import type { IUnitMark } from './i-unit-mark.js';
/**
 * Several mark ledgers as one, deduplicated by (list, unit), first wins — for
 * an engine entry that normalises defensively: the loaded rule's
 * `expectEmptyUnits` first, then whatever `normalizeUnitList` found in a
 * hand-built list.
 */
export declare function mergeUnitMarks(...ledgers: readonly (readonly IUnitMark[] | undefined)[]): readonly IUnitMark[];
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