/**
 * @purpose Synchronously unwrap a result tuple.
 * @throws Error from resultTuple[1] if present; SyntaxError for invalid format.
 */
export declare const unguard: <TResult>(result: unknown) => TResult;
/**
 * @purpose Unwrap result (tuple or Promise\<tuple\>); throws on error.
 * @throws Error from tuple if present; SyntaxError for invalid format (see unguard).
 */
export declare const unguardOrThrow: <TResult>(resultOrPromise: [TResult, null] | [null, Error] | Promise<[TResult, null] | [null, Error]>) => Promise<TResult>;