You're right, it will run once with null for the previous node, and then once more with the new node.
There are apparently some plans to "fix" callback refs by allowing them to return a cleanup function like useEffect does: twitter.com/dan_abramov/status/155...
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You're right, it will run once with
nullfor the previous node, and then once more with the new node.There are apparently some plans to "fix" callback refs by allowing them to return a cleanup function like useEffect does: twitter.com/dan_abramov/status/155...