import type { PdfAnnotationSnapshot } from './types.js';
/**
 * Serializes an annotation snapshot to JSON, including FreeText fallback image bytes.
 *
 * @param snapshot - The current immutable session snapshot.
 * @returns The resulting string.
 *
 */
export declare function serializeAnnotationSnapshot(snapshot: PdfAnnotationSnapshot): string;
/**
 * Parses JSON produced by {@link serializeAnnotationSnapshot}.
 *
 * @param json - The JSON value to parse.
 * @returns The resulting PdfAnnotationSnapshot.
 *
 */
export declare function deserializeAnnotationSnapshot(json: string): PdfAnnotationSnapshot;
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