/**
 * Event handlers for message streaming events:
 * message_start, message_update, message_end.
 *
 * Also includes pure helper functions for content partitioning.
 */
import type { HarnessMessage } from '@mastra/core/harness';
import type { EventHandlerContext } from './types.js';
export declare function handleMessageStart(ctx: EventHandlerContext, message: HarnessMessage): void;
export declare function handleMessageUpdate(ctx: EventHandlerContext, message: HarnessMessage): void;
export declare function handleMessageEnd(ctx: EventHandlerContext, message: HarnessMessage): void;
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