/**
 * @rajeev02/app-shell — Feature Flags & Remote Config
 * A/B testing, gradual rollout, kill switch, remote configuration
 */
export interface FeatureFlag {
    key: string;
    enabled: boolean;
    rolloutPercent?: number;
    segments?: string[];
    variant?: string;
    metadata?: Record<string, unknown>;
}
export declare class FeatureFlagManager {
    private flags;
    private config;
    private userId;
    /** Load flags from server response */
    loadFlags(flags: FeatureFlag[]): void;
    /** Load remote config */
    loadConfig(config: Record<string, unknown>): void;
    /** Check if feature is enabled */
    isEnabled(key: string): boolean;
    /** Get A/B variant */
    getVariant(key: string): string | null;
    /** Get config value */
    getConfig<T = unknown>(key: string, defaultValue: T): T;
    /** Set user ID for consistent rollout */
    setUserId(userId: string): void;
    /** Get all flags */
    getAllFlags(): FeatureFlag[];
    private hashUser;
}
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