export interface MergeOptions {
    concatArrays?: boolean;
    overwrite?: boolean;
}
export interface ConfigSettings {
}
export interface ConfigSettingsPath {
    rootPath: string;
    baseName?: string;
}
export interface EnvConfigSettings<TSettings = {}> {
    base: Partial<TSettings>;
    nodeEnv?: {
        [node_env: string]: Partial<TSettings>;
    };
    envVars?: any;
}
export declare type ConfigSettingsTypes<TSettings extends ConfigSettings = ConfigSettings> = Partial<TSettings> | EnvConfigSettings<TSettings> | ConfigSettingsPath;
export declare type ConfigSettingsArg<TSettings extends ConfigSettings = ConfigSettings> = ConfigSettingsTypes<TSettings> | (() => ConfigSettingsTypes<TSettings>) | (() => Promise<ConfigSettingsTypes<TSettings>>);
export declare type ConfigSettingsArgs<TSettings extends ConfigSettings = ConfigSettings> = ConfigSettingsArg<TSettings> | Array<ConfigSettingsArg<TSettings>>;