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