import { AnyObject } from '../extensions';
interface SettingsFromOptions<T> {
    defaultValue?: T;
    isRequired?: boolean;
    transform?(value: string): T;
}
interface SettingsFrom {
    env(key: string): string;
    env<T>(key: string): T;
    env(key: string): string;
    env(key: string, options: SettingsFromOptions<string>): string;
    env<T>(key: string, options: SettingsFromOptions<T>): T;
    preset: {
        readonly mode: 'production' | 'development';
    };
}
export declare const createSettings: <TSettings extends AnyObject>(delegate: (from: SettingsFrom) => TSettings) => TSettings;
export {};