import { IUnifiedEnvOptions, LogLevel, IFileOptions, IObjectOfStings, IEnvOption, IEnvOptionsObject } from './interfaces';
import { UnifiedEnv } from '../index';
export declare const LOG_LEVELS: LogLevel[];
export declare const LIB_NAME = "UnifiedEnv";
export declare function isEnvOptionObject(option: IEnvOption | boolean): option is IEnvOption;
export declare function validateConfigOptions(options: IUnifiedEnvOptions): void;
export declare function parseEnvFile(this: UnifiedEnv<any, any>, fileOptions: IFileOptions): IObjectOfStings;
export declare function parseArgv(this: UnifiedEnv<any, any>, argv: string[]): IObjectOfStings;
export declare function validateExpectedVariables<Obj extends IEnvOptionsObject>(variables: Obj): void;
export declare function finalTypesMatch(value: string | number | boolean, expectedVariable: IEnvOption | true): boolean;
export declare function joinArray(arr: (string | number | boolean)[]): string;