/**
 * Simple environment variable loader for browser-based examples
 * In production, use proper environment variable handling
 */
export interface EnvConfig {
    DEEPL_API_KEY?: string;
    GOOGLE_CLOUD_API_KEY?: string;
    CUSTOM_TRANSLATION_ENDPOINT?: string;
    DEFAULT_LANGUAGE?: string;
    AUTO_TRANSLATE?: boolean;
    PRESERVE_ORIGINAL_TEXT?: boolean;
}
export declare function loadEnvConfig(): EnvConfig;
export declare function saveEnvConfig(config: Partial<EnvConfig>): void;
export declare function getApiKey(provider: string): string | undefined;
export declare function getTranslationApiConfig(provider: string): {
    provider: "deepl";
    apiKey: string | undefined;
    endpoint?: undefined;
} | {
    provider: "google-cloud";
    apiKey: string | undefined;
    endpoint?: undefined;
} | {
    provider: "custom";
    endpoint: string | undefined;
    apiKey?: undefined;
} | null;
export declare function hasValidApiConfig(): boolean;