import { Logger } from 'typescript-log';
export interface Options<MasterArgs> {
    /** Number of workers (default cpu count), if 0, starts in process. Defaults to # of cpu cores */
    workers: number;
    /** ms to keep cluster alive (until-killed) */
    lifetime: number | 'until-killed';
    /** ms grace period after worker SIGTERM (default 5000) */
    grace: number;
    /** Logger */
    logger?: Logger;
    /** Return a promise if there is startup work before workers are started */
    master?: () => Promise<MasterArgs> | void;
    /**
     * Return a promise if there is startup work before worker is considered started
     *
     * @argument masterArgs if master returns a promise this will be the resolved value
     */
    start?: (args: {
        id: string;
        masterArgs: MasterArgs | undefined;
    }) => Promise<any> | void;
    dedicatedWorkers?: {
        [name: string]: (args: {
            id: string;
            masterArgs: MasterArgs | undefined;
        }) => Promise<any> | void;
    };
    /** ms to wait for master to become available to supply masterArgs (default 5000) */
    masterArgsWait?: number;
}
/**
 * Resolves when the current start function (master or start depending on context) has
 * finished initialising.
 * @param startOrOptions
 */
export declare function gru<MasterArgs = undefined>(startOrOptions: (Partial<Options<MasterArgs>> & {
    start: Options<MasterArgs>['start'];
}) | (() => void)): Promise<void>;