/**
 * Migration: `meta.docx` → Yjs `parts` map.
 *
 * Copies non-document OOXML parts from the legacy `meta.docx` array into
 * individual `parts` map entries with versioned envelopes. The migration is
 * idempotent and safe to re-run — already-present keys are skipped.
 *
 * `meta.docx` is NEVER deleted or modified.
 */
import * as Y from 'yjs';
export interface MigrationResult {
    migrated: boolean;
    partsMigrated: number;
    error: string | null;
}
/**
 * Determine if migration from `meta.docx` → `parts` is needed.
 *
 * Migration triggers when any of these hold:
 * 1. `parts` map has no non-document entries and `meta.docx` exists.
 * 2. `parts` map exists but is missing keys present in `meta.docx`.
 * 3. `partsMigration.status` is not `'success'`.
 */
export declare function isMigrationNeeded(ydoc: Y.Doc): boolean;
/**
 * Run the migration from `meta.docx` to individual `parts` entries.
 *
 * All-or-nothing: parse all candidates first, then write them in a single
 * Yjs transaction. On parse failure, nothing is written.
 */
export declare function migrateMetaDocxToParts(ydoc: Y.Doc, options?: {
    force?: boolean;
}): MigrationResult;
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