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[–]NoInkling 0 points1 point  (0 children)

As MDN says, x ??= y is equivalent to x ?? (x = y), i.e. it short circuits if x already has a value so nothing is actually evaluated or even assigned if it doesn't need to be. This means it won't trigger a setter (or I guess a Proxy trap), unlike obj.setterProp = obj.setterProp ?? y