/**
 * Environment variables interface
 */
export interface Env {
    LIVEKIT_API_KEY?: string;
    LIVEKIT_API_SECRET?: string;
    LIVEKIT_URL?: string;
    NEXT_PUBLIC_CONN_DETAILS_ENDPOINT?: string;
}
/**
 * Loads environment variables from process.env or .env file
 * In browser context, only NEXT_PUBLIC_* variables are available
 */
export declare function loadEnv(): Env;
/**
 * Utility to check if required environment variables are set
 * @param keys Array of required environment variable keys
 * @returns Boolean indicating if all variables are present
 */
export declare function checkRequiredEnv(keys: Array<keyof Env>): boolean;
/**
 * For server-side environments, this validates required environment variables
 * @param keys Array of required environment variable keys
 * @throws Error if any required variables are missing
 */
export declare function validateServerEnv(keys: Array<keyof Env>): void;