import { FlowrConfig, type KnownEngines } from './config';
/**
 * Retrieve all requested engine instance.
 * Please make sure that if this includes the R engine, that you properly shut it down again!
 */
export declare function retrieveEngineInstances(config: FlowrConfig, defaultOnly?: boolean): Promise<{
    engines: KnownEngines;
    default: keyof KnownEngines;
}>;