import { Enumerable } from "./Enumerable";
export declare class UnionEnumerable<T = any> extends Enumerable<T> {
    protected readonly parent: Enumerable<T>;
    protected readonly parent2: Enumerable<T>;
    readonly isUnionAll: boolean;
    constructor(parent: Enumerable<T>, parent2: Enumerable<T>, isUnionAll?: boolean);
    protected generator(): IterableIterator<T>;
}