import type { LTILaunchConfig, LTISession } from '@lti-tool/core';
import { LRUCache } from 'lru-cache';
export declare const LAUNCH_CONFIG_CACHE: LRUCache<string, LTILaunchConfig | typeof undefinedLaunchConfigValue, unknown>;
export declare const SESSION_CACHE: LRUCache<string, LTISession | typeof undefinedSessionValue, unknown>;
export declare const SESSION_TTL: number;
export declare const NONCE_TTL: number;
export declare const undefinedLaunchConfigValue: unique symbol;
export type undefinedLaunchConfig = typeof undefinedLaunchConfigValue;
export declare const undefinedSessionValue: unique symbol;
export type undefinedSession = typeof undefinedSessionValue;
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