/**
 * In-flight web chat run snapshots.
 *
 * React state (activity accordion, "接收中", run timeline) is wiped on
 * refresh / WS reconnect because HISTORY only carries role/content. This
 * module keeps a per-thread snapshot so get-history can replay the live
 * (or just-finished) run, and so chunk/activity emits can retarget the
 * reconnecting socket instead of a closed one.
 */
export type ActiveRunStepStatus = 'pending' | 'running' | 'success' | 'error' | 'denied';
export type ActiveRunStepKind = 'tool' | 'skill' | 'status' | 'approval' | 'ask' | 'agent';
export interface ActiveRunStep {
    id: string;
    kind: ActiveRunStepKind;
    label: string;
    status: ActiveRunStepStatus;
    startedAt: number;
    finishedAt?: number;
    preview?: string;
    todoItems?: Array<{
        content: string;
        status: 'pending' | 'in_progress' | 'completed';
    }>;
}
export interface ActiveRunSnapshot {
    threadId: string;
    runId: string;
    agent: string;
    startedAt: number;
    status: 'running' | 'success' | 'error';
    steps: ActiveRunStep[];
    partialText: string;
    finishedAt?: number;
    durationMs?: number;
    error?: string;
}
export declare function startActiveRun(input: {
    threadId: string;
    runId: string;
    agent: string;
    startedAt: number;
}): ActiveRunSnapshot;
export declare function upsertActiveRunStep(threadId: string, step: ActiveRunStep): void;
export declare function appendActiveRunChunk(threadId: string, chunk: string): void;
export declare function setActiveRunPartialText(threadId: string, text: string): void;
export declare function finishActiveRun(threadId: string, outcome: {
    status: 'success' | 'error';
    finishedAt: number;
    durationMs: number;
    finalText?: string;
    error?: string;
}): void;
export declare function getActiveRun(threadId: string): ActiveRunSnapshot | undefined;
export declare function clearActiveRun(threadId: string): void;
/** Convert a snapshot into the durable ChatMessage.activity shape. */
export declare function snapshotToPersistedActivity(snap: ActiveRunSnapshot): {
    runId: string;
    status: 'running' | 'success' | 'error';
    startedAt: number;
    finishedAt?: number;
    durationMs?: number;
    error?: string;
    steps: ActiveRunStep[];
};
/** Test helper. */
export declare function _resetActiveRunsForTests(): void;
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