import { AnyRouter } from '@trpc/server';
import { NonEmptyArray } from '../internals/types';
import { HTTPLinkBaseOptions } from './internals/httpUtils';
import { HTTPHeaders, Operation, TRPCLink } from './types';
export interface HttpBatchLinkOptions extends HTTPLinkBaseOptions {
    maxURLLength?: number;
    /**
     * Headers to be set on outgoing requests or a callback that of said headers
     * @link http://trpc.io/docs/client/headers
     */
    headers?: HTTPHeaders | ((opts: {
        opList: NonEmptyArray<Operation>;
    }) => HTTPHeaders | Promise<HTTPHeaders>);
}
export declare function httpBatchLink<TRouter extends AnyRouter>(opts: HttpBatchLinkOptions): TRPCLink<TRouter>;
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