itself).
As WeakRefs are not supported everywhere yet, we'd need to check for their presence.
I'm not sure if this would need to be an option or not. Doing it automatically would help some things, but maybe some codebases do want to stay alive due to event handlers.