import type { Codec } from "@kernl-sdk/shared/lib";
import { type LanguageModelStreamEvent } from "@kernl-sdk/protocol";
import { type ThreadStreamEvent } from "kernl";
import { type UIMessageChunk } from "ai";
/**
 * Convert kernl stream to AI SDK UIMessage stream.
 *
 * @example
 * ```typescript
 * import { toUIMessageStream } from '@kernl-sdk/ai';
 * import { createUIMessageStreamResponse } from 'ai';
 *
 * const stream = agent.stream(input);
 * const ui = toUIMessageStream(stream);
 * return createUIMessageStreamResponse({ stream: ui });
 * ```
 */
export declare function toUIMessageStream(stream: AsyncIterable<ThreadStreamEvent | LanguageModelStreamEvent>): ReadableStream<UIMessageChunk>;
/**
 * Convert kernl's LanguageModelStreamEvent to AI SDK's UIMessageChunk format.
 *
 * This enables streaming kernl agent responses to AI SDK's useChat hook.
 *
 * Note: We deliberately omit providerMetadata in the conversion because:
 * 1. It's optional provider-specific metadata not needed for UI rendering
 * 2. There's a type incompatibility between SharedProviderMetadata and SharedV2ProviderMetadata
 * 3. The UI stream is focused on presentation, not provider implementation details
 */
export declare const STREAM_UI_PART: Codec<LanguageModelStreamEvent, UIMessageChunk | null>;
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