/**
 * Session rotation: reuse the persisted session across restarts while fresh,
 * rotate after an idle gap or max age. On rotation the pending queue is flushed
 * under the OLD session_id first (flush snapshots the envelope synchronously),
 * then a new id is minted. Fail-open throughout.
 */
import type { StorageAdapter } from './sink.js';
export declare const SESSION_IDLE_MS = 1800000;
export declare const SESSION_MAX_MS = 86400000;
export declare class SessionManager {
    private readonly storage;
    private readonly beforeRotate;
    private readonly onSessionId;
    private record;
    private persistScheduled;
    constructor(storage: StorageAdapter, beforeRotate: () => void, onSessionId: (id: string) => void);
    currentId(): string;
    /** Adopt the persisted session if still fresh (works for sync and async storage). */
    restore(): Promise<void>;
    /** Called on every captured event: rotate if stale, then bump activity. */
    touch(): void;
    /** Background transition: record activity so the idle gap starts now. */
    background(): void;
    /** Foreground/resume: rotate if the idle gap or max age was crossed. */
    foreground(): void;
    private stale;
    private rotate;
    private schedulePersist;
}