import * as A from "@effect-ts/core/Collections/Immutable/Chunk";
import * as HM from "@effect-ts/core/Collections/Immutable/HashMap";
import { _R } from "@effect-ts/core/Effect";
import type { DataSource } from "../../DataSource/index.js";
import type { BlockedRequest } from "../BlockedRequest/index.js";
/**
 * A `Sequential[R]` maintains a mapping from data sources to batches of
 * requests from those data sources that must be executed sequentially.
 */
export declare class Sequential<R> {
    readonly map: HM.HashMap<DataSource<unknown, unknown>, A.Chunk<A.Chunk<BlockedRequest<unknown>>>>;
    readonly [_R]: (r: R) => void;
    constructor(map: HM.HashMap<DataSource<unknown, unknown>, A.Chunk<A.Chunk<BlockedRequest<unknown>>>>);
}
/**
 * Combines this collection of batches of requests that must be executed
 * sequentially with that collection of batches of requests that must be
 * executed sequentially to return a new collection of batches of requests
 * that must be executed sequentially.
 */
export declare function add<R1>(that: Sequential<R1>): <R>(self: Sequential<R>) => Sequential<R & R1>;
/**
 * Combines this collection of batches of requests that must be executed
 * sequentially with that collection of batches of requests that must be
 * executed sequentially to return a new collection of batches of requests
 * that must be executed sequentially.
 */
export declare function add_<R, R1>(self: Sequential<R>, that: Sequential<R1>): Sequential<R & R1>;
/**
 * Returns whether this collection of batches of requests is empty.
 */
export declare function isEmpty<R>(self: Sequential<R>): boolean;
/**
 * Returns a collection of the data sources that the batches of requests in
 * this collection are from.
 */
export declare function keys<R>(self: Sequential<R>): Iterable<DataSource<R, unknown>>;
/**
 * Converts this collection of batches requests that must be executed
 * sequentially to an `Iterable` containing mappings from data sources to
 * batches of requests from those data sources.
 */
export declare function toIterable<R>(self: Sequential<R>): Iterable<readonly [DataSource<R, unknown>, A.Chunk<A.Chunk<BlockedRequest<R>>>]>;
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