/**
 * Extended Error class that provides access to the error cause's code property.
 * Useful for preserving and accessing error codes from underlying errors.
 *
 * @example
 * ```typescript
 * throw new ErrorWithCause('Failed to process', {
 *   cause: { code: 'INSUFFICIENT_FUNDS' }
 * });
 * ```
 */
export declare class ErrorWithCause extends Error {
    /**
     * Gets the error code from the cause object if it exists.
     *
     * @returns The error code from the cause, or undefined if not present
     */
    get code(): unknown;
}