/**
 * Copyright (c) 2026, Salesforce, Inc.,
 * All rights reserved.
 * For full license text, see the LICENSE.txt file
 */
/**
 * Manages CSRF token fetching and caching for secure requests.
 * Implements a singleton pattern to ensure consistent token management across the application.
 */
declare class CsrfTokenManager {
    private endpoint;
    private cacheName?;
    private tokenPromise;
    private refreshPromise;
    constructor(endpoint: string, cacheName?: string | undefined);
    /**
     * Returns the current token value as a Promise.
     * Lazy-loads the token on first call (from cache or by fetching).
     */
    getToken(): Promise<string>;
    /**
     * Obtains and returns a new token value as a promise.
     * This will clear the cached token and fetch a fresh one.
     * If a refresh is already in progress, all callers share the same in-flight promise.
     */
    refreshToken(): Promise<string | undefined>;
    /**
     * Obtains a CSRF token, using cache when available or fetching a new one.
     *
     * @returns Promise that resolves to the CSRF token string
     */
    private obtainToken;
    /**
     * Provides a safe way to interact with the Cache API with fallback for unsupported environments.
     *
     * @param callback - Function that receives the cache instance and returns a promise
     * @returns The result of the callback, or undefined if caches API is not available
     */
    private withCache;
}
export { CsrfTokenManager };
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