Add null to lastJsonMessage type #258
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The user has no control over the fact that on first render,
lastJsonMessagewill benull. And it always is like that (I suspect. Without digging through the code, I don't imagine there's a scenario where the socket is established and sets the value quickly enough for it not to be?).And so I would argue that the user should have no option of not including
null. They might also wrongly assume thatundefinedis used.