/**
 * PeriodicNotifier — periodic silent injection of delegation progress
 * into parent sessions via combined batch blocks.
 *
 * Queues all delegation snapshots within a 2-second batch window,
 * then flushes ONE combined <system_reminder> block with ALL changed
 * delegations. Single injection path — no double injection.
 * Fire-and-forget: sendPromptAsync failures are caught and logged.
 */
export interface DelegationSnapshot {
    delegationId: string;
    parentSessionId: string;
    agent: string;
    toolCount: number;
    actionCount: number;
    elapsedMs: number;
}
export interface PeriodicNotifierConfig {
    cadenceMs: number;
    batchWindowMs?: number;
    showToast?: boolean;
    client: unknown;
}
type InjectFn = (parentSessionId: string, line: string, delegationId?: string) => void;
/**
 * Strips duration string from a formatted line so dedup comparison
 * focuses on toolCount and actionCount changes, not elapsed time.
 */
declare function stripDuration(line: string): string;
export declare class PeriodicNotifier {
    private readonly config;
    private readonly inject;
    private readonly tracked;
    private readonly pendingFlush;
    private flushTimer;
    private lastBatchHash;
    private destroyed;
    constructor(config: PeriodicNotifierConfig, inject: InjectFn);
    get activeCount(): number;
    register(snapshot: DelegationSnapshot): void;
    deregister(delegationId: string): void;
    handlePollTick(snapshot: DelegationSnapshot): void;
    private scheduleFlush;
    private flush;
    destroy(): void;
}
export { stripDuration };
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