/**
 * `engine/index.tx`
 * - engine bootloader
 *
 *
 * @author      Steve Jung <steve@lemoncloud.io>
 * @date        2018-05-23 initial version
 * @date        2019-11-26 cleanup and optimized for `lemon-core#v2`
 * @date        2022-02-22 cleanup lodash export `_`
 *
 * @copyright (C) lemoncloud.io 2019 - All Rights Reserved.
 */
import { EngineOption, EngineLogger, EngineConsole, LemonEngine, EngineScope } from './types';
export declare const build_environ: (options: EngineOption) => (name: string, defVal: any) => any;
export declare const build_ts: (options?: EngineOption) => (date?: undefined | number | Date, timeZone?: number) => any;
export declare const RED = "\u001B[31m";
export declare const BLUE = "\u001B[32m";
export declare const YELLOW = "\u001B[33m";
export declare const RESET = "\u001B[0m";
export declare const build_log: ($console: EngineConsole) => EngineLogger;
export declare const build_inf: ($console: EngineConsole) => EngineLogger;
export declare const build_err: ($console: EngineConsole) => EngineLogger;
/** ****************************************************************************************************************
 *  Common functions.
 ** ****************************************************************************************************************/
/**
 * parrallel actions in list (in batch-size = 10)
 *
 * @param list          any list
 * @param callback      (item)=>any | Promise<any>
 * @param size          (optional) size
 * @param pos           (optional) current pos
 * @param result        (optional) result set.
 */
export declare const do_serialize: <T, U>(param: T[], callback: (node: T, index: number) => U, size?: number, pos?: number, result?: (Error | U)[]) => Promise<(Error | U)[]>;
/**
 * initialize as EngineInterface
 *
 * ```ts
 * import engine from 'lemon-engine';
 * const $engine = engine(global, { env: process.env });
 * ```
 *
 * @param scope         main scope like global, browser, ...
 * @param options       configuration.
 */
export declare const buildEngine: (scope?: EngineScope, options?: EngineOption) => LemonEngine;
export default buildEngine;