import type { AssistantActivity, AssistantContentBlock } from './types';
/** 流式文本增量只并入最后一个 text block；activity/attachment 后的文本新开 block。 */
export declare function appendTextDelta(blocks: AssistantContentBlock[] | undefined, delta: string): AssistantContentBlock[];
/**
 * Authoritative snapshot replaces every provisional text block and is placed after the
 * current activity trace. Nomad's message_delta grows cumulatively and its final reply
 * may be DLP-redacted, so concatenating snapshots would duplicate or leak stale text.
 */
export declare function applyTextSnapshot(blocks: AssistantContentBlock[] | undefined, text: string): AssistantContentBlock[];
/** activity ID 幂等 upsert；completed 时保留 start label 并计算耗时。 */
export declare function upsertActivityBlock(blocks: AssistantContentBlock[] | undefined, activity: AssistantActivity, now?: number): AssistantContentBlock[];
export declare function finishRunningActivities(blocks: AssistantContentBlock[] | undefined, status: 'completed' | 'failed', now?: number): AssistantContentBlock[];
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