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Applier realizes the diff against the backing node tree. It is public API. It knows nothing about the slot table which is implementation detail.

It also only runs once the recomposition is complete and successful

If you're writing a UI toolkit on top of Compose you implement Applier to create your node tree.

`Applier` is only for node operations, `SlotWriter` is for writing composition things. You can think about it as `SlotWriter` making internal edits and `Applier` is making user facing (node related) edits.

Yeah, mostly executed immediately, unless you are running pausable composition