I’m wondering if there’s any way to directly modify the the tr before it’s dispatched rather than only being able to create a new one.
No, that’s not possible. handleDOMEvents, the way it is defined, has nothing to do with transactions. Some of the built-in event handlers allow further customization through props. Mutating transactions dispatched by other code is not generally something that is safe or possible.
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Thank you for your reply @marijn.
If possible, as a possible future development, I feel that the ability to at least set metadata on these transactions would be a valuable addition.