import { type Dispatch, type MutableRefObject, type SetStateAction } from 'react';
import type { LlmExecutionTools } from '../../../execution/LlmExecutionTools';
import type { id } from '../../../types/string_token';
import type { ChatMessage } from '../types/ChatMessage';
import type { LlmChatProps } from './LlmChatProps';
/**
 * Minimal task-progress item rendered by `<Chat/>`.
 *
 * @private function of `useLlmChatMessageHandler`
 */
type LlmChatTaskProgress = {
    readonly id: string;
    readonly name: string;
    readonly progress?: number;
};
/**
 * Internal send signature shared across retry and visibility-recovery flows.
 *
 * @private function of `useLlmChatMessageHandler`
 */
type HandleMessageFn = (messageContent: string, attachments?: ChatMessage['attachments']) => Promise<void>;
/**
 * Inputs required by `useLlmChatMessageHandler`.
 *
 * @private function of `useLlmChatMessageHandler`
 */
type UseLlmChatMessageHandlerProps = {
    readonly chatFailMessage: string;
    readonly hasUserInteractedRef: MutableRefObject<boolean>;
    readonly llmParticipantName: id;
    readonly llmTools: LlmExecutionTools;
    readonly messages: ReadonlyArray<ChatMessage>;
    readonly onError?: LlmChatProps['onError'];
    readonly promptParameters: Record<string, string>;
    readonly setMessages: Dispatch<SetStateAction<Array<ChatMessage>>>;
    readonly setTasksProgress: Dispatch<SetStateAction<Array<LlmChatTaskProgress>>>;
    readonly thinkingVariants: ReadonlyArray<string>;
    readonly thread?: ReadonlyArray<ChatMessage>;
    readonly userParticipantName: id;
};
/**
 * State and handlers returned by `useLlmChatMessageHandler`.
 *
 * @private function of `useLlmChatMessageHandler`
 */
type UseLlmChatMessageHandlerResult = {
    readonly clearLastFailedMessage: () => void;
    readonly handleMessage: HandleMessageFn;
    readonly handleStopStreaming: () => void;
    readonly isStreaming: boolean;
};
/**
 * Manages send, stream, retry, and background-recovery flows for `<LlmChat/>`.
 *
 * @private function of `useLlmChatState`
 */
export declare function useLlmChatMessageHandler(props: UseLlmChatMessageHandlerProps): UseLlmChatMessageHandlerResult;
export {};