export interface MergeOptions {
    concatArrays?: boolean;
    overwrite?: boolean;
}

export interface ConfigSettings {}

export interface ConfigSettingsPath {
    rootPath: string;
    baseName?: string;
}
export interface EnvConfigSettings<TSettings = {}> {
    base: Partial<TSettings>;
    // tslint:disable-next-line: variable-name
    nodeEnv?: { [node_env: string]: Partial<TSettings> };
    // tslint:disable-next-line: no-any
    envVars?: any;
}

export type ConfigSettingsTypes<TSettings extends ConfigSettings = ConfigSettings> =
    | Partial<TSettings>
    | EnvConfigSettings<TSettings>
    | ConfigSettingsPath;

export type ConfigSettingsArg<TSettings extends ConfigSettings = ConfigSettings> =
    | ConfigSettingsTypes<TSettings>
    | (() => ConfigSettingsTypes<TSettings>)
    | (() => Promise<ConfigSettingsTypes<TSettings>>);

export type ConfigSettingsArgs<TSettings extends ConfigSettings = ConfigSettings> =
    | ConfigSettingsArg<TSettings>
    | Array<ConfigSettingsArg<TSettings>>;