import { IterableX } from './iterablex';
export declare class ExceptIterable<TSource> extends IterableX<TSource> {
    private _first;
    private _second;
    private _comparer;
    constructor(first: Iterable<TSource>, second: Iterable<TSource>, comparer: (x: TSource, y: TSource) => boolean);
    [Symbol.iterator](): IterableIterator<TSource>;
}
/**
 * Produces the set difference of two sequences by using the an equality comparer to compare values.
 * @param {Iterable<T>} first A sequence whose elements that are not also in second will be returned.
 * @param {Iterable<T>} second A sequence whose elements that also occur in the first sequence will cause those
 * elements to be removed from the returned sequence.
 * @param {function(x: TKey, y: TKey): boolean} [comparer] Comparer used to compare key values.
 * @return {Iterable<T>} A sequence that contains the set difference of the elements of two sequences.
 */
export declare function except<TSource>(first: Iterable<TSource>, second: Iterable<TSource>, comparer?: (x: TSource, y: TSource) => boolean): IterableX<TSource>;