import { type SourceState } from './stream-renderer-source.js';
import type { ProgressEvent } from '../../agent/types.js';
export declare const STICKY_HOLD_MS = 3000;
export declare const CHILD_QUIET_MS = 8000;
export interface ChildActivity {
    sourceId: string;
    label: string;
    clause: string;
    quiet: boolean;
}
export declare function countRunningChildren(sources: ReadonlyMap<string, SourceState> | undefined, now?: number): number;
export declare class ChildActivityTracker {
    private prev;
    select(sources: ReadonlyMap<string, SourceState>, now?: number): ChildActivity | undefined;
    reset(): void;
}
export declare function formatChildActivity(activity: ChildActivity): string;
export interface ChildBannerStats {
    toolUses: number;
    totalTokens: number;
    durationMs: number;
}
export declare function deriveChildBanner(ctx: {
    sources?: ReadonlyMap<string, SourceState>;
    childActivity?: ChildActivityTracker;
}, now?: number): {
    activity: string;
    stats: ChildBannerStats;
} | undefined;
export declare const CHILD_BANNER_TASK_ID = "__child_activity__";
export declare function childBannerEvent(stats: ChildBannerStats): ProgressEvent;