/**
 * @license
 * Copyright 2026 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { Event } from '../events/event.js';
/**
 * Filters the events to return only the active events since the latest compaction.
 * If no compaction has occurred, returns all events.
 *
 * @param events The full history of events.
 * @returns The active events, starting with the latest CompactedEvent if present.
 */
export declare function getActiveEvents(events: Event[]): Event[];
/**
 * Determines the baseline index to retain from active raw events,
 * ensuring we don't split between a function call and its response.
 *
 * @param rawEvents The active raw events to consider for compaction.
 * @param eventRetentionSize The minimum number of raw events to keep at the end of the session.
 * @returns The index in `rawEvents` at which to split. Events before this index will be compacted.
 */
export declare function calculateRetainStartIndex(rawEvents: Event[], eventRetentionSize: number): number;