/**
 * Generate a unique subscription ID
 */
export declare function generateSubscriptionId(): string;
/**
 * Generate webhook URL for third-party services
 */
export declare function generateWebhookUrl(publicUrl: string, subscriptionId: string): string;
/**
 * Parse URI template
 * Example: parseUriTemplate('github://repo/{owner}/{repo}', 'github://repo/octocat/hello')
 * Returns: { owner: 'octocat', repo: 'hello' }
 */
export declare function parseUriTemplate(template: string, uri: string): Record<string, string>;
/**
 * Match URI against template
 */
export declare function matchUriTemplate(template: string, uri: string): boolean;
/**
 * Create HMAC signature
 */
export declare function createHmacSignature(payload: any, secret: string, algorithm?: 'sha256' | 'sha1'): string;
/**
 * Verify HMAC signature (timing-safe comparison)
 */
export declare function verifyHmacSignature(payload: any, signature: string, secret: string, algorithm?: 'sha256' | 'sha1'): boolean;
/**
 * Sleep utility for retry delays
 */
export declare function sleep(ms: number): Promise<void>;
/**
 * Exponential backoff calculator
 */
export declare function calculateBackoff(attempt: number, baseDelay: number): number;
/**
 * Sanitize URL for logging (remove sensitive query params)
 */
export declare function sanitizeUrl(url: string): string;
/**
 * Extract error message safely
 */
export declare function extractErrorMessage(error: unknown): string;
/**
 * Validate URL format
 */
export declare function isValidUrl(url: string): boolean;
/**
 * Validate HTTPS URL
 */
export declare function isHttpsUrl(url: string): boolean;
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