import { IMemory, MemoryFilter } from '../../base';
import { EphemeralMemoryUnit } from './types';
import { z } from 'zod';
declare class EphemeralMemory implements IMemory<EphemeralMemoryUnit> {
    private duration;
    private items;
    private maxItems;
    private events;
    private logger;
    /**
     * Creates an instance of EphemeralMemory
     * @param duration Duration in milliseconds before items expire. Set to -1 for non-expiring items.
     * @param maxItems Maximum number of items to store before oldest items are removed
     */
    constructor(duration?: number, maxItems?: number);
    createMemoryUnit<C>(content: C | string, schema?: z.ZodType<C>, metadata?: Map<string, any>): EphemeralMemoryUnit;
    store(item: Omit<EphemeralMemoryUnit, 'memoryType'>): Promise<void>;
    private purgeExpired;
    getAll(): Promise<EphemeralMemoryUnit[]>;
    clear(): Promise<void>;
    retrieve(id: string): Promise<EphemeralMemoryUnit | null>;
    query(filter: MemoryFilter): Promise<EphemeralMemoryUnit[]>;
    delete(id: string): Promise<void>;
    onEvent(callback: (unit: EphemeralMemoryUnit) => void): void;
    isMemoryUnitOfType(unit: any): unit is EphemeralMemoryUnit;
    /**
     * Get current number of items in memory
     */
    size(): number;
    /**
     * Get maximum capacity
     */
    capacity(): number;
}
export { EphemeralMemory };