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Other than regularly polling for changes, is there any (standard) way to register an event or callback that will be triggered any time a new property is added to a specific object?
Simply put, the answer is no.
Mozilla’s JavaScript implementation has an overload for unresolvable methods, but it doesn’t work for standard properties, see
__noSuchMethod__. Of course, you asked for a standard method and no other implementations support this as far as I’m aware.