import { PartEnvelope } from './types.js';
/**
 * JSON ↔ Yjs encode/decode for part CRDT storage.
 *
 * v1 semantics: full-part replace. The OOXML JSON tree is recursively encoded
 * into Yjs types (Y.Map / Y.Array / scalar) for the `data` field of the
 * envelope. The envelope scalars (v, clientId) are written directly.
 *
 * `decodeYjsToJson` converts the Yjs structures back to plain JSON for
 * local consumption by the mutation core.
 */
import * as Y from 'yjs';
/**
 * Encode a `PartEnvelope` into a Y.Map suitable for setting in the `parts` map.
 *
 * Layout: `Y.Map { v: number, clientId: number, data: <recursively encoded> }`
 */
export declare function encodeEnvelopeToYjs(envelope: PartEnvelope): Y.Map<unknown>;
/**
 * Decode a Y.Map from the `parts` map back into a `PartEnvelope`.
 *
 * Returns `null` if the structure is missing required fields.
 */
export declare function decodeYjsToEnvelope(yMap: Y.Map<unknown>): PartEnvelope | null;
/**
 * Read the current version from a Yjs parts map entry without full decode.
 * Returns 0 if the entry doesn't exist or lacks a version.
 */
export declare function readEnvelopeVersion(partsMap: Y.Map<unknown>, partId: string): number;
//# sourceMappingURL=json-crdt.d.ts.map