import ITokenProvider from './ITokenProvider';
import Token from './Token';
/**
 * A token provider that wraps another provider with automatic caching.
 * Tokens are cached and reused until they are close to expiring.
 */
export default class CachedTokenProvider implements ITokenProvider {
    private readonly baseProvider;
    private readonly refreshThresholdMs;
    private cache;
    private refreshPromise;
    /**
     * Creates a new CachedTokenProvider.
     * @param baseProvider - The underlying token provider to cache
     * @param options - Optional configuration
     * @param options.refreshThresholdMs - Refresh tokens this many ms before expiry (default: 5 minutes)
     */
    constructor(baseProvider: ITokenProvider, options?: {
        refreshThresholdMs?: number;
    });
    getToken(): Promise<Token>;
    getName(): string;
    /**
     * Clears the cached token, forcing a refresh on the next getToken() call.
     */
    clearCache(): void;
    /**
     * Determines if the token should be refreshed.
     * @param token - The token to check
     * @returns true if the token should be refreshed
     */
    private shouldRefresh;
    /**
     * Fetches a new token from the base provider and caches it.
     */
    private refreshToken;
}