/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import type { AttemptOptions } from '../types.js';
/**
 * Detects promise-like values returned by internal loaders and callbacks.
 */
export declare function isPromise<T>(value: T | Promise<T>): value is Promise<T>;
type SwallowingAttemptOptions<TResult> = AttemptOptions<TResult, void>;
type RethrowingAttemptOptions<TResult> = AttemptOptions<TResult, never>;
/**
 * Runs a callback and normalizes sync and async error/finally handling.
 *
 * @remarks
 * - If try succeeds, its result is returned.
 * - If try fails and catch is omitted, the original error is propagated.
 * - If try fails and catch throws, that error is propagated.
 * - If try fails and catch completes normally, the failure is treated as swallowed
 *   and attempt returns or resolves to undefined.
 * - catch is side-effect only; any value it returns is ignored.
 * - Type narrowing is based on whether catch is omitted or its declared return type:
 *   omitted or never means the error is rethrown, void means the error may be swallowed.
 * - finally runs once for both sync and async paths.
 */
export declare function attempt<TResult>(options: RethrowingAttemptOptions<TResult>): TResult;
export declare function attempt<TResult>(options: RethrowingAttemptOptions<Promise<TResult>>): Promise<TResult>;
export declare function attempt<TResult>(options: SwallowingAttemptOptions<TResult>): TResult | undefined;
export declare function attempt<TResult>(options: SwallowingAttemptOptions<Promise<TResult>>): Promise<TResult | undefined>;
export {};