/**
 * Validated environment configuration
 */
export interface ValidatedEnv {
    readonly NEWO_BASE_URL: string;
    readonly NEWO_PROJECT_ID: string | undefined;
    readonly NEWO_API_KEY: string | undefined;
    readonly NEWO_API_KEYS: string | undefined;
    readonly NEWO_ACCESS_TOKEN: string | undefined;
    readonly NEWO_REFRESH_TOKEN: string | undefined;
    readonly NEWO_REFRESH_URL: string | undefined;
    readonly NEWO_DEFAULT_CUSTOMER: string | undefined;
    readonly NEWO_FORMAT: string | undefined;
    readonly [key: string]: string | undefined;
}
/**
 * Environment validation errors with clear messaging
 */
export declare class EnvValidationError extends Error {
    constructor(message: string);
}
/**
 * Validates required environment variables and returns typed configuration
 */
export declare function validateEnvironment(): ValidatedEnv;
/**
 * Global validated environment - call validateEnvironment() once at startup
 */
export declare let ENV: ValidatedEnv;
/**
 * Initialize environment validation - must be called at application startup
 */
export declare function initializeEnvironment(): ValidatedEnv;
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