import { Enumerable } from "../enumerable";
declare module '../enumerable' {
    interface Enumerable<TSource> {
        where(predicate: (item: TSource, idx?: number) => boolean): Enumerable<TSource>;
    }
}
export declare function where<TSource>(this: Enumerable<TSource>, predicate: (item: TSource, idx?: number) => boolean): Enumerable<TSource>;