import { AbstractKey } from "unicrypto";
import { AnnotatedKey } from "./AnnotatedKey";
export declare function encode64Compact(data: Uint8Array): string;
/**
 * compare most keys used in Universa and parsec for equality. This is different from key matching, for example,
 * public and private key from the same pair __are matching but not equal__. Be careful.
 *
 * Also, it properly compares ant consider equal keys when one is wrapped in AnnotatedKey. E.g AbstractKey is
 * equal to [AnnotatedKey] when its the [AnnotatedKey.key] is equal to AnnotatedKey.
 *
 * @return true if keys are equal.
 */
export declare function equalKeys(k1: AbstractKey | AnnotatedKey, k2: AbstractKey | AnnotatedKey): boolean;
/**
 * Checks that "obj == {}" in a right manner.
 * @param obj to test for emptiness
 * @return true if object _has no keys_. Note that object with keys set to undefined is not considered empty.
 */
export declare function isEmptyObject(obj: any): boolean;
/**
 * Extended emptiness check that correctly works with regular objects `{}` and Map<K,V> instances as well. The empty
 * map is not, technically, an empty object, though in some browsers its Object.keys returns empty array, so use
 * this function instead.
 * @param obj object to check for emptiness.
 * @return true if object has no key or is an instance of the empty map
 */
export declare function isEmptyObjectOrMap(obj: any): boolean;