import { Plugin, PluginKey } from 'prosemirror-state';
/**
 * ProseMirror plugin that enforces M1 chart immutability.
 *
 * Rejects any transaction that deletes, replaces, modifies attrs of,
 * or inserts a chart node.
 *
 * Performance characteristics:
 * - Chart-free docs: O(1) per transaction (checks step slices only)
 * - Docs with charts: O(chart count) per transaction (maps old positions)
 * - Never O(doc size) during editing — full scan only at init
 * - Globally registered but zero-cost when no charts exist
 */
export function createChartImmutabilityPlugin(): Plugin<number>;
export const CHART_IMMUTABILITY_KEY: PluginKey<any>;
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