export type AppConfig = {
    server: {
        port: number;
    };
    security: {
        jwt: {
            secret: string | null;
            audience?: string | null;
            issuer?: string | null;
        };
        encryption: {
            cacheKeyBase64: string | null;
        };
    };
    rateLimit: {
        windowMs: number;
        max: number;
    };
};
export declare function loadConfig(): AppConfig;
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