import { OnDestroy } from '@angular/core';
import { GrowthBook, Context, Attributes, RefreshFeaturesOptions, FeatureResult } from '@growthbook/growthbook';
import { Observable } from 'rxjs';
import { NgxGrowthbookConfiguration, TrackingService } from './ngx-growthbook.config';
import * as i0 from "@angular/core";
export { type FeatureResult, type Result } from '@growthbook/growthbook';
export declare class NgxGrowthbookService implements OnDestroy {
    private config;
    private growthBook;
    private readonly growthBookSource;
    private eventCount;
    private readonly destroy$;
    constructor(config: NgxGrowthbookConfiguration);
    ngOnDestroy(): void;
    init(config: Context, trackingService?: TrackingService | null): Promise<GrowthBook<Record<string, any>>>;
    triggerUpdate(): void;
    subscribe(callback: (n: number) => void): import("rxjs").Subscription;
    getFeature<T>(featureKey: string, defaultValue?: T): FeatureResult<T>;
    /**
     * Evaluates a feature and returns an observable that will emit whenever the feature changes
     * @param featureKey The feature key to evaluate
     * @param defaultValue The default value if the feature is not found
     */
    evaluateFeature<T>(featureKey: string, defaultValue?: T): Observable<FeatureResult<T>>;
    /**
     * Evaluates a feature and returns the current value synchronously
     * @param featureKey The feature key to evaluate
     * @param defaultValue The default value if the feature is not found
     */
    evaluateFeatureSync<T>(featureKey: string, defaultValue?: T): FeatureResult<T>;
    loadFeatures(): Promise<void>;
    isOn(featureKey: string): boolean;
    isOff(featureKey: string): boolean;
    setFeatureValue(featureKey: string): void;
    getFeatureValue(featureKey: string, defaultValue: any): any;
    /**
     * In addition to the isOn and getFeatureValue helper methods,
     * there is the evalFeature method that gives you more detailed
     * information about why the value was assigned to the user.
     * @param featureKey
     * @returns
     */
    evalFeature(featureKey: string): FeatureResult<any>;
    /**
     * Completely replaces attributes
     * @param attributes
     */
    setAttributes(attributes: Attributes): Promise<void>;
    updateAttributes(attributes: Attributes): Promise<void>;
    refreshFeatures(options?: RefreshFeaturesOptions): Promise<void>;
    setURL(url: string): Promise<void>;
    getAttributes(): {
        [x: string]: any;
    };
    getFeatures(): Record<string, import("@growthbook/growthbook").FeatureDefinition<any>>;
    getExperiments(): import("@growthbook/growthbook").AutoExperiment<import("@growthbook/growthbook").AutoExperimentVariation>[];
    static ɵfac: i0.ɵɵFactoryDeclaration<NgxGrowthbookService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NgxGrowthbookService>;
}