import type { DataSource } from '../DataSource';
import type { BlockedRequest } from './BlockedRequest';
import type { Chunk } from '@principia/base/Chunk';
import type { HashMap } from '@principia/base/HashMap';
export declare class Sequential<R> {
    private map;
    readonly _tag = "Sequential";
    constructor(map: HashMap<DataSource<any, any>, Chunk<Chunk<BlockedRequest<any>>>>);
    ['++']<R1>(that: Sequential<R1>): Sequential<R & R1>;
    get isEmpty(): boolean;
    get keys(): Iterable<DataSource<R, any>>;
    get toIterable(): Iterable<readonly [DataSource<R, any>, Chunk<Chunk<BlockedRequest<any>>>]>;
}
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