import { PartEnvelope } from './types.js';
/**
 * JSON ↔ Yjs encode/decode for part CRDT storage.
 *
 * v1 semantics: full-part replace. Envelopes are stored as JSON-safe plain
 * objects inside the Yjs parts map instead of nested Yjs types. This avoids
 * duplicate-Yjs constructor mismatches when a caller provides a Y.Doc created
 * by a different bundled copy of Yjs.
 *
 * `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 JSON-safe value for the `parts` map.
 */
export declare function encodeEnvelopeToYjs(envelope: PartEnvelope): Record<string, unknown>;
/**
 * Decode a stored `parts` value back into a `PartEnvelope`.
 *
 * Returns `null` if the structure is missing required fields.
 */
export declare function decodeYjsToEnvelope(value: 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;
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