export declare type UnifiedEnvReturnObject<Obj extends IEnvOptionsObject> = {
    [key in keyof Obj]: TypeFromConstructor<Obj[key] extends IEnvOption ? Obj[key]['type'] : StringConstructor>;
};
export declare type TypeFromConstructor<T> = T extends BooleanConstructor ? boolean : T extends NumberConstructor ? number : string;
export declare type UnifiedEnvErrorObject<Obj extends IEnvOptionsObject> = {
    [key in keyof Obj]: string[];
};
export declare type ValidType = StringConstructor | NumberConstructor | BooleanConstructor;
export declare type LogLevel = 'log' | 'debug' | 'info' | 'warn' | 'error';
export declare type TieBreakers = 'env' | 'argv' | 'file' | '__defaultValue';
export interface IEnvOptionsObject {
    [key: string]: IEnvOption | true;
}
export interface IEnvOption {
    required?: boolean;
    defaultValue?: string | boolean | number;
    acceptableValues?: (string | boolean | number)[];
    type?: ValidType;
    tieBreaker?: TieBreakers;
}
export interface IObjectOfStings {
    [key: string]: string;
}
export interface IUnifiedEnvOptions {
    logLevel: LogLevel;
    logger: ILogger;
}
export interface ILogger {
    log(...args: any[]): void;
    debug(...args: any[]): void;
    info(...args: any[]): void;
    warn(...args: any[]): void;
    error(...args: any[]): void;
}
export interface IFileOptions {
    filePath: string;
    encoding: string;
    failIfNotFound: boolean;
}