/// <reference types="node" />
import { ConfigurationProperties } from '@zetapush/core';
export declare class EnvironmentVariablesConfigurationProperties implements ConfigurationProperties {
    private env;
    constructor(env?: NodeJS.ProcessEnv);
    has(key: string): boolean;
    get<T>(key: string): T | null;
    get<T>(key: string, defaultValue: T): T;
    getOrThrow<T, E extends Error>(key: string, error?: E): T;
    private convertValue;
    private convertKey;
}