/**
 * @packageDocumentation
 * @module Array
 */
import { OperatorFunction, Subscribable } from 'rxjs';
/**
 * Returns an Observable that emits an Array containing unique values from the source that are not in the `compare`
 * parameter
 *
 * @category Filter
 *
 * @see Operator [[differenceAll]] when you want to get all differences in both source and input array
 * @see Operator [[filterDifference]] when you want to emit a result with duplicate values
 *
 * @typeParam T Type of value contained in the source Array or Set
 *
 * @param compare Array or Set value to compare the source value with
 *
 * @example
 * Returns values from the source Array not contained in the `compare` Array
 * ```ts
 * const input = ['a', 'b', 'd', 'a', 'b'];
 * of(input).pipe(difference(['a', 'c'])).subscribe();
 * ```
 * Output: `['b', 'd']`
 *
 * @returns Observable that emits an Array containing items from the source not in the comparison value
 */
export declare function difference<T extends unknown>(compare: Subscribable<Iterable<T>> | Iterable<T>): OperatorFunction<Iterable<T>, T[]>;