type ResultTuple<T> = [T, null] | [null, Error];
/**
 * Error tuple, go-style.
 *
 * @param fn async function to run
 *
 * @example
 *
 * const [result, error] = await attempt(async () => {
 *     return 'hello';
 * });
 *
 * if (error) {
 *     console.error(error);
 * }
 *
 * console.log(result);
 */
export declare const attempt: <T extends () => Promise<any>>(fn: T) => Promise<ResultTuple<Awaited<ReturnType<T>>>>;
/**
 * Synchronous error tuple, go-style.
 *
 * @example
 *
 * const [result, error] = attemptSync(() => {
 *     return 'hello';
 * });
 *
 * if (error) {
 *     console.error(error);
 * }
 *
 * console.log(result);
 */
export declare const attemptSync: <T extends () => any>(fn: T) => ResultTuple<ReturnType<T>>;
export {};