/**
 * The smallest set of ProseMirror steps that turns one document into another.
 *
 * The spike's binding replaced the whole document on every remote keystroke —
 * `tr.replace(0, size, …)`. That throws away the caret, every decoration, and
 * every node view, and its cost grows with the document rather than with the
 * edit. It is the second half of the ED-02 rewrite (the first being the live
 * cursor in `cursor.ts`).
 *
 * The recursion below is cheap because the Loro → ProseMirror projection reuses
 * the *same node objects* for untouched subtrees (see `LoroPmMapping`), so the
 * common prefix and suffix are found by reference comparison and the walk only
 * descends into what actually changed.
 */
import { type Node as PmNode } from 'prosemirror-model';
import type { Transaction } from 'prosemirror-state';
/**
 * Add the steps that turn `old_doc` into `new_doc` to `tr`.
 *
 * The transaction is returned for chaining; check `tr.docChanged` before
 * dispatching, because "nothing changed" is the common case for an event batch
 * that only touched containers this editor already agrees with.
 */
export declare function applyPmDiff(tr: Transaction, old_doc: PmNode, new_doc: PmNode): Transaction;
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