import type { Blob } from './blob-from.js';
/**
 * Check if `obj` is a URLSearchParams object
 * ref: https://github.com/node-fetch/node-fetch/issues/296#issuecomment-307598143
 * @param {*} object - Object to check for
 * @return {boolean}
 */
export declare const isURLSearchParameters: (object: any) => boolean;
/**
 * Check if `object` is a W3C `Blob` object (which `File` inherits from)
 * @param object Object to check for
 */
export declare const isBlob: (value: unknown) => value is Blob;
/**
 * Check if `obj` is an instance of AbortSignal.
 * @param object - Object to check for
 */
export declare const isAbortSignal: (object: unknown) => object is AbortSignal;
/**
 * isDomainOrSubdomain reports whether sub is a subdomain (or exact match) of
 * the parent domain.
 *
 * Both domains must already be in canonical form.
 * @param {string|URL} original
 * @param {string|URL} destination
 */
export declare const isDomainOrSubdomain: (destination: any, original: any) => boolean;
/**
 * isSameProtocol reports whether the two provided URLs use the same protocol.
 *
 * Both domains must already be in canonical form.
 * @param {string|URL} original
 * @param {string|URL} destination
 */
export declare const isSameProtocol: (destination: any, original: any) => boolean;