/**
 * @license
 * Copyright 2026 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { Event } from './event.js';
/**
 * A specialized Event type that represents a synthesized summary of past events.
 * This is used to compress session history without losing critical context.
 */
export interface CompactedEvent extends Event {
    /**
     * Identifies this event as a compacted event.
     */
    readonly isCompacted: true;
    /**
     * The start time of the context that was compacted.
     */
    startTime: number;
    /**
     * The end time of the context that was compacted.
     */
    endTime: number;
    /**
     * The summarized content of the compacted events.
     */
    compactedContent: string;
    /**
     * Identifies this compacted event as the persistent context scratchpad.
     */
    isScratchpad?: boolean;
}
/**
 * Type guard to check if an event is a CompactedEvent.
 */
export declare function isCompactedEvent(event: Event): event is CompactedEvent;
/**
 * Type guard to check if an event is a scratchpad CompactedEvent.
 */
export declare function isScratchpadEvent(event: Event): event is CompactedEvent & {
    isScratchpad: true;
};
export declare function createCompactedEvent(params?: Partial<CompactedEvent>): CompactedEvent;