/**
 * Copyright (c) 2026 ByteDance Ltd. and/or its affiliates
 * SPDX-License-Identifier: MIT
 *
 * Content converter for Feishu messages.
 *
 * Each message type (text, post, image, etc.) has a dedicated converter
 * function that parses raw JSON content into an AI-friendly text
 * representation plus a list of resource descriptors.
 *
 * This module is a general-purpose message parsing utility — usable
 * from inbound handling, outbound formatting, and skills.
 */
import type { ConvertContext, ConvertResult } from './types';
export type { ApiMessageItem, ConvertContext, ConvertResult, ContentConverterFn } from './types';
export { buildConvertContextFromItem, extractMentionOpenId, resolveMentions } from './content-converter-helpers';
/**
 * Convert raw message content using the converter for the given message
 * type. Falls back to the "unknown" converter for unrecognised types.
 *
 * Returns a Promise because some converters (e.g. merge_forward) perform
 * async operations. Synchronous converters are awaited transparently.
 */
export declare function convertMessageContent(raw: string, messageType: string, ctx: ConvertContext): Promise<ConvertResult>;