declare class FeatureFlagService {
    private db;
    private cache;
    private events;
    constructor();
    private initialize;
    private loadFeatureFlags;
    private listenForChanges;
    isEnabled(flagName: string): boolean;
    onUpdate(callback: () => void): void;
    static setDatabaseUrl(url: string): void;
}
export { FeatureFlagService };