import type { Observable } from "rxjs";
import { ApolloLink } from "@apollo/client/link";
export declare namespace BatchLink {
    namespace Shared {
        /** These options are shared between `BatchLink` and `BatchHttpLink` */
        interface Options {
            /**
             * The interval at which to batch, in milliseconds.
             *
             * @defaultValue 10
             */
            batchInterval?: number;
            /**
             * "batchInterval" is a throttling behavior by default, if you instead wish
             * to debounce outbound requests, set "batchDebounce" to true. More useful
             * for mutations than queries.
             */
            batchDebounce?: boolean;
            /**
             * The maximum number of operations to include in a single batch.
             *
             * @defaultValue \{\{defaultValue\}\}
             */
            batchMax?: number;
            /**
             * Creates the key for a batch
             */
            batchKey?: (operation: ApolloLink.Operation) => string;
        }
    }
    /**
     * Function type for handling a batch of GraphQL operations.
     *
     * @remarks
     *
     * The batch handler is responsible for processing multiple operations together
     * and returning their results. Each operation has a corresponding forward function
     * that can be used to continue processing down the link chain.
     *
     * Results must be returned in the same order as the input operations to ensure
     * proper correlation with the original requests.
     *
     * @param operations - Array of GraphQL operations to process
     * @param forward - Array of forward functions, one per operation
     * @returns Observable that emits an array of results in the same order as operations
     */
    type BatchHandler = (operations: ApolloLink.Operation[], forward: ApolloLink.ForwardFunction[]) => Observable<ApolloLink.Result[]>;
    /**
     * Configuration options for creating a `BatchLink` instance.
     *
     * @remarks
     *
     * `BatchLink` options control how operations are grouped into batches
     * and when those batches are processed. The `batchHandler` function
     * is responsible for actually processing the batched operations.
     *
     * Most batching behavior is configured through timing options:
     *
     * - `batchInterval`: How long to wait before processing a batch
     * - `batchDebounce`: Whether to reset the timer on new operations
     * - `batchMax`: Maximum operations per batch (0 = unlimited)
     *
     * Custom grouping logic can be implemented via `batchKey` function.
     */
    interface Options extends Shared.Options {
        /**
         * The handler that executes a batch of operations.
         *
         * @remarks
         *
         * This function receives an array of operations and their corresponding
         * forward functions, and should return an Observable that emits the results
         * for all operations in the batch.
         */
        batchHandler?: BatchLink.BatchHandler;
        /**
        * The maximum number of operations to include in a single batch.
        * 
        * @defaultValue 0
        */
        batchMax?: number;
    }
}
/**
 * `BatchLink` is a non-terminating link that provides the core batching
 * functionality for grouping multiple GraphQL operations into batches based
 * on configurable timing and key-based grouping strategies. It serves as a base
 * link to `BatchHttpLink`.
 *
 * @remarks
 *
 * > [!NOTE]
 * > You will not generally use `BatchLink` on your own unless you need to
 * > provide batching capabilities to third-party terminating links. Prefer
 * > using `BatchHttpLink` to batch GraphQL operations over HTTP.
 *
 * @example
 *
 * ```ts
 * import { BatchLink } from "@apollo/client/link/batch";
 *
 * const link = new BatchLink({
 *   batchInterval: 20,
 *   batchMax: 5,
 *   batchHandler: (operations, forwards) => {
 *     // Custom logic to process batch of operations
 *     return handleBatch(operations, forwards);
 *   },
 * });
 * ```
 */
export declare class BatchLink extends ApolloLink {
    private batcher;
    constructor(options?: BatchLink.Options);
    request(operation: ApolloLink.Operation, forward: ApolloLink.ForwardFunction): Observable<ApolloLink.Result>;
}
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