/**
 * Returns a stack trace for a given error, and also appends the stack trace of any nested error, if one exists.
 * @param error Error to stringify.
 * @returns Error stack trace.
 */
export declare function stringifyError(error: Error): string;
/**
 * Returns an error message for a given error, and also appends the error message of any nested error,
 * if one exists. It DOES NOT append error stack trace.
 * @param error Error to stringify.
 * @returns Error message including nested error messages.
 */
export declare function stringifyErrorMessage(error: Error): string;
/**
 * If given a value of type Error, return it – otherwise wrap the value in an Error.
 */
export declare function ensureError(error: unknown): Error;
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