import { ServiceNowInstance } from "../../sn/ServiceNowInstance.js";
import { ServiceNowRequest } from "./ServiceNowRequest.js";
/**
 * Singleton registry of authenticated ServiceNowRequest instances keyed by instance alias.
 * Ensures all components sharing the same alias reuse the same HTTP session.
 */
export declare class SessionManager {
    private static _instance;
    private _sessions;
    private _authPromises;
    private _logger;
    private constructor();
    static getInstance(): SessionManager;
    /** @internal Visible for testing only — not exported from index.ts */
    static resetInstance(): void;
    /**
     * Get or create a ServiceNowRequest for this instance.
     * Keyed by alias (falls back to host).
     */
    getRequest(instance: ServiceNowInstance): ServiceNowRequest;
    /**
     * True when the cached request was built for exactly this instance.
     *
     * Answers "leave the cache alone" whenever identity cannot be established on
     * either side — a request built without an instance, or a caller passing a
     * duck-typed instance that predates getInstanceId(). Evicting on unknown
     * identity would throw away a good session and force a fresh login on every
     * single lookup, which is a worse failure than the one being guarded against.
     */
    private isBoundTo;
    /**
     * Get or create a ServiceNowRequest and ensure it is authenticated.
     * Uses an in-flight promise guard to prevent duplicate concurrent auth calls.
     */
    getAuthenticatedRequest(instance: ServiceNowInstance): Promise<ServiceNowRequest>;
    /**
     * Remove cached session for a given alias.
     */
    clearSession(alias: string): void;
    /**
     * Remove all cached sessions.
     */
    clearAll(): void;
    /**
     * Check if a session exists for a given alias.
     */
    hasSession(alias: string): boolean;
    private getKey;
}