import { HttpClient } from '@angular/common/http';
import { AnalyticsService } from './firebase/analytics.service';
import * as i0 from "@angular/core";
export interface UserFeature {
    key: string;
    enabled: boolean;
    rolloutPercentage?: number;
    rolloutHash?: string;
}
export declare class FeatureControlService {
    private http;
    private analytics?;
    private features;
    private isLoaded;
    private previousState;
    constructor(http: HttpClient, analytics?: AnalyticsService);
    private logFeatureEvent;
    /**
     * Load user features from backend.
     * Call this during app initialization (AppComponent ctor or effect).
     * Logs feature state changes to Firebase Analytics.
     */
    loadUserFeatures(): Promise<void>;
    /**
     * Check if a feature is enabled for the current user.
     * Returns true if feature is not found (optimistic default).
     * If rollout percentage is set, uses consistent hashing for canary rollouts.
     */
    isEnabled(featureKey: string): boolean;
    /**
     * Get a computed signal for a feature.
     * Use in templates: *ngIf="featureEnabled('oauth_facebook')()"
     * Or in component: featureEnabled('payment_settings').
     */
    featureEnabled(featureKey: string): () => boolean;
    /**
     * Get all features for debugging (admin only).
     */
    getAllFeatures(): Map<string, boolean>;
    /**
     * Check if features have been loaded.
     */
    isReady(): boolean;
    /**
     * Watch for feature changes (for testing/demo purposes).
     */
    watchFeatures(): import("@angular/core").WritableSignal<Map<string, boolean>>;
    static ɵfac: i0.ɵɵFactoryDeclaration<FeatureControlService, [null, { optional: true; }]>;
    static ɵprov: i0.ɵɵInjectableDeclaration<FeatureControlService>;
}