import { AsyncIterableX } from './asynciterablex';
export declare class ExceptAsyncIterable<TSource> extends AsyncIterableX<TSource> {
    private _first;
    private _second;
    private _comparer;
    constructor(first: AsyncIterable<TSource>, second: AsyncIterable<TSource>, comparer: (x: TSource, y: TSource) => boolean | Promise<boolean>);
    [Symbol.asyncIterator](): AsyncIterableIterator<TSource>;
}
export declare function except<TSource>(first: AsyncIterable<TSource>, second: AsyncIterable<TSource>, comparer?: (x: TSource, y: TSource) => boolean | Promise<boolean>): AsyncIterableX<TSource>;