import { type UIMessage, type UIDataTypes, type UITools } from "ai";
import { type LanguageModelItem } from "@kernl-sdk/protocol";
/**
 * Converter for transforming Vercel AI SDK UIMessage format (used by useChat hook)
 * to kernl's LanguageModelItem format.
 *
 * @example
 * ```typescript
 * import { UIMessageCodec } from '@kernl-sdk/ai';
 *
 * // Validate and convert incoming UI message to kernl format
 * const items = await UIMessageCodec.decode(uiMessage);
 * ```
 */
export declare const UIMessageCodec: AsyncCodec<LanguageModelItem, UIMessage>;
/**
 * Async codec for converting between two formats.
 * Similar to Codec but decode is async and returns an array.
 */
type AsyncCodec<From, To> = {
    encode: (item: From) => To;
    decode: <METADATA = unknown, DATA_PARTS extends UIDataTypes = UIDataTypes, TOOLS extends UITools = UITools>(message: To extends UIMessage ? UIMessage<METADATA, DATA_PARTS, TOOLS> : To) => Promise<From[]>;
};
/**
 * Convert thread history events to AI SDK UIMessages for useChat hook.
 *
 * Groups tool calls with their results and attaches them to the preceding
 * assistant message as parts.
 *
 * @example
 * ```ts
 * import { historyToUIMessages } from '@kernl-sdk/ai';
 *
 * const thread = await kernl.threads.get("thread_123");
 * const messages = historyToUIMessages(thread.history);
 * ```
 */
export declare function historyToUIMessages(items: LanguageModelItem[]): UIMessage[];
export {};
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