/**
 * Default Feature Manager Implementation
 */
import type { IFeatureManager } from '../../api/index.js';
import type { FeatureFlags } from '../../api/index.js';
export declare class DefaultFeatureManager implements IFeatureManager {
    private features;
    private listeners;
    constructor(initialFeatures?: FeatureFlags);
    isEnabled(key: string): boolean;
    get<T = any>(key: string, defaultValue?: T): T;
    set(key: string, value: any): void;
    enable(key: string): void;
    disable(key: string): void;
    toggle(key: string): void;
    update(updates: FeatureFlags): void;
    getAll(): Readonly<FeatureFlags>;
    has(key: string): boolean;
    subscribe(key: string, listener: (value: any) => void): () => void;
    subscribeAll(listener: (key: string, value: any) => void): () => void;
    destroy(): void;
    private notifyListeners;
}
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