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