/**
 * Conversion utilities between Strands SDK content blocks and A2A protocol parts.
 *
 * Supports text, images, videos, documents, and structured data.
 */
import type { Part } from '@a2a-js/sdk';
import type { ContentBlock } from '../types/messages.js';
/**
 * Converts A2A protocol parts to Strands SDK content blocks.
 *
 * Handles text, file (image/video/document), and structured data parts,
 * @param parts - Array of A2A protocol parts
 * @returns Array of Strands content blocks
 */
export declare function partsToContentBlocks(parts: Part[]): ContentBlock[];
/**
 * Converts Strands SDK content blocks to A2A protocol parts.
 *
 * Supports text, image, video, and document blocks. Image and video blocks
 * with byte sources are encoded as base64 file parts; URL-based sources
 * become URI file parts. Unsupported block types are silently skipped.
 *
 * @param blocks - Array of Strands content blocks
 * @returns Array of A2A parts
 */
export declare function contentBlocksToParts(blocks: ContentBlock[]): Part[];
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